CUET UG Economics Booster Test 2 - Sustainable Practices and Alternative Energy Resources -

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CUET UG Economics Booster Test 2 - Sustainable Practices and Alternative Energy Resources

⏱️ 30 Minutes

❓ 20 Questions

📌 Answers are locked once submitted — results and explanations appear at the end.

CUET UG Economics Booster Test 2 - Sustainable Practices and Alternative Energy Resources

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QUESTION 1 OF 20

What are considered non-conventional sources of energy that can help mitigate adverse environmental impacts?

Answer Review

1 What are considered non-conventional sources of energy that can help mitigate adverse environmental impacts?

A Wind power and solar rays

B Coal and natural gas

C Thermal power

D Fossil fuels

💡 Short Explanation

Conventional energy sources rely heavily on fossil fuels, which release significant greenhouse gases and pollutants. Non-conventional sources harness naturally recurring elements to generate electricity. Wind power and solar rays are clean, non-conventional alternatives that mitigate environmental harm.

✅ Correct Answer Explanation

Non-conventional energy sources capture naturally replenishing forces like moving air currents and solar radiation. Unlike fossil fuels, transforming wind and sunlight into power produces zero greenhouse gas emissions or toxic particulate waste during generation, making Option A the correct choice.

❓ Why Other Options Are Incorrect

Option B → Incorrect because coal and natural gas are conventional fossil fuels that release large volumes of carbon dioxide ($CO_2$) when burned.
Option C → Incorrect because thermal power typically relies on burning coal or gas, which causes air pollution.
Option D → Incorrect because fossil fuels are finite, conventional resources that drive climate change and environmental degradation.

🎯 Strategy

Used: Contextual Matching

Application: Identify the option containing energy sources that do not rely on burning finite, carbon-heavy materials.

Final Logic: Wind and solar power match the criteria for clean, non-conventional alternatives (Option A).

🧠 Memory Trick

Non-conventional = Clean & Continuous (Wind & Solar).

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Non-Conventional Energy Sources

2 Fill in the blank: ______ resources are those which can be used without the possibility of the resource becoming depleted or exhausted, such as trees in the forests.

A Renewable

B Non-renewable

C Conventional

D Extinct

💡 Short Explanation

Resources that naturally replenish themselves over time are classified based on their continuous replacement cycle. If harvested at a sustainable rate, these assets do not run out. These are defined as renewable resources.

✅ Correct Answer Explanation

Renewable resources are supported by natural ecological cycles that continually restock them (such as biomass growth or water cycles). As long as the rate of human extraction stays within the natural rate of regeneration, these assets can be used indefinitely without being exhausted, aligning with Option A.

❓ Why Other Options Are Incorrect

Option B → Incorrect because non-renewable resources exist in fixed amounts and are permanently depleted when consumed.
Option C → Incorrect because conventional refers to traditional commercial energy pathways rather than a resource's natural replenishment cycle.
Option D → Incorrect because extinct refers to biological species that have completely died out, not an economic resource classification.

🎯 Strategy

Used: Definition Matching

Application: Match the description of a resource that naturally replenishes itself with its formal economic term.

Final Logic: This capacity for natural renewal defines a renewable resource (Option A).

🧠 Memory Trick

Renewable = Can renew itself.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Classification of Natural Resources

3 In rural areas, the provision of subsidised Liquefied Petroleum Gas (LPG) primarily aims to achieve which of the following?

A Increase the use of chemical fertilisers

B Reduce household air pollution and energy wastage

C Promote shifting cultivation

D Generate electricity locally

💡 Short Explanation

Traditional rural cooking relies heavily on burning biomass fuels like firewood and dried cattle dung. Burning these fuels releases thick smoke into homes, causing severe indoor air pollution and wasting thermal energy. Shifting households to subsidised LPG provides a cleaner fuel that reduces indoor air pollution and improves energy efficiency.

✅ Correct Answer Explanation

Traditional biomass fuels release high amounts of particulate matter and carbon monoxide inside rural homes. Providing subsidised LPG gives families a clean-burning fuel that lowers indoor air pollution and respiratory illnesses while cutting down on energy waste, matching Option B.

❓ Why Other Options Are Incorrect

Option A → Incorrect because LPG is a pressurized cooking fuel and has no connection to agricultural soil fertilizers.
Option C → Incorrect because shifting cultivation is a farming method, whereas LPG is used for domestic cooking.
Option D → Incorrect because domestic LPG cylinders are used directly for cooking heat rather than generating village electricity.

🎯 Strategy

Used: Elimination

Application: Look at the primary function of the resource. LPG is a household cooking fuel, so its main benefits will be related to domestic energy use and health.

Final Logic: This filters out options A, C, and D, leaving Option B as the correct answer.

🧠 Memory Trick

LPG = Less Pollution & Gas cooking.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Rural Energy Transition

4 Which of the following is left over from a gobar gas plant and serves as an excellent organic fertiliser and soil conditioner?

A Methane emissions

B Photovoltaic cells

C Cattle dung slurry

D Biomass wood

💡 Short Explanation

Gobar gas plants process animal waste through anaerobic digestion to generate biogas. During this process, the energy-rich methane gas is drawn off for cooking or lighting. The remaining nutrient-dense material, known as cattle dung slurry, can be spread on fields as an organic fertilizer.

✅ Correct Answer Explanation

Inside a biogas digester, bacteria break down animal waste to produce methane gas. This anaerobic process leaves behind a nutrient-rich cattle dung slurry containing concentrated nitrogen, phosphorus, and potassium. This byproduct can be returned to fields as an organic fertilizer that restores soil structure, matching Option C.

❓ Why Other Options Are Incorrect

Option A → Incorrect because methane is the volatile gas captured for fuel use, not a solid byproduct left behind for fields.
Option B → Incorrect because photovoltaic cells are electronic components used to manufacture solar panels.
Option C → Incorrect because biomass wood refers to raw fuel timber rather than a processed slurry byproduct.

🎯 Strategy

Used: Contextual Matching

Application: Identify the specific nutrient-rich byproduct left behind after biogas has been extracted from animal waste.

Final Logic: This agricultural byproduct is the processed cattle dung slurry (Option C).

🧠 Memory Trick

Slurry = Soil nutrients.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Biogas and Organic Farming Inputs

5 The use of Compressed Natural Gas (CNG) as fuel in public transport systems has significantly ________ in cities like Delhi.

A Increased greenhouse emissions

B Increased the use of coal

C Lowered water contamination

D Lowered air pollution and made the air cleaner

💡 Short Explanation

Diesel and petrol engines release high amounts of sulfur dioxide, nitrogen oxides, and particulate matter ($PM_{2.5}$). Compressed Natural Gas (CNG) burns much cleaner than these traditional liquid fuels. Switching public transit fleets to CNG helps lower air pollution and improve urban air quality.

✅ Correct Answer Explanation

Upgrading public transit fleets from diesel to CNG reduces the amount of particulate matter and harmful chemicals released from tailpipes. In major cities like Delhi, this policy has significantly reduced urban air pollution and improved air quality, matching Option D.

❓ Why Other Options Are Incorrect

Option A → Incorrect because CNG burns cleaner than diesel, reducing the amount of air pollution released per mile.
Option B → Incorrect because CNG is used as a vehicle fuel and does not increase the amount of coal burned in power plants.
Option C → Incorrect because shifting vehicle fuels directly improves air quality rather than targeting water treatment systems.

🎯 Strategy

Used: Contextual Matching

Application: Identify the main environmental benefit that comes from switching city buses and auto-rickshows from diesel to cleaner CNG.

Final Logic: This policy directly addresses urban smog by lowering tailpipe emissions and cleaning the air (Option D).

🧠 Memory Trick

CNG = Cleaner Natural Gas = Cleaner Air.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Urban Air Quality Interventions

6 Which of the following statements about cleaner transport strategies in Delhi are correct?
Statement I: Delhi adopted the odd/even scheme for private vehicles.
Statement II: Public transport vehicles use CNG instead of petrol or diesel.

A Only Statement I is correct

B Only Statement II is correct

C Both Statements I and II are correct

D Neither Statement I nor II is correct

💡 Short Explanation

Statement I is correct because Delhi introduced the odd/even traffic rule to restrict private vehicle use and reduce peak road congestion. Statement II is correct because the city mandated that its public transport fleet run on clean-burning Compressed Natural Gas (CNG). Since both statements describe active urban transport strategies used in Delhi, Option C is correct.

✅ Correct Answer Explanation

Both statements describe complementary urban transport policies. Statement I is correct because the odd/even license plate scheme was used to manage traffic volume and lower vehicle emissions on high-pollution days. Statement II is correct because mandating CNG for buses and auto-rickshaws created a cleaner public transit fleet. Therefore, both statements are correct, matching Option C.

❓ Why Other Options Are Incorrect

Option A → Incorrect because it leaves out Statement II, which describes the city's important shift to a CNG-powered public transport fleet.
Option B → Incorrect because it overlooks Statement I, which describes the traffic management rules applied to private vehicles.
Option D → Incorrect because it wrongly labels both active, documented urban transport policies as incorrect.

🎯 Strategy

Used: Logic Integration

Application: Evaluate both traffic management and fuel replacement policies used to address urban air pollution.

Final Logic: Both the odd/even traffic rules and the shift to CNG fuel are verified parts of the city's environmental strategy, leading directly to Option C.

🧠 Memory Trick

Odd/Even regulates traffic numbers + CNG cleans up the fuel = Both improve urban air quality.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Case Studies in Urban Emission Control

7 How do wind turbines fundamentally function to create energy?

A They run on fossil fuels

B They convert solar rays into mechanical power

C They use cattle dung to generate wind

D They move with the wind and electricity is generated

💡 Short Explanation

Wind contains kinetic energy generated by natural atmospheric movement. As wind passes over a turbine's curved blades, it forces them to rotate around a central rotor. This rotational movement turns an internal generator that converts kinetic energy into electricity.

✅ Correct Answer Explanation

Wind turbines capture the kinetic energy of moving air currents. When wind blows against the blades, it spins a central rotor connected to an internal generator. This generator transforms the mechanical rotation into electrical energy without burning fuel or releasing emissions, matching Option D.

❓ Why Other Options Are Incorrect

Option A → Incorrect because wind turbines rely entirely on moving air currents and do not burn fossil fuels.
Option B → Incorrect because transforming solar rays into power describes the function of solar photovoltaic cells.
Option C → Incorrect because cattle dung is processed in anaerobic biogas digesters rather than being used to spin wind turbines.

🎯 Strategy

Used: Functional Matching

Application: Match the physical resource (moving air currents) with the mechanical process used to generate electricity.

Final Logic: Wind turbines use moving air to spin a generator that creates electricity, leading directly to Option D.

🧠 Memory Trick

Wind blows > Blades turn > Generator spins > Electricity is made.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Wind Energy Mechanics

8 Arrange the following steps of wind power electricity generation in a logical sequence:
1. Wind speed turns the turbine blades
2. An area where the speed of wind is usually high is identified
3. Wind mills/turbines are installed despite high initial costs
4. Electricity is generated without adverse environmental impacts

A 1, 2, 3, 4

B 2, 3, 1, 4

C 3, 2, 4, 1

D 4, 3, 2, 1

💡 Short Explanation

Developing a wind power project follows a practical engineering sequence from site selection to energy generation. First, engineers survey regions to identify areas with consistently high wind speeds (2). Next, crews build the project by installing turbines at the selected site (3). Once operational, passing wind turns the turbine blades (1). This rotation drives the generator, and electricity is generated cleanly (4).

✅ Correct Answer Explanation

Setting up a wind energy project requires a logical step-by-step engineering process: 1. Site assessment: An area where the speed of wind is usually high is identified (2). 2. Construction phase: Wind mills/turbines are installed despite high initial costs (3). 3. Mechanical operation: Wind speed turns the turbine blades (1). 4. Power output: Electricity is generated without adverse environmental impacts (4). This sequence yields 2, 3, 1, 4, which matches Option B.

❓ Why Other Options Are Incorrect

Option A → Incorrect because it shows turbines spinning (1) before a high-wind site has been identified (2) or built (3).
Option C → Incorrect because it lists constructing expensive turbines (3) before conducting wind speed surveys to find a suitable site (2).
Option D → Incorrect because it reverses the sequence, showing electricity being generated (4) before the turbines are installed or site surveys take place.

🎯 Strategy

Used: Sequence Analysis

Application: Identify the necessary first step: you must locate a high-wind area (2) before you can build a wind project.

Final Logic: Since step 2 must come first, Option B is the only choice that fits the proper project sequence ($2 > 3 > 1 > 4$).

🧠 Memory Trick

Find Wind (2) > Build Turbines (3) > Blades Turn (1) > Power Generated (4).

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Developing Non-Conventional Energy Projects

9 What is the primary function of photovoltaic cells in solar energy production?

A To absorb ultraviolet radiation from the ozone layer

B To capture solar energy and convert it into electricity

C To convert cattle dung into fuel

D To reduce ground-level vehicular emissions

💡 Short Explanation

Solar energy travels to Earth as electromagnetic radiation and light photons. Photovoltaic panels are made using specialized semiconductor materials like silicon. These cells absorb light photons and convert them directly into electricity.

✅ Correct Answer Explanation

Photovoltaic (PV) cells are manufactured using semiconductor materials. When photons from sunlight strike these cells, they knock electrons loose from their atoms, creating a flow of direct current (DC) electricity. This process converts solar energy directly into usable electrical power, matching Option B.

❓ Why Other Options Are Incorrect

Option A → Incorrect because the ozone layer naturally absorbs solar ultraviolet radiation high in the atmosphere, which is different from how solar panels work on the ground.
Option C → Incorrect because converting livestock waste into methane gas describes the function of a biogas digester.
Option D → Incorrect because solar panels generate clean electricity but do not interact directly with vehicle exhaust systems to filter tailpipe emissions.

🎯 Strategy

Used: Functional Matching

Application: Match the electronic component (photovoltaic cell) with its specific energy-conversion function.

Final Logic: Photovoltaic cells turn sunlight into electricity, leading directly to Option B.

🧠 Memory Trick

Photo = Light; Voltaic = Electricity.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Solar Photovoltaic Systems

10 Match the solar applications with their everyday or natural use:

List I	List II
1. Sunlight	a. Use solar energy to perform photosynthesis
2. Plants	b. Convert energy to electricity
3. Photovoltaic cells	c. Used naturally to dry clothes and grains
4. Remote areas	d. Benefit greatly from off-grid solar technology

A 1-c, 2-a, 3-b, 4-d

B 1-a, 2-b, 3-c, 4-d

C 1-d, 2-c, 3-b, 4-a

D 1-b, 2-d, 3-a, 4-c

💡 Short Explanation

Sunlight provides natural heat that communities use to dry clothes and grains (1 > c). Plants absorb solar energy to power photosynthesis and grow (2 > a). Photovoltaic cells use semiconductor materials to convert solar energy into electricity (3 > b). Remote areas benefit from off-grid solar panels that provide power without expensive grid lines (4 > d).

✅ Correct Answer Explanation

Let's pair each term with its correct application description: Sunlight functions as a natural heat source used naturally to dry clothes and grains (1-c). Plants act as biological solar collectors that use solar energy to perform photosynthesis (2-a). Photovoltaic cells are electronic devices built to convert energy to electricity (3-b). Remote areas lack central power lines and benefit greatly from off-grid solar technology (4-d). This complete set matches Option A.

❓ Why Other Options Are Incorrect

Option B → Incorrect because it pairs raw sunlight directly with biological photosynthesis while mixing up industrial drying uses (1-a, 3-c).
Option C → Incorrect because it connects raw sunlight with off-grid mountain community networks (1-d).
Option D → Incorrect because it suggests raw sunlight functions primarily as an electronic voltage generator (1-b).

🎯 Strategy

Used: Option Grouping

Application: Start with the most practical, traditional use: Sunlight is used naturally to dry clothes and grains (1-c).

Final Logic: Looking at the choices, only Option A pairs 1 with c, confirming the correct matching sequence.

🧠 Memory Trick

Sunlight dries grain (1 to c); Plants do photosynthesis (2 to a); PV cells make power (3 to b).

📚 BATCH 2: QUESTIONS 11–20

11 Mini-hydel plants primarily use the energy of which natural resource to move small turbines?

A Ocean tides

B Compressed natural gas

C Perennial streams in mountainous regions

D Groundwater aquifers

💡 Short Explanation

Large hydroelectric dams flood valleys and disrupt river ecosystems. Mini-hydel plants avoid these issues by using the natural flow of local waterways. They capture kinetic energy from perennial streams in mountainous regions to spin small turbines.

✅ Correct Answer Explanation

Mini-hydel installations are run-of-the-river systems that do not require building massive reservoirs. Instead, they divert a portion of the water from perennial mountain streams through a pipe to spin small turbines, generating clean electricity for local communities before returning the water to the stream, matching Option C.

❓ Why Other Options Are Incorrect

Option A → Incorrect because capturing energy from ocean tides requires large coastal barrages rather than small mountain turbine installations.
Option B → Incorrect because Compressed Natural Gas is a fossil fuel burned in combustion engines, not a water source used to spin hydro turbines.
Option D → Incorrect because groundwater aquifers are underground water reserves that lack the surface flow needed to spin turbines.

🎯 Strategy

Used: Contextual Matching

Application: Identify the specific flowing water source used to power small-scale, eco-friendly mini-hydel projects.

Final Logic: These projects are powered by the continuous flow of mountain streams (Option C).

🧠 Memory Trick

Mini-hydel = Mountain streams.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Small-Scale Hydroelectric Alternatives

12 Match the following concepts regarding local electricity from mini-hydel plants:

List I	List II
1. Mini-hydel plants	a. Met efficiently by locally generated power
2. Perennial streams	b. Provide continuous energy for turbines
3. Local demands	c. Avoided by producing power close to the source
4. Transmission loss	d. Environment-friendly power source

A 1-b, 2-c, 3-a, 4-d

B 1-c, 2-d, 3-b, 4-a

C 1-d, 2-b, 3-a, 4-c

D 1-a, 2-b, 3-c, 4-d

💡 Short Explanation

Mini-hydel plants provide an eco-friendly power source without needing large dams (1 > d). Perennial streams flow year-round, providing continuous energy to spin turbines (2 > b). Local demands are met efficiently by generating electricity right in the community (3 > a). Transmission loss is avoided by producing power close to where it is used (4 > c).

✅ Correct Answer Explanation

Let's match each concept with its correct description: Mini-hydel plants function as an environment-friendly power source (1-d) because they do not require large reservoirs. Perennial streams flow consistently throughout the year to provide continuous energy for turbines (2-b). Local demands in remote villages are met efficiently by locally generated power (3-a). Long-distance Transmission loss is avoided by producing power close to the source (4-c). This complete set matches Option C.

❓ Why Other Options Are Incorrect

Option A → Incorrect because it connects mini-hydel plants to continuous stream flows while ignoring their eco-friendly design features (1-b).
Option B → Incorrect because it suggests mini-hydel installations function primarily to solve transmission line challenges (1-c).
Option D → Incorrect because it treats mini-hydel plants as local consumption demands rather than generation systems (1-a).

🎯 Strategy

Used: Option Grouping

Application: Start with the main benefit of decentralized generation: transmitting power over short distances avoids transmission losses (4-c).

Final Logic: Looking at the choices, only Option C pairs 4 with c, confirming the correct matching sequence.

🧠 Memory Trick

Streams give continuous energy (2 to b); Local generation avoids transmission loss (4 to c).

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Benefits of Decentralized Energy Systems

13 Traditionally, how have Indian people interacted with their environment?

A As absolute controllers of the environment

B Through heavy reliance on chemical fertilisers

C Being unaware of the medical properties of plants

D As a component of the environment and not its controller

💡 Short Explanation

Traditional Indian cultural practices emphasize living in harmony with nature rather than exploiting it. This perspective treats human society as one interconnected part of a larger ecosystem. Therefore, humans act as a component of the environment and not its controller.

✅ Correct Answer Explanation

Traditional Indian practices view human life as interconnected with nature. This cultural perspective treats humans as a component of the environment rather than its absolute controller. This worldview encourages conservation and helped shape traditional farming, forestry, and healthcare practices, matching Option D.

❓ Why Other Options Are Incorrect

Option A → Incorrect because treating humans as absolute controllers of nature leads to exploitative practices that cause environmental damage.
Option B → Incorrect because traditional farming relied on organic inputs like compost and manure long before synthetic fertilizers were invented.
Option C → Incorrect because systems like Ayurveda show that Indian culture has a deep, long-standing understanding of medicinal plants.

🎯 Strategy

Used: Contextual Matching

Application: Identify the option that reflects traditional environmental values of balance and conservation.

Final Logic: This perspective treats humans as a piece of the ecosystem rather than its master, pointing directly to Option D.

🧠 Memory Trick

Traditional view = Part of nature, not its master.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Traditional Knowledge and Practices

14 India is very privileged to have approximately 'X' species of plants with medicinal properties, out of which 'Y' are in regular use in systems like Ayurveda. Identify the correct numerical values.

A X = 15,000, Y = 8,000

B X = 10,000, Y = 5,000

C X = 20,000, Y = 1,000

D X = 8,000, Y = 15,000

💡 Short Explanation

India possesses high biodiversity, including a wide variety of flora used in traditional medicine. Standard data shows the country has roughly 15,000 documented species with medicinal properties. Traditional healthcare systems like Ayurveda regularly use about 8,000 of these species.

✅ Correct Answer Explanation

India's diverse ecosystems are home to approximately 15,000 plant species with documented medicinal properties. Traditional healthcare systems—including Ayurveda, Unani, and Siddha—regularly use around 8,000 of these species to produce traditional remedies, matching the data in Option A.

❓ Why Other Options Are Incorrect

Option B → Incorrect because 10,000 understates the total number of medicinal species found across the country.
Option C → Incorrect because listing only 1,000 species ignores thousands of plants regularly used in traditional Ayurvedic treatments.
Option D → Incorrect because it reverses the data points, which incorrectly suggests the number of plants in regular use is higher than the total number available.

🎯 Strategy

Used: Data Verification

Application: Review the documented figures for Indian medicinal plants. The total number of medicinal species is 15,000, with 8,000 in regular use.

Final Logic: This specific dataset matches the values in Option A ($X = 15,000; Y = 8,000$).

🧠 Memory Trick

Total available is 15k; regular use is 8k.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Medicinal Plant Wealth and Traditional Healthcare Systems

15 Biocomposting refers to the agricultural practice of:

A Applying heavy chemical fertilisers to soil

B Using compost made from organic wastes of different types

C Burning fossil fuels for large-scale agriculture

D Isolating biopesticides from neem leaves

💡 Short Explanation

Synthetic chemical fertilizers can degrade soil health and contaminate groundwater over time. Biocomposting uses natural decomposition to turn organic waste into nutrient-rich fertilizer. This means recycling various organic wastes into usable compost.

✅ Correct Answer Explanation

Biocomposting utilizes earthworms, bacteria, and fungi to break down organic matter like crop residue, livestock manure, and food waste. This process creates a nutrient-rich humus that improves soil fertility, helps retain moisture, and reduces the need for synthetic chemical inputs, matching Option B.

❓ Why Other Options Are Incorrect

Option A → Incorrect because biocomposting is an organic farming method used to replace synthetic chemical fertilizers.
Option C → Incorrect because burning fossil fuels runs counter to the environmental goals of sustainable agriculture.
Option D → Incorrect because extracting pest-control chemicals from neem leaves describes the process of making biopesticides rather than creating compost.

🎯 Strategy

Used: Definition Matching

Application: Match the agricultural term (biocomposting) with its practical farming description.

Final Logic: Composting focuses on breaking down organic waste to enrich fields, leading directly to Option B.

🧠 Memory Trick

Bio + Compost = Decomposing organic waste for fields.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Biocomposting and Soil Health

16 The use of earthworms in agriculture is beneficial because it __________.

A Causes soil erosion

B Contaminates ground water

C Demands more chemical fertilisers

D Converts organic matter into compost faster than normal processes

💡 Short Explanation

Earthworms digest decomposing plant material and aerate the ground as they burrow. In organic farming, this process is called vermicomposting. This biological activity breaks down organic matter into high-quality compost much faster than normal processes.

✅ Correct Answer Explanation

Earthworms speed up decomposition by consuming organic waste and passing it through their digestive systems, creating nutrient-rich castings. This biological process transforms raw organic matter into high-quality compost much faster than standard decomposition, matching Option D.

❓ Why Other Options Are Incorrect

Option A → Incorrect because earthworms improve soil structure and root systems, which helps prevent soil erosion.
Option B → Incorrect because earthworms organic matter naturally, which avoids the groundwater contamination risks linked to synthetic chemicals.
Option C → Incorrect because using vermicompost enriches fields naturally, reducing the need for chemical fertilizers.

🎯 Strategy

Used: Contextual Matching

Application: Identify the main benefit of using earthworms (vermicomposting) in organic farming.

Final Logic: Earthworms accelerate the composting process to create nutrient-rich fertilizer, pointing directly to Option D.

🧠 Memory Trick

Earthworms = Faster composting.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Vermicomposting Systems

17 Neem trees are proving to be quite useful in sustainable agriculture because:

A Pest controlling chemicals have been isolated from them

B They provide high quantities of commercial timber

C They require heavy chemical fertilisers to grow

D They naturally deplete ground water

💡 Short Explanation

Synthetic chemical pesticides can leave toxic residues on crops and harm beneficial insects. Neem seeds and leaves contain natural compounds like azadirachtin that repel harmful insects. This allows farmers to create effective biopesticides that protect crops without toxic side effects.

✅ Correct Answer Explanation

Neem tree extracts contain natural chemical compounds that disrupt the feeding and reproduction of destructive insects without harming birds or larger animals. This makes neem an effective, non-toxic biopesticide for sustainable crop protection, matching Option A.

❓ Why Other Options Are Incorrect

Option B → Incorrect because while neem wood is usable, its primary value in sustainable farming is pest control rather than commercial logging.
Option C → Incorrect because neem trees are hardy and grow well in poor soils without needing synthetic chemical fertilizers.
Option D → Incorrect because neem trees have deep root systems that tolerate drought without depleting groundwater reserves.

🎯 Strategy

Used: Contextual Matching

Application: Identify the primary reason neem trees are highly valued in organic and sustainable farming.

Final Logic: Neem extracts serve as safe, natural alternatives to toxic chemical pesticides, leading directly to Option A.

🧠 Memory Trick

Neem = Natural pest control.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Biopesticides and Natural Crop Protection

18 Which of the following is an example of using natural predators for agricultural pest control?

A Spraying chlorofluorocarbons on cash crops

B Allowing birds like owls and peacocks to dwell around fields to clear insects

C Using synthetic chemical pesticides

D Felling trees near water sources

💡 Short Explanation

Chemical pesticides can kill beneficial insects alongside pests, disrupting the local food chain. Biological pest control relies on natural food webs to manage pest populations. For example, encouraging birds like owls and peacocks to live near fields helps control rodents and insects naturally.

✅ Correct Answer Explanation

Biological pest control works by maintaining a balanced ecosystem where natural predators manage pest populations. Allowing insect-eating birds like owls, peacocks, and sparrows to nest near fields creates a natural check on pests, reducing the need for chemical sprays, matching Option B.

❓ Why Other Options Are Incorrect

Option A → Incorrect because chlorofluorocarbons (CFCs) are ozone-depleting gases used in refrigeration, not crop sprays.
Option C → Incorrect because synthetic chemical pesticides are artificial poisons rather than biological predators.
Option D → Incorrect because clearing trees near waterways destroys habitats and increases soil erosion, harming the local ecosystem.

🎯 Strategy

Used: Definition Matching

Application: Find the option that uses biological relationships and natural food chains to control farm pests.

Final Logic: Encouraging insect-eating birds to hunt in fields relies on natural predators for pest control (Option B).

🧠 Memory Trick

Natural Predators = Insect-eating birds.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Biological Pest Control Methods

📄 Passage

"Economic development, which aimed at increasing the production of goods and services to meet the needs of a rising population, puts greater pressure on the environment. Sustainable development aims at promoting the kind of development that minimises environmental problems and meets the needs of the present generation without compromising the ability of the future generation to meet their own needs."

Based on the passage, the primary goal of sustainable development for environmental protection is to:

A Stop all economic development entirely

B Maximize the use of chemical fertilisers

C Minimise environmental problems while meeting current needs

D Increase the pressure on finite natural resources

💡 Short Explanation

This is a text-retrieval question based on the provided passage. The text contrasts traditional economic growth with sustainable models. It states sustainable development aims to minimize environmental problems while meeting current needs.

✅ Correct Answer Explanation

The second sentence of the passage defines the core goal: "Sustainable development aims at promoting the kind of development that minimises environmental problems and meets the needs of the present generation..." This direct statement matches Option C.

❓ Why Other Options Are Incorrect

Option A → Incorrect because the passage states that sustainability aims to shape the kind of development we pursue rather than stopping economic progress entirely.
Option B → Incorrect because chemical fertilizers are not mentioned in the text and can cause environmental issues.
Option C → Incorrect because increasing pressure on natural resources describes the problems caused by unconstrained economic growth, which sustainability works to fix.

🎯 Strategy

Used: Elimination

Application: Match each option with the provided text. The passage states that sustainable development works to minimize environmental problems while meeting current needs.

Final Logic: This direct text match rules out options A, B, and D, confirming Option C as the correct choice.

🧠 Memory Trick

The passage states the goal is to minimise environmental problems and meet present needs.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Core Goals of Sustainable Development (Passage Analysis)

📄 Passage

According to the passage, ensuring long-term welfare implies:

A Focusing exclusively on the present generation's needs

B Increasing the production of goods regardless of the environmental cost

C Exhausting all renewable resources as quickly as possible

D Meeting present needs without compromising the future generation's ability to meet theirs

💡 Short Explanation

This is a text-matching question based on the final sentence of the provided passage. The text defines our responsibility to those who follow us. It states we must meet current needs without compromising the ability of future generations.

✅ Correct Answer Explanation

The final clause of the passage defines our long-term responsibility: "...and meets the needs of the present generation without compromising the ability of the future generation to meet their own needs." This text points directly to Option D.

❓ Why Other Options Are Incorrect

Option A → Incorrect because focusing only on current consumption ignores our long-term responsibility to the future.
Option B → Incorrect because expanding production without considering environmental costs describes the unsustainable growth models criticized in the text.
Option C → Incorrect because rapidly consuming resources causes environmental degradation and compromises the future.

🎯 Strategy

Used: Elimination

Application: Compare each option with the final sentence of the text. The passage states we must protect the resource base for future generations.

Final Logic: This text verification rules out options A, B, and C, confirming Option D as the correct choice.

🧠 Memory Trick

The passage states we must meet present needs without compromising future generations.

📚 Class XII – Indian Economic Development – Chapter: Sustainable Economic Development – Topic: Intergenerational Responsibility (Passage Analysis)

CUET UG Economics Booster Test 2 - Sustainable Practices and Alternative Energy Resources

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