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Agriculture And Environment Quiz 27 (10 MCQs)

This set of multiple-choice questions evaluates understanding of agricultural practices, including terrace farming, nitrogen fixation, and sustainable aquaculture, and their environmental impacts. It covers concepts such as soil health, water management, and ecological management, assessing knowledge of crop rotation, nutrient depletion, and the effects of higher temperatures on agriculture.

Quiz Instructions

Select an option to see the correct answer instantly.

1. Higher temperatures can affect agriculture negatively as it

Correct Answer: Correct answer is: (A) Shorten the growing season.

Exam Relevance: AP Environmental Science, GRE Subject Test in Biology, GATE Agricultural Engineering

Difficulty: Moderate

Concept notes: Higher temperatures can negatively impact agriculture by shortening the growing season.

Common Mistakes: A common misunderstanding is that higher temperatures always lengthen the growing season, which is not true for all crops and regions.

Explanations: Higher temperatures can lead to faster plant development and earlier maturity, which can shorten the growing season. This can result in reduced crop yields and quality. Additionally, higher temperatures can increase water stress and pest pressure, further affecting crop growth and productivity.

Option Analysis:

Option A: This is correct because higher temperatures can accelerate plant growth, leading to a shorter growing season.
Option B: This is incorrect because higher temperatures generally do not lengthen the growing season; instead, they can shorten it.

2. Which of the following is a way to potentially eliminate one of the greatest threats to the world's mangrove wetlands?

Correct Answer: Correct answer is: B

Exam Relevance: AP Environmental Science, GRE Subject Test in Ecology, Conservation Biology Exams

Difficulty: Moderate

Concept notes: Mangrove wetlands face threats such as pollution, overfishing, and unsustainable aquaculture practices. Ecologically sound shrimp aquaculture can help mitigate these threats by reducing pollution and promoting sustainable use of mangrove resources.

Common Mistakes: A common misunderstanding is that all forms of aquaculture are harmful to mangroves, but ecologically sound practices can actually support mangrove conservation.

Explanations: Integrating ecologically sound shrimp aquaculture practices with mangrove management can help reduce pollution and promote sustainable use of mangrove resources. This approach can mitigate the negative impacts of traditional aquaculture, which often leads to habitat destruction and pollution. By adopting sustainable practices, the aquaculture industry can coexist with mangrove ecosystems, thereby reducing one of the greatest threats to these wetlands.

Option Analysis:

Option A: Increasing desalination does not directly address the primary threats to mangroves, such as pollution and habitat destruction.
Option B: Integrating ecologically sound shrimp aquaculture practices can reduce pollution and promote sustainable use of mangrove resources.
Option C: Constructing dams in mangroves can increase sediment load and potentially lead to further habitat destruction and pollution.
Option D: Irrigation methods are not typically used in mangrove habitats and do not address the primary threats to these ecosystems.

3. Area sown more than once in an agricultural year plus net sown area is known as:-

Correct Answer: Correct answer is: (D) Gross cropped area.

Exam Relevance: UPSC, GATE, Agricultural Science Exams

Difficulty: Moderate

Concept notes: The gross cropped area is the total area of land that is sown more than once in an agricultural year, plus the net sown area.

Common Mistakes: A common mistake is confusing net sown area with gross cropped area. The net sown area only includes the area sown once, while the gross cropped area includes both the area sown once and the area sown more than once.

Explanations: The gross cropped area is calculated by adding the net sown area to the area sown more than once in an agricultural year. This gives a comprehensive measure of the total area under cultivation, including multiple cropping.

Option Analysis:

Option A: Net sown area only includes the area sown once in an agricultural year.
Option B: Forest cover refers to the total area covered by forests and does not relate to agricultural land use.
Option C: Waste land refers to land that is not suitable for cultivation and is not included in the calculation of gross cropped area.
Option D: Gross cropped area is the correct term for the total area sown more than once plus the net sown area.

Mnemonic: Gross Cropped Area: "GCA" - "G" for "Gross", "C" for "Cropped", "A" for "Area".

4. Which sector uses the most water around the world?

Correct Answer: Correct answer is: (C) Agriculture.

Exam Relevance: AP Environmental Science, GRE, GATE, Civil Service Exams

Difficulty: Moderate

Concept notes: Agriculture is the largest consumer of water globally, primarily due to irrigation needs for crops.

Common Mistakes: A common misunderstanding is that industrial or household use consumes the most water, but agriculture typically uses significantly more.

Explanations: Agriculture uses the most water globally because it requires large volumes of water for irrigation to support crop growth. Industrial and household water use, while significant, are generally much lower in comparison. Ecosystems also require water, but the water used for agriculture is often extracted from these ecosystems, making agriculture the primary consumer.

Option Analysis:

Option A: Industrial purposes use a significant amount of water, but not as much as agriculture.
Option B: Household water use is relatively small compared to agricultural water use.
Option C: Agriculture uses the most water globally due to irrigation needs.
Option D: Ecosystems require water, but the water used for agriculture often comes from these ecosystems, making agriculture the primary consumer.

Mnemonic: A for Agriculture, A for Abundant water use.

5. Farmers may leave fields unplanted or plant alternate crops to reduce:

Correct Answer: Correct answer is: (A) Nutrient depletion.

Exam Relevance: AP Environmental Science, Agricultural Science Exams, Soil Science Exams

Difficulty: Moderate

Concept notes: Farmers may leave fields unplanted or plant alternate crops to manage soil health and prevent nutrient depletion.

Common Mistakes: A common misunderstanding is that leaving fields unplanted or planting alternate crops is primarily to prevent erosion, but this is not the primary reason.

Explanations: Leaving fields unplanted or planting alternate crops can help reduce nutrient depletion. Continuous planting of the same crop can deplete specific nutrients from the soil, leading to reduced soil fertility. By leaving fields unplanted or rotating with different crops, farmers can allow the soil to recover and maintain its nutrient balance.

Option Analysis:

Option A: Correct. Nutrient depletion is a significant concern in agriculture, and leaving fields unplanted or rotating crops can help manage soil nutrients.
Option B: Incorrect. Strip mining is not directly related to agricultural practices of leaving fields unplanted or rotating crops.
Option C: Incorrect. Desertification is a broader environmental issue and not the primary reason for leaving fields unplanted or rotating crops.
Option D: Incorrect. While erosion can be a concern, the primary reason for leaving fields unplanted or rotating crops is to manage nutrient depletion.

6. Terrace farming is a method common in ..... region.

Correct Answer: Correct answer is: (B) Mountain.

Exam Relevance: Geography exams, Environmental Science exams, Agriculture exams

Difficulty: Easy

Concept notes: Terrace farming is a method used to cultivate crops on sloped land by creating a series of terraces or steps.

Common Mistakes: A common misunderstanding is that terrace farming is used in flat or coastal regions, but it is specifically designed for mountainous areas to prevent soil erosion and manage water flow.

Explanations: Terrace farming is a method commonly used in mountainous regions to cultivate crops on steep slopes. The terraces help to reduce soil erosion and manage water flow, making it easier to grow crops on otherwise challenging terrain. This method is not typically used in forests, coastal areas, or plains, as these regions do not require the same level of soil and water management.

Option Analysis:

Option A: Forests do not typically require terrace farming as they are not characterized by steep slopes.
Option B: Mountainous regions are the primary areas where terrace farming is used due to the steep slopes and need for soil and water management.
Option C: Coastal regions do not generally have the steep slopes necessary for terrace farming.
Option D: Plains are flat areas and do not require terrace farming.

7. Terraces are used on some hillsides. Why do they use terraces?

Correct Answer: Correct answer is: (Choice B) To decrease erosion.

Exam Relevance: AP Environmental Science, Geography Olympiad, Agricultural Science Exams

Difficulty: Moderate

Concept notes: Terraces are flat areas built into the side of a hill or mountain to reduce soil erosion.

Common Mistakes: A common mistake is to think terraces are used to increase erosion, which is incorrect.

Explanations: Terraces are used to decrease erosion by reducing the slope of the land and slowing down water runoff. This helps to prevent soil from being washed away, which is crucial for maintaining soil fertility and preventing landslides.

Option Analysis:

Option A: Incorrect, terraces do not increase erosion.
Option B: Correct, terraces are used to decrease erosion.
Option C: Incorrect, terraces do not stop roots from spreading.
Option D: Incorrect, terraces do not protect animals.

8. Arjun, a young farmer, is on a mission to boost the nitrogen levels in his soil. Which friendly organism should he invite to help fix nitrogen in the soil?

Correct Answer: Correct answer is: (C) Rhizobium.

Exam Relevance: NEET, JEE, GATE, UPSC

Difficulty: Easy

Concept notes: Rhizobium is a type of bacteria that forms symbiotic relationships with leguminous plants, fixing atmospheric nitrogen into a form that plants can use.

Common Mistakes: A common misunderstanding is that all fungi or plants can fix nitrogen. Only specific bacteria like Rhizobium have this capability.

Explanations: Rhizobium bacteria form nodules on the roots of leguminous plants and convert atmospheric nitrogen into ammonia, which the plants can use. This process is known as biological nitrogen fixation and is crucial for increasing soil nitrogen levels without the need for chemical fertilizers.

Option Analysis:

Option A: Mushrooms are fungi and do not fix nitrogen. They decompose organic matter and recycle nutrients but do not convert atmospheric nitrogen into a usable form for plants.
Option B: Mucor is a type of fungus and does not fix nitrogen. It is involved in the decomposition of organic matter and nutrient cycling but does not have the ability to fix atmospheric nitrogen.
Option C: Rhizobium is the correct answer because it is a nitrogen-fixing bacterium that forms symbiotic relationships with leguminous plants, enhancing soil nitrogen levels.
Option D: Cuscuta is a parasitic plant and does not fix nitrogen. It obtains nutrients from host plants and does not contribute to nitrogen fixation.

9. Algal bloom is caused by .....

Correct Answer: Correct answer is: (C) Over fertilizing farm fields.

Exam Relevance: AP Environmental Science, GATE Environmental Engineering, GRE Subject Test in Biology

Difficulty: Moderate

Concept notes: Algal blooms are caused by excessive nutrients, particularly nitrogen and phosphorus, in water bodies. These nutrients can come from various sources, but over fertilizing farm fields is a significant contributor.

Common Mistakes: A common misunderstanding is that algal blooms are primarily caused by industrial pollution or automobile emissions. While these can contribute, over fertilization from agricultural practices is a major factor.

Explanations: Over fertilizing farm fields leads to excess nutrients, particularly nitrogen and phosphorus, which can run off into nearby water bodies. These nutrients promote rapid algal growth, leading to algal blooms. Algal blooms can deplete oxygen in the water, harming aquatic life and affecting water quality.

Option Analysis:

Option A: Fossil fuel burning in power plants can contribute to water pollution, but it is not the primary cause of algal blooms.
Option B: Automobiles burning fossil fuels can release pollutants, but they are not a significant source of nutrients that cause algal blooms.
Option C: Over fertilizing farm fields leads to nutrient runoff, which is a major cause of algal blooms.
Option D: Limestone rocks in a body of water can affect water chemistry, but they do not directly cause algal blooms.

10. What is the significance of the 43% percent land under net sown area?

Correct Answer: Correct answer is: (B) It contributes majorly to food production.

Exam Relevance: UPSC, Civil Services Exam, Agricultural Science Exams

Difficulty: Moderate

Concept notes: The net sown area refers to the portion of land that is actually used for crop cultivation in a given year. This area is crucial for food production as it directly contributes to the agricultural output of a region.

Common Mistakes: A common misunderstanding is that land under net sown area is primarily used for urban or industrial development, which is incorrect. The primary purpose of this land is agricultural.

Explanations: The net sown area is a significant portion of the total land area dedicated to agriculture. Given that 43% of the land is under net sown area, it implies that a substantial part of the land is actively used for crop cultivation. This land is essential for producing food crops, which are vital for feeding the population. Therefore, the land under net sown area contributes majorly to food production.

Option Analysis:

Option A: This option is incorrect because the net sown area is primarily used for agricultural purposes, not urban development.
Option B: This option is correct because the net sown area is crucial for food production.
Option C: This option is incorrect because the net sown area is not used for industrial growth; it is used for agricultural purposes.
Option D: This option is incorrect because the land under net sown area is actively used for crop cultivation and not left uncultivated for future use.

Frequently Asked Questions

What is terrace farming and where is it commonly used?

Terrace farming is a method of cultivating crops on sloped land by creating a series of terraces. It is commonly used in mountainous regions to prevent soil erosion and manage water effectively.

How does crop rotation benefit soil health?

Crop rotation helps prevent nutrient depletion by alternating crops that have different nutrient requirements. This practice also reduces soil erosion and can control pests and diseases.

What is the impact of higher temperatures on crop yield?

Higher temperatures can affect crop yield by altering the growing season and potentially causing heat stress, which can reduce plant growth and productivity.

How does nitrogen fixation contribute to sustainable agriculture?

Nitrogen fixation, often performed by leguminous plants and Rhizobium bacteria, enriches the soil with nitrogen, reducing the need for synthetic fertilizers and promoting sustainable agricultural practices.

What is the role of ecological management in agriculture?

Ecological management in agriculture involves practices that maintain biodiversity and ecosystem health, such as integrated pest management and conservation tillage, to ensure long-term sustainability.

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