Cropping Systems & Sustainable Agriculture
Cropping Systems & Sustainable Agriculture
Introduction
Cropping systems are the backbone of productive and sustainable agriculture. They involve the sequence and combination of crops grown on a field over time to optimize yields, maintain soil fertility, and conserve natural resources. Sustainable agriculture focuses on long-term productivity while minimizing environmental degradation through practices like crop rotation, intercropping, and organic nutrient management. This blog provides 50 MCQs for students preparing for MCAER, ICAR, and other competitive exams, helping them strengthen their conceptual understanding of cropping systems and sustainability.
1. Which of the following is a key principle of sustainable agriculture?
a) Maximizing chemical inputs
b) Maintaining ecological balance
c) Continuous monocropping
d) Neglecting soil fertility
Answer: b) Maintaining ecological balance
Explanation: Sustainable agriculture emphasizes environmental protection, resource conservation, and ecological balance rather than overusing chemicals or degrading soil.
2. Intercropping is defined as:
a) Growing two or more crops simultaneously in the same field
b) Growing the same crop continuously
c) Planting crops seasonally in different fields
d) Fallowing land for a season
Answer: a) Growing two or more crops simultaneously in the same field
Explanation: Intercropping helps maximize land use efficiency, reduces pest incidence, and improves soil fertility through complementary cropping patterns.
3. Which of the following is an example of a legume-cereal intercropping system?
a) Wheat + Mustard
b) Maize + Cowpea
c) Rice + Sugarcane
d) Barley + Sunflower
Answer: b) Maize + Cowpea
Explanation: Legumes like cowpea fix atmospheric nitrogen, enriching the soil for cereals such as maize.
4. Crop rotation helps in:
a) Increasing soil erosion
b) Breaking pest and disease cycles
c) Reducing soil fertility
d) Promoting monocropping
Answer: b) Breaking pest and disease cycles
Explanation: Rotating crops prevents the buildup of pests and pathogens specific to a particular crop, maintaining soil health and reducing chemical inputs.
5. Which cropping system is commonly used in rice-wheat cultivation?
a) Mono-cropping
b) Relay cropping
c) Sequential cropping
d) Mixed cropping
Answer: c) Sequential cropping
Explanation: Rice and wheat are grown one after another in the same field across seasons, which is an example of sequential cropping.
6. Fallowing in cropping systems refers to:
a) Planting two crops together
b) Leaving land uncultivated for a season
c) Growing cover crops
d) Applying organic manure
Answer: b) Leaving land uncultivated for a season
Explanation: Fallowing allows soil to recover nutrients and moisture, improving soil fertility naturally.
7. Which is NOT a benefit of intercropping?
a) Efficient land use
b) Increased biodiversity
c) Higher pest resistance
d) Increased monoculture dependency
Answer: d) Increased monoculture dependency
Explanation: Intercropping reduces monoculture dependency by diversifying crops, which improves system resilience.
8. Alley cropping is:
a) Planting crops along tree rows
b) Growing crops sequentially
c) Leaving land fallow
d) Growing only legumes
Answer: a) Planting crops along tree rows
Explanation: Alley cropping integrates trees with crops, reducing soil erosion, enhancing soil fertility, and providing additional income from trees.
9. Which of the following improves nitrogen content in the soil naturally?
a) Chemical fertilizers
b) Leguminous crops
c) Continuous cereal cropping
d) Pesticide application
Answer: b) Leguminous crops
Explanation: Legumes fix atmospheric nitrogen through symbiosis with Rhizobium bacteria, enriching soil fertility.
10. The main purpose of crop diversification is to:
a) Reduce risk and increase productivity
b) Promote monocropping
c) Increase soil erosion
d) Reduce labor requirement only
Answer: a) Reduce risk and increase productivity
Explanation: Diversifying crops reduces economic risk, enhances soil fertility, and ensures sustainable resource use.
11. Which practice reduces soil erosion and improves soil structure?
a) Contour farming
b) Monocropping
c) Excessive tillage
d) Over-fertilization
Answer: a) Contour farming
Explanation: Planting along natural land contours reduces water runoff and soil loss while improving soil structure.
12. Relay cropping is defined as:
a) Sowing a second crop before the first crop is harvested
b) Growing crops after leaving the land fallow
c) Intercropping cereals with legumes
d) Mono-cropping in the same field
Answer: a) Sowing a second crop before the first crop is harvested
Explanation: Relay cropping ensures continuous land use and reduces the gap between two crops, optimizing productivity.
13. Which of the following is a major advantage of crop rotation?
a) Soil nutrient depletion
b) Pest and disease management
c) Increased weed growth
d) Reduced biodiversity
Answer: b) Pest and disease management
Explanation: Rotating crops disrupts pest cycles and reduces disease incidence naturally.
14. Which is considered a sustainable nutrient management practice?
a) Excessive chemical fertilizer application
b) Use of compost and green manure
c) Burning crop residues
d) Continuous mono-cropping
Answer: b) Use of compost and green manure
Explanation: Organic amendments like compost and green manure improve soil fertility without harming the environment.
15. Which cropping system is commonly followed in rainfed areas?
a) Sequential cropping
b) Intercropping
c) Mono-cropping
d) Relay cropping
Answer: b) Intercropping
Explanation: Intercropping helps rainfed farmers manage risk due to irregular rainfall and improves resource use efficiency.
16. Strip cropping is designed to:
a) Reduce pests
b) Reduce soil erosion
c) Increase fertilizer use
d) Promote monocropping
Answer: b) Reduce soil erosion
Explanation: Alternating strips of different crops along the slope slows water flow and reduces soil loss.
17. Which is an example of a legume-based crop rotation?
a) Wheat → Rice
b) Maize → Cowpea → Sorghum
c) Rice → Sugarcane
d) Cotton → Mustard
Answer: b) Maize → Cowpea → Sorghum
Explanation: Including a legume in rotation improves soil nitrogen and overall productivity.
18. Organic farming mainly relies on:
a) Synthetic pesticides
b) Green manures and compost
c) Chemical fertilizers
d) GM crops
Answer: b) Green manures and compost
Explanation: Organic farming avoids synthetic chemicals and focuses on natural inputs to maintain soil health and sustainability.
19. Which of the following is NOT a component of sustainable agriculture?
a) Crop diversification
b) Soil conservation
c) Excessive pesticide use
d) Water conservation
Answer: c) Excessive pesticide use
Explanation: Sustainable agriculture minimizes chemical use to protect ecosystems and human health.
20. Which method is suitable for controlling weeds in sustainable systems?
a) Mulching
b) Overuse of herbicides
c) Continuous mono-cropping
d) Excessive tillage
Answer: a) Mulching
Explanation: Mulching suppresses weed growth naturally, conserves soil moisture, and adds organic matter.
21. Green manuring involves:
a) Applying chemical fertilizers
b) Growing and plowing leguminous crops into soil
c) Burning crop residues
d) Continuous cropping
Answer: b) Growing and plowing leguminous crops into soil
Explanation: Green manure improves soil fertility, organic matter, and nitrogen content naturally.
22. Mixed cropping refers to:
a) Growing multiple crops simultaneously without a definite row pattern
b) Growing crops in rotation
c) Leaving fields fallow
d) Mono-cropping
Answer: a) Growing multiple crops simultaneously without a definite row pattern
Explanation: Mixed cropping ensures better land use efficiency and reduces crop failure risk.
23. Which cropping system is common in smallholder farms to ensure food security?
a) Intercropping
b) Mono-cropping
c) Relay cropping
d) Continuous cereal cropping
Answer: a) Intercropping
Explanation: Smallholder farmers use intercropping to reduce risk and ensure multiple harvests in a single season.
24. Crop residues can be used for:
a) Soil fertility improvement
b) Livestock feed
c) Mulching
d) All of the above
Answer: d) All of the above
Explanation: Crop residues contribute to nutrient cycling, feed, and soil conservation.
25. Which of the following is a major goal of sustainable agriculture?
a) Maximizing short-term yield at the cost of environment
b) Long-term productivity and ecological balance
c) Ignoring soil fertility
d) Overuse of water resources
Answer: b) Long-term productivity and ecological balance
Explanation: Sustainable agriculture balances production needs with environmental stewardship.
26. Which system improves soil organic carbon content effectively?
a) Mono-cropping
b) Crop rotation with legumes
c) Continuous cereal cropping
d) Excessive tillage
Answer: b) Crop rotation with legumes
Explanation: Legumes enhance soil nitrogen and organic carbon content, improving fertility and sustainability.
27. Strip cropping alternates crops along:
a) Rows of the same crop
b) Land contours
c) Fallow land
d) Mono-cropped fields
Answer: b) Land contours
Explanation: This method prevents soil erosion on sloping land.
28. Which is a benefit of relay cropping?
a) Reduced land use efficiency
b) Continuous production with minimal gaps
c) Increased pest incidence
d) Reduced soil fertility
Answer: b) Continuous production with minimal gaps
Explanation: Relay cropping maximizes land productivity and reduces idle time between crops.
29. Which of the following is suitable for improving degraded soils?
a) Crop rotation with legumes
b) Continuous mono-cropping
c) Excessive chemical fertilizer use
d) Overgrazing
Answer: a) Crop rotation with legumes
Explanation: Legumes restore nitrogen, improve soil fertility, and help rehabilitate degraded soils.
30. Which practice conserves soil moisture in sustainable farming?
a) Mulching
b) Excessive tillage
c) Monocropping
d) Burning residues
Answer: a) Mulching
Explanation: Mulching reduces evaporation, retains soil moisture, and protects soil from erosion.
31. The main objective of crop diversification is:
a) Increasing vulnerability to pests
b) Reducing economic and climatic risks
c) Promoting monocropping
d) Overuse of fertilizers
Answer: b) Reducing economic and climatic risks
Explanation: Diversification spreads risk and ensures stable production.
32. Which of the following crops is a legume commonly used for green manuring?
a) Sunflower
b) Cowpea
c) Wheat
d) Maize
Answer: b) Cowpea
Explanation: Cowpea fixes nitrogen and enriches soil fertility when plowed as green manure.
33. What is the key advantage of intercropping legumes with cereals?
a) Increased chemical fertilizer requirement
b) Natural nitrogen enrichment
c) Reduced yield
d) Increased pest infestation
Answer: b) Natural nitrogen enrichment
Explanation: Legumes improve soil nitrogen, benefiting cereals grown alongside.
34. Relay cropping is advantageous in:
a) Shortening the cropping cycle
b) Increasing the gap between crops
c) Promoting monocropping
d) Reducing land use efficiency
Answer: a) Shortening the cropping cycle
Explanation: Relay cropping overlaps crops to make efficient use of time and resources.
35. Agroforestry integrates:
a) Crops and livestock
b) Crops and trees
c) Trees and fish
d) Crops and fallow land
Answer: b) Crops and trees
Explanation: Agroforestry combines trees with crops to improve biodiversity, soil fertility, and income.
36. Which cropping system reduces the risk of total crop failure during drought?
a) Mono-cropping
b) Intercropping
c) Continuous cereal cropping
d) Relay cropping
Answer: b) Intercropping
Explanation: Growing multiple crops together ensures at least partial yield during adverse conditions.
37. Which system helps in nitrogen conservation and soil fertility improvement?
a) Crop rotation with legumes
b) Continuous cereal cropping
c) Over-fertilization
d) Mono-cropping
Answer: a) Crop rotation with legumes
Explanation: Legumes fix atmospheric nitrogen and replenish soil nutrients.
38. Which is an environmentally friendly weed control method?
a) Mulching
b) Herbicide overuse
c) Burning crop residues
d) Excessive tillage
Answer: a) Mulching
Explanation: Mulching suppresses weeds, conserves moisture, and enriches soil organically.
39. Sustainable cropping systems aim to:
a) Reduce biodiversity
b) Maintain long-term productivity
c) Increase chemical dependency
d) Promote monoculture only
Answer: b) Maintain long-term productivity
Explanation: Sustainability ensures continuous productivity without harming the environment.
40. Which of the following improves resilience against climate change?
a) Crop diversification
b) Continuous mono-cropping
c) Excessive tillage
d) Overuse of chemicals
Answer: a) Crop diversification
Explanation: Diverse crops adapt better to changing climatic conditions.
41. Which crop is commonly used as a green manure in rice-based systems?
a) Sesbania
b) Wheat
c) Maize
d) Barley
Answer: a) Sesbania
Explanation: Sesbania enriches nitrogen content and improves soil health when incorporated as green manure.
42. Which cropping system maximizes land use in small farms?
a) Intercropping
b) Mono-cropping
c) Relay cropping
d) Fallowing
Answer: a) Intercropping
Explanation: Intercropping allows multiple crops on the same plot simultaneously.
43. Crop residues management in sustainable agriculture includes:
a) Burning residues
b) Using residues as mulch or compost
c) Ignoring residues
d) Selling residues only
Answer: b) Using residues as mulch or compost
Explanation: Residue management recycles nutrients and improves soil health.
44. Which of the following is NOT a type of cropping system?
a) Mono-cropping
b) Intercropping
c) Crop rotation
d) Soil erosion
Answer: d) Soil erosion
Explanation: Soil erosion is a problem, not a cropping system.
45. Which practice improves long-term soil fertility in sustainable systems?
a) Green manuring
b) Continuous chemical fertilization
c) Mono-cropping
d) Burning residues
Answer: a) Green manuring
Explanation: Green manures restore organic matter and nutrients, enhancing soil fertility.
46. Which of the following is an example of sequential cropping?
a) Rice → Wheat
b) Maize + Cowpea
c) Mixed cropping
d) Alley cropping
Answer: a) Rice → Wheat
Explanation: Sequential cropping grows crops one after another in the same field.
47. Sustainable agriculture promotes:
a) Chemical dependency
b) Soil and water conservation
c) Monocropping only
d) Ignoring biodiversity
Answer: b) Soil and water conservation
Explanation: Sustainability focuses on efficient use and protection of natural resources.
48. Relay cropping is mainly practiced to:
a) Increase idle land
b) Overlap crop cycles and improve productivity
c) Promote pest infestation
d) Reduce yield
Answer: b) Overlap crop cycles and improve productivity
Explanation: Relay cropping ensures continuous production and resource optimization.
49. Which system is effective for reducing wind and water erosion?
a) Contour farming and strip cropping
b) Continuous tillage
c) Mono-cropping
d) Relay cropping
Answer: a) Contour farming and strip cropping
Explanation: Planting along slopes and alternating strips slows water flow and protects soil.
50. Key features of sustainable cropping systems include:
a) Crop rotation, intercropping, organic inputs
b) Monocropping and excessive chemicals
c) Ignoring soil fertility
d) Continuous fallow
Answer: a) Crop rotation, intercropping, organic inputs
Explanation: These practices enhance productivity while preserving ecological balance.
Conclusion
Cropping systems and sustainable agriculture are closely linked in ensuring long-term food security, soil health, and environmental conservation. Through crop rotation, intercropping, relay cropping, and organic nutrient management, farmers can maximize productivity while minimizing ecological impact. Adopting these practices equips agriculture to meet current and future challenges, making farming more resilient, profitable, and environmentally friendly. Students preparing for competitive exams can benefit greatly from understanding these concepts through MCQs, as they reinforce both theory and practical application in agriculture.
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