Sustainable, Organic and Conservation Agriculture MCQs 2026

Increasing soil organic matter commonly improves cation exchange capacity because organic matter:

1. A Converts all nutrients into unavailable gases ✓
2. B Removes clay minerals from the soil profile ✓
3. C Provides many negatively charged sites that hold nutrient cations ✓
4. D Prevents roots from absorbing calcium and magnesium ✓

The central objective of sustainable agriculture is to:

1. A Maintain productivity while conserving natural resources for future use ✓
2. B Maximize short-term yield by increasing all inputs ✓
3. C Replace all food crops with forestry plantations ✓
4. D Eliminate livestock from farming systems ✓

Certified organic crop production most directly prohibits the routine use of:

1. A Crop rotations and green manuring ✓
2. B Synthetic fertilizers and synthetic pesticides not allowed by standards ✓
3. C Farmyard manure after proper handling ✓
4. D Biological pest control agents ✓

The three core principles of conservation agriculture are minimum soil disturbance, permanent soil cover, and:

1. A Flood irrigation in every season ✓
2. B Deep inversion ploughing before each crop ✓
3. C Diversified crop rotations or associations ✓
4. D Removal of all residues from the field ✓

A green manure crop improves soil fertility mainly by:

1. A Increasing soil compaction for better root anchorage ✓
2. B Removing organic matter from the plough layer ✓
3. C Stopping microbial activity in the rhizosphere ✓
4. D Adding decomposable biomass and, in legumes, biologically fixed nitrogen ✓

Zero tillage helps conserve soil moisture primarily because it:

1. A Reduces soil disturbance and evaporation from the soil surface ✓
2. B Increases the number of ploughing operations ✓
3. C Requires burning of crop residues before sowing ✓
4. D Prevents any infiltration of rainfall ✓

Rhizobium biofertilizer is applied mainly to legume crops because it:

1. A Controls all fungal diseases in cereals ✓
2. B Forms root nodules that fix atmospheric nitrogen ✓
3. C Supplies potassium through rock weathering only ✓
4. D Acts as a chemical herbicide in broadleaf crops ✓

Integrated pest management begins with which decision-making practice?

1. A Spraying pesticides according to a fixed calendar only ✓
2. B Removing all natural enemies from the field ✓
3. C Monitoring pest populations and comparing them with economic thresholds ✓
4. D Using the highest pesticide dose at first pest appearance ✓

A cover crop reduces erosion after harvest mainly by:

1. A Keeping the soil bare during heavy rain ✓
2. B Increasing the speed of surface runoff ✓
3. C Destroying soil aggregates before the next crop ✓
4. D Protecting the soil surface from raindrop impact and runoff ✓

An important benefit of well-decomposed farmyard manure, besides supplying nutrients, is that it:

1. A Improves soil structure, aeration, and water-holding capacity ✓
2. B Permanently sterilizes the soil ✓
3. C Eliminates the need for crop rotation in all cases ✓
4. D Converts sandy soil into pure clay ✓

A practical sign of mature compost is that it is:

1. A Fresh, hot, and smelling strongly of ammonia ✓
2. B Dark, crumbly, earthy-smelling, and no longer heating strongly ✓
3. C Mostly undecomposed straw with a very high C:N ratio ✓
4. D Blue-green because of anaerobic decomposition ✓

Including a legume in rotation before a cereal crop can improve cereal performance mainly through:

1. A Permanent elimination of all insect pests ✓
2. B Increasing soil salinity to suppress weeds ✓
3. C Residual nitrogen from biological nitrogen fixation ✓
4. D Preventing root growth in the following crop ✓

In organic certification, the conversion period refers to the time during which:

1. A Synthetic inputs are increased to restore fertility ✓
2. B Crops are converted from grain to fodder only ✓
3. C All soil organisms are removed from the field ✓
4. D Land is managed organically before produce can be sold as certified organic ✓

Mulching suppresses many weeds mainly by:

1. A Blocking light and physically hindering weed seedling emergence ✓
2. B Increasing weed seed exposure to direct sunlight ✓
3. C Adding synthetic herbicide to every irrigation ✓
4. D Making all weed seeds dormant forever ✓

Contour farming on sloping land is used primarily to:

1. A Increase erosion by directing water downhill ✓
2. B Slow runoff and reduce soil loss along the slope ✓
3. C Make furrows parallel to the steepest gradient ✓
4. D Remove all vegetation from terrace edges ✓

During early adoption, conservation agriculture may require special attention to weeds because:

1. A All weed seeds are killed by zero tillage immediately ✓
2. B Crop residues always act as selective herbicides ✓
3. C Reduced tillage can change weed flora and may increase reliance on careful residue and weed management ✓
4. D Weeds cannot germinate in undisturbed soil under any condition ✓

Vermicompost is produced primarily through decomposition by:

1. A High-pressure steam only ✓
2. B Synthetic nitrification inhibitors ✓
3. C Deep freezing of plant residues ✓
4. D Earthworms and associated microorganisms ✓

A cover crop used for allelopathic weed suppression in many cereal systems is:

1. A Sorghum or sorghum-sudan residues ✓
2. B Pure urea granules ✓
3. C Clean river sand ✓
4. D Gypsum powder only ✓

When composting straw with a very high carbon-to-nitrogen ratio, decomposition is usually improved by adding:

1. A Only dry sand in large quantities ✓
2. B A nitrogen-rich material such as green biomass or manure ✓
3. C Plastic sheets mixed throughout the pile ✓
4. D Common salt to stop microbial activity ✓

The 4R concept of nutrient stewardship means applying the right source at the right rate, right time, and:

1. A Right color ✓
2. B Right brand only ✓
3. C Right tractor speed only ✓
4. D Right place ✓

Which option is an example of biological control in crop protection?

1. A Release of Trichogramma parasitoids against lepidopteran borers ✓
2. B Increasing insecticide concentration above the label dose ✓
3. C Burning all field boundaries before flowering ✓
4. D Applying balanced fertilizer as a direct insect poison ✓

Residue retention moderates soil temperature largely because residues:

1. A Make soil absorb unlimited solar radiation ✓
2. B Insulate and shade the soil surface ✓
3. C Remove all moisture from the root zone ✓
4. D Prevent any gas exchange in soil ✓

A major risk of continuous monocropping is:

1. A Automatic improvement of biodiversity every season ✓
2. B Permanent elimination of weeds without control measures ✓
3. C Build-up of crop-specific pests, diseases, and nutrient imbalances ✓
4. D Uniform restoration of all micronutrients ✓

In dryland farming, rainwater harvesting practices are mainly intended to:

1. A Accelerate runoff from cultivated land ✓
2. B Keep rainfall away from the root zone ✓
3. C Replace soil moisture with saline groundwater ✓
4. D Increase infiltration and store more water for crop use ✓

Organic weed management relies most on:

1. A Crop rotation, mulches, competitive crops, and mechanical or manual weeding ✓
2. B Routine use of non-approved synthetic herbicides ✓
3. C Leaving the field bare for the whole year ✓
4. D Applying insecticides at higher doses ✓

Successful no-till seeding usually requires:

1. A Complete removal of all soil organic matter ✓
2. B A seed drill able to place seed accurately through surface residues ✓
3. C Deep mouldboard ploughing immediately before sowing ✓
4. D Flooding the field for several weeks before planting ✓

If a large amount of high C:N residue is incorporated, the immediate effect can be:

1. A Instant conversion of all carbon to nitrate ✓
2. B Sterilization of the soil profile ✓
3. C Temporary immobilization of mineral nitrogen by microbes ✓
4. D Permanent elimination of nitrogen fertilizer need ✓

Agroforestry contributes to sustainable agriculture by:

1. A Removing all perennial vegetation from farms ✓
2. B Using only one crop species on all land ✓
3. C Preventing nutrient cycling through litter fall ✓
4. D Integrating trees with crops or livestock to diversify production and ecosystem services ✓

Which is a useful soil health indicator affected by conservation practices?

1. A Aggregate stability ✓
2. B Paint color of the farm machinery ✓
3. C Number of shops near the field ✓
4. D Brand name of the seed bag ✓

Conservation tillage is commonly described as tillage that leaves at least about:

1. A 0 percent residue and a completely bare surface ✓
2. B 30 percent crop residue cover on the soil surface after planting ✓
3. C 90 percent of roots removed from the soil ✓
4. D 100 percent of residues burned before sowing ✓

An organic or natural source often used to supply phosphorus is:

1. A Diesel fuel ✓
2. B Common table salt ✓
3. C Rock phosphate ✓
4. D Plastic mulch ash only ✓

Arbuscular mycorrhizal fungi mainly help crops by:

1. A Producing synthetic urea in the leaves ✓
2. B Blocking all root growth ✓
3. C Increasing soil erosion under residues ✓
4. D Improving phosphorus and water uptake through fungal hyphae ✓

Burning crop residues is discouraged in sustainable farming because it:

1. A Loses organic carbon and nutrients while causing air pollution ✓
2. B Improves soil organic matter every time ✓
3. C Increases beneficial soil fauna immediately ✓
4. D Prevents greenhouse gas emissions ✓

Biodynamic agriculture is best described as:

1. A A system based only on synthetic fertilizers ✓
2. B An organic farming approach using specific preparations and whole-farm ecological management ✓
3. C A method that excludes compost and livestock integration ✓
4. D A practice limited to hydroponics without soil ✓

Buffer zones on organic farms are maintained mainly to:

1. A Increase pesticide drift into the organic crop ✓
2. B Store synthetic herbicides beside irrigation channels ✓
3. C Reduce contamination risk from adjacent conventional fields ✓
4. D Prevent inspection of farm boundaries ✓

Minimum tillage reduces erosion primarily by:

1. A Pulverizing soil into fine dust before every rain ✓
2. B Increasing runoff velocity in furrows ✓
3. C Removing all plant cover from the field ✓
4. D Maintaining more residues and stable soil aggregates at the surface ✓

A common leguminous green manure crop in Pakistan is:

1. A Sesbania, locally known as dhaincha or jantar ✓
2. B Wheat grown for grain ✓
3. C Sugarcane trash only ✓
4. D Cotton stalk without leaves ✓

Bacillus thuringiensis biopesticides are most effective against:

1. A All nematodes in every soil type ✓
2. B Susceptible caterpillar larvae of certain insect pests ✓
3. C Rust fungi inside wheat leaves ✓
4. D All annual grasses after emergence ✓

A sustainable approach to managing saline soils commonly includes:

1. A Using saline water without drainage indefinitely ✓
2. B Burning all crop residues after irrigation ✓
3. C Adequate drainage, quality irrigation water, and planned leaching where feasible ✓
4. D Applying only nitrogen fertilizer to remove salts ✓

Soil carbon sequestration is generally promoted by:

1. A Frequent residue burning ✓
2. B Continuous bare fallow ✓
3. C Removing all organic inputs from soil ✓
4. D Adding residues or cover crops and reducing unnecessary tillage ✓

In IPM, the economic threshold is the pest level at which:

1. A Control action should be taken to prevent economic loss ✓
2. B All pesticides must be banned permanently ✓
3. C The crop has already suffered total loss ✓
4. D Beneficial insects must always be destroyed ✓

In rice-wheat systems, zero-till wheat after rice can save:

1. A All seed costs in every season ✓
2. B Time, fuel, and some irrigation water compared with repeated tillage ✓
3. C The need for any weed management ✓
4. D Every nutrient input regardless of soil fertility ✓

Which feature best indicates that compost has become stable humus-like material?

1. A Fresh green leaves with strong ammonia smell ✓
2. B Visible plastic pieces throughout the compost ✓
3. C Low heating, earthy smell, and uniform decomposed texture ✓
4. D High temperature continuing for several months after application ✓

Composting livestock manure before field application is recommended because it can:

1. A Increase viable weed seeds in all cases ✓
2. B Remove all plant nutrients from the manure ✓
3. C Make manure unsuitable for soil organisms ✓
4. D Reduce pathogens and weed seeds while stabilizing nutrients ✓

Precision land leveling supports sustainable water management by:

1. A Improving uniform water distribution and reducing irrigation losses ✓
2. B Increasing high and low spots across the field ✓
3. C Preventing any crop emergence after irrigation ✓
4. D Requiring deeper ploughing after every watering ✓

Intercropping can improve sustainability because it often:

1. A Always reduces biodiversity to one species ✓
2. B Uses resources more completely and can reduce pest or disease spread ✓
3. C Requires burning residues between crop rows ✓
4. D Eliminates the need for sunlight in crops ✓

Which practice is an in-situ moisture conservation measure on sloping rainfed land?

1. A Straight downhill furrows to speed runoff ✓
2. B Complete removal of crop cover before rain ✓
3. C Contour bunding or tied ridging to hold rainfall where it falls ✓
4. D Deep drainage channels across all crop rows ✓

A common challenge during transition from conventional to organic farming is:

1. A Instant premium prices without inspection ✓
2. B Immediate disappearance of all pests and weeds ✓
3. C No need for soil fertility planning ✓
4. D Possible temporary yield decline and added certification or market requirements ✓

Residue mulch often improves infiltration by:

1. A Reducing crusting and slowing surface runoff ✓
2. B Sealing all soil pores permanently ✓
3. C Increasing raindrop impact on bare soil ✓
4. D Diverting rainfall away from the field ✓

In IPM, a trap crop is planted to:

1. A Supply synthetic pesticide to adjacent crops ✓
2. B Attract pests away from the main crop for easier management ✓
3. C Prevent pollination of the main crop ✓
4. D Increase pest damage in the main crop deliberately ✓