Pesticides, Biopesticides and Safe Pest Management MCQs 2026

The safest storage practice for pesticides is to keep them:

1. A In drink bottles for easy measuring ✓
2. B Locked in original labeled containers away from children, feed, seed, and food ✓
3. C Beside kitchen flour and spices ✓
4. D Open in sunlight near animals ✓

Botanical pesticides are pesticides derived mainly from:

1. A Plants or plant extracts ✓
2. B Petroleum engine oil only ✓
3. C Synthetic metal alloys ✓
4. D Radioactive minerals ✓

A secondary pest outbreak after pesticide use often results from:

1. A Better calibration of nozzles ✓
2. B Use of clean protective clothing ✓
3. C Following pre-harvest interval ✓
4. D Reduction of natural enemies by broad-spectrum sprays ✓

Rainfastness of a pesticide refers to:

1. A Its ability to create rainfall ✓
2. B The speed of sprayer walking ✓
3. C The time needed after application before rain will not wash it off significantly ✓
4. D The number of pests per leaf ✓

Before filling a knapsack sprayer, the operator should first:

1. A Mix pesticide with bare hands ✓
2. B Check for leaks, blocked nozzles, and worn seals ✓
3. C Remove the label from the container ✓
4. D Stand downwind of the chemical ✓

Applying more pesticide than the label recommends usually:

1. A Increases hazards, residues, cost, and resistance pressure ✓
2. B Guarantees permanent pest eradication ✓
3. C Makes protective equipment unnecessary ✓
4. D Improves food safety automatically ✓

Empty pesticide containers should never be reused for:

1. A Approved puncturing after rinsing ✓
2. B Collection by authorized disposal systems ✓
3. C Label-guided disposal procedures ✓
4. D Storing food, water, feed, or household materials ✓

Pheromone mating disruption works by:

1. A Improving fertilizer uptake ✓
2. B Increasing pesticide residues ✓
3. C Confusing males so they fail to locate females ✓
4. D Changing crop variety automatically ✓

Bt sprays against caterpillars are usually most effective when applied to:

1. A Adult mammals in the field ✓
2. B Young larvae before they bore into plant tissue ✓
3. C Dry seeds kept in bags ✓
4. D Fungal spores inside soil only ✓

Biopesticides often require careful timing because they may:

1. A Act more slowly and work best on early pest stages ✓
2. B Always kill pests before contact ✓
3. C Remain effective after any storage condition ✓
4. D Replace all monitoring permanently ✓

Pesticide resistance is best defined as:

1. A Temporary pest escape due to rainfall only ✓
2. B Correct label use by farmers ✓
3. C The natural color of a pesticide ✓
4. D A heritable reduction in pest sensitivity to a pesticide ✓

Spray-water pH is important because unsuitable pH can:

1. A Change soil texture instantly ✓
2. B Make all pesticides organic ✓
3. C Reduce stability or effectiveness of some pesticides ✓
4. D Remove the need for label directions ✓

Cleaning spray equipment near wells, canals, or ponds is unsafe because it can:

1. A Increase sprayer accuracy ✓
2. B Contaminate water sources ✓
3. C Improve fish health ✓
4. D Neutralize all pesticide residues ✓

Granular pesticide formulations are often useful because they:

1. A Reduce drift and allow placement in soil or whorls ✓
2. B Must be inhaled to be effective ✓
3. C Cannot be applied with equipment ✓
4. D Always dissolve instantly in air ✓

Anticoagulant rodenticides kill rodents mainly by:

1. A Increasing photosynthesis ✓
2. B Blocking seed germination ✓
3. C Acting as insect pheromones ✓
4. D Interfering with normal blood clotting ✓

Pyrethroid insecticides primarily affect insect nerves by acting on:

1. A Chlorophyll molecules ✓
2. B Root hair formation ✓
3. C Voltage-gated sodium channels ✓
4. D Fungal cell walls only ✓

Organophosphate and carbamate insecticides commonly act by inhibiting:

1. A Photosynthesis in crop leaves ✓
2. B Acetylcholinesterase ✓
3. C Nitrogen fixation in legumes ✓
4. D Seed dormancy enzymes only ✓

Common warning signs of acute pesticide poisoning may include:

1. A Headache, nausea, sweating, dizziness, or breathing difficulty ✓
2. B Improved appetite and faster growth ✓
3. C Immediate immunity to future exposure ✓
4. D Complete absence of symptoms in all cases ✓

Maximum residue limit is the legally permitted maximum amount of pesticide residue in:

1. A Sprayer tires only ✓
2. B Empty measuring cups ✓
3. C Irrigation pump oil ✓
4. D Food or feed commodities ✓

Chronic toxicity refers to harmful effects caused by:

1. A A single short exposure only ✓
2. B Mechanical injury from a sprayer nozzle ✓
3. C Long-term or repeated exposure ✓
4. D Lack of rainfall after sowing ✓

A buffer zone during spraying is maintained to protect:

1. A Only the pesticide dealer ✓
2. B Water bodies, sensitive crops, people, and habitats from drift ✓
3. C The spray tank from sunlight ✓
4. D The crop from irrigation water ✓

A selective pesticide is preferred in IPM because it:

1. A Targets the pest with less harm to beneficial organisms ✓
2. B Kills every organism in the field equally ✓
3. C Always has no label restrictions ✓
4. D Replaces crop rotation ✓

Signal words such as Danger, Warning, and Caution on labels indicate:

1. A Expected crop yield ✓
2. B Soil organic matter status ✓
3. C The price of the pesticide ✓
4. D Relative acute toxicity hazard of the product ✓

A microbial pesticide contains or is derived from:

1. A Only ground limestone ✓
2. B Synthetic plastic granules ✓
3. C A microorganism such as a bacterium, fungus, virus, or protozoan ✓
4. D Irrigation water without organisms ✓

Insecticidal soaps are most effective against:

1. A Deep-boring stem borer larvae only ✓
2. B Soft-bodied pests such as aphids, mites, and whiteflies ✓
3. C Fungal spores inside seed embryos ✓
4. D Large mammals in fields ✓

If pesticide spills on skin, the first safe response is to:

1. A Remove contaminated clothing and wash the skin with plenty of water ✓
2. B Continue spraying until the tank is empty ✓
3. C Rub the chemical into the skin ✓
4. D Cover it with soil and wait ✓

While mixing or spraying pesticides, a worker should not:

1. A Read the label before use ✓
2. B Wear protective gloves ✓
3. C Check the sprayer for leaks ✓
4. D Eat, drink, smoke, or touch the face ✓

Dust formulations require extra care because they:

1. A Always have zero toxicity ✓
2. B Cannot contain active ingredients ✓
3. C Can drift easily and increase inhalation exposure ✓
4. D Are used only inside sealed laboratories ✓

An adjuvant is added to a spray mixture mainly to:

1. A Replace the active ingredient completely ✓
2. B Improve spreading, sticking, wetting, or penetration ✓
3. C Increase pest resistance ✓
4. D Convert insecticide into fertilizer ✓

Before preparing an unfamiliar tank mix, a small jar test is used to check:

1. A Physical compatibility of the mixture ✓
2. B Seed germination percentage ✓
3. C Soil texture class ✓
4. D Market demand for produce ✓

Spot treatment means applying pesticide:

1. A Across all fields regardless of pest presence ✓
2. B Only after the crop is harvested ✓
3. C Directly into drinking water sources ✓
4. D Only to infested patches or localized problem areas ✓

The mode-of-action group on a pesticide label is useful because it helps growers:

1. A Ignore the recommended dose ✓
2. B Choose containers for household reuse ✓
3. C Plan rotations to reduce resistance risk ✓
4. D Avoid all field monitoring ✓

Baculovirus biopesticides are generally known for being:

1. A Broad-spectrum herbicides ✓
2. B Highly specific to particular insect hosts ✓
3. C Soil salinity correctors ✓
4. D Immediate contact poisons for all pests ✓

Azadirachtin, the active compound associated with neem products, mainly acts as:

1. A An antifeedant and insect growth regulator ✓
2. B A synthetic fumigant gas only ✓
3. C A mineral fertilizer ✓
4. D A rodent anticoagulant ✓

Expired or banned pesticides should:

1. A Be mixed at double dose ✓
2. B Be poured into irrigation channels ✓
3. C Be stored in food containers ✓
4. D Not be used and should be disposed of according to regulations ✓

Sprayer calibration is the process of determining:

1. A The market price of the crop ✓
2. B The number of pests in storage ✓
3. C The actual spray output per unit area ✓
4. D The color grade of fertilizer ✓

Triple rinsing empty pesticide containers is recommended because it:

1. A Makes containers safe for drinking water storage ✓
2. B Recovers remaining pesticide and reduces contamination risk ✓
3. C Increases pesticide strength ✓
4. D Removes the need for disposal rules ✓

Re-entry interval is the minimum time after pesticide application before:

1. A Workers may safely enter the treated area without specified protection ✓
2. B The crop must be irrigated ✓
3. C The pesticide can be purchased ✓
4. D Seeds can be stored in bags ✓

Spraying during high wind should be avoided primarily to reduce:

1. A Pesticide solubility in the tank ✓
2. B Seed germination rate ✓
3. C The need for nozzle selection ✓
4. D Spray drift away from the target area ✓

Compared with many broad-spectrum synthetic pesticides, many biopesticides are valued because they are:

1. A Always effective without correct timing ✓
2. B Identical to chemical fertilizers ✓
3. C More target-specific and often leave fewer harmful residues ✓
4. D Toxic to every organism equally ✓

An emulsifiable concentrate usually contains active ingredient dissolved in solvent plus:

1. A Live parasitoids only ✓
2. B An emulsifier that helps it mix with water ✓
3. C Dry clay granules only ✓
4. D Untreated seed ✓

A wettable powder formulation is designed to:

1. A Form a suspension when mixed with water ✓
2. B Dissolve completely like table salt ✓
3. C Be used only as a gas ✓
4. D Contain no active ingredient ✓

A systemic pesticide is characterized by its ability to:

1. A Remain only on the outside of the spray tank ✓
2. B Act only as a mechanical trap ✓
3. C Lose all activity after mixing with water ✓
4. D Be absorbed and translocated within plant tissues ✓

A contact pesticide is one that:

1. A Moves throughout the plant after root uptake only ✓
2. B Controls pests only through genetic inheritance ✓
3. C Acts when it directly contacts the pest or treated surface ✓
4. D Works only after harvest in storage ✓

Resistance management is best supported by:

1. A Using the same pesticide repeatedly at low dose ✓
2. B Rotating pesticides with different modes of action ✓
3. C Ignoring label dose to save cost ✓
4. D Spraying only when wind is strongest ✓

A pesticide with a lower LD50 value is generally:

1. A More acutely toxic ✓
2. B Less toxic to all organisms ✓
3. C Always safer for pollinators ✓
4. D Unable to enter the body ✓

Basic personal protective equipment for pesticide mixing commonly includes:

1. A Only sandals and a cotton cap ✓
2. B Bare hands for better measuring ✓
3. C A food container for measuring chemical ✓
4. D Chemical-resistant gloves, mask or respirator, eye protection, and covered clothing ✓

Pre-harvest interval refers to the minimum time between:

1. A Seed sowing and first irrigation ✓
2. B Fertilizer purchase and application ✓
3. C Last pesticide application and harvest ✓
4. D Sprayer washing and storage ✓

Bacillus thuringiensis products control susceptible larvae mainly through:

1. A Increasing soil nitrogen fixation ✓
2. B Protein toxins activated in the insect gut ✓
3. C Blocking photosynthesis in weeds ✓
4. D Repelling birds from fields ✓

For safe pesticide use, the pesticide label should be treated as:

1. A A legal and technical guide for correct use ✓
2. B A general advertisement with no legal value ✓
3. C A document used only by pesticide dealers ✓
4. D A substitute for field scouting ✓