Pesticides, Biopesticides and Safe Pest Management MCQs 2026

The safest storage practice for pesticides is to keep them:

1. AIn drink bottles for easy measuring✓
2. BLocked in original labeled containers away from children, feed, seed, and food✓
3. CBeside kitchen flour and spices✓
4. DOpen in sunlight near animals✓

Botanical pesticides are pesticides derived mainly from:

1. APlants or plant extracts✓
2. BPetroleum engine oil only✓
3. CSynthetic metal alloys✓
4. DRadioactive minerals✓

A secondary pest outbreak after pesticide use often results from:

1. ABetter calibration of nozzles✓
2. BUse of clean protective clothing✓
3. CFollowing pre-harvest interval✓
4. DReduction of natural enemies by broad-spectrum sprays✓

Rainfastness of a pesticide refers to:

1. AIts ability to create rainfall✓
2. BThe speed of sprayer walking✓
3. CThe time needed after application before rain will not wash it off significantly✓
4. DThe number of pests per leaf✓

Before filling a knapsack sprayer, the operator should first:

1. AMix pesticide with bare hands✓
2. BCheck for leaks, blocked nozzles, and worn seals✓
3. CRemove the label from the container✓
4. DStand downwind of the chemical✓

Applying more pesticide than the label recommends usually:

1. AIncreases hazards, residues, cost, and resistance pressure✓
2. BGuarantees permanent pest eradication✓
3. CMakes protective equipment unnecessary✓
4. DImproves food safety automatically✓

Empty pesticide containers should never be reused for:

1. AApproved puncturing after rinsing✓
2. BCollection by authorized disposal systems✓
3. CLabel-guided disposal procedures✓
4. DStoring food, water, feed, or household materials✓

Pheromone mating disruption works by:

1. AImproving fertilizer uptake✓
2. BIncreasing pesticide residues✓
3. CConfusing males so they fail to locate females✓
4. DChanging crop variety automatically✓

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

1. AAdult mammals in the field✓
2. BYoung larvae before they bore into plant tissue✓
3. CDry seeds kept in bags✓
4. DFungal spores inside soil only✓

Biopesticides often require careful timing because they may:

1. AAct more slowly and work best on early pest stages✓
2. BAlways kill pests before contact✓
3. CRemain effective after any storage condition✓
4. DReplace all monitoring permanently✓

Pesticide resistance is best defined as:

1. ATemporary pest escape due to rainfall only✓
2. BCorrect label use by farmers✓
3. CThe natural color of a pesticide✓
4. DA heritable reduction in pest sensitivity to a pesticide✓

Spray-water pH is important because unsuitable pH can:

1. AChange soil texture instantly✓
2. BMake all pesticides organic✓
3. CReduce stability or effectiveness of some pesticides✓
4. DRemove the need for label directions✓

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

1. AIncrease sprayer accuracy✓
2. BContaminate water sources✓
3. CImprove fish health✓
4. DNeutralize all pesticide residues✓

Granular pesticide formulations are often useful because they:

1. AReduce drift and allow placement in soil or whorls✓
2. BMust be inhaled to be effective✓
3. CCannot be applied with equipment✓
4. DAlways dissolve instantly in air✓

Anticoagulant rodenticides kill rodents mainly by:

1. AIncreasing photosynthesis✓
2. BBlocking seed germination✓
3. CActing as insect pheromones✓
4. DInterfering with normal blood clotting✓

Pyrethroid insecticides primarily affect insect nerves by acting on:

1. AChlorophyll molecules✓
2. BRoot hair formation✓
3. CVoltage-gated sodium channels✓
4. DFungal cell walls only✓

Organophosphate and carbamate insecticides commonly act by inhibiting:

1. APhotosynthesis in crop leaves✓
2. BAcetylcholinesterase✓
3. CNitrogen fixation in legumes✓
4. DSeed dormancy enzymes only✓

Common warning signs of acute pesticide poisoning may include:

1. AHeadache, nausea, sweating, dizziness, or breathing difficulty✓
2. BImproved appetite and faster growth✓
3. CImmediate immunity to future exposure✓
4. DComplete absence of symptoms in all cases✓

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

1. ASprayer tires only✓
2. BEmpty measuring cups✓
3. CIrrigation pump oil✓
4. DFood or feed commodities✓

Chronic toxicity refers to harmful effects caused by:

1. AA single short exposure only✓
2. BMechanical injury from a sprayer nozzle✓
3. CLong-term or repeated exposure✓
4. DLack of rainfall after sowing✓

A buffer zone during spraying is maintained to protect:

1. AOnly the pesticide dealer✓
2. BWater bodies, sensitive crops, people, and habitats from drift✓
3. CThe spray tank from sunlight✓
4. DThe crop from irrigation water✓

A selective pesticide is preferred in IPM because it:

1. ATargets the pest with less harm to beneficial organisms✓
2. BKills every organism in the field equally✓
3. CAlways has no label restrictions✓
4. DReplaces crop rotation✓

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

1. AExpected crop yield✓
2. BSoil organic matter status✓
3. CThe price of the pesticide✓
4. DRelative acute toxicity hazard of the product✓

A microbial pesticide contains or is derived from:

1. AOnly ground limestone✓
2. BSynthetic plastic granules✓
3. CA microorganism such as a bacterium, fungus, virus, or protozoan✓
4. DIrrigation water without organisms✓

Insecticidal soaps are most effective against:

1. ADeep-boring stem borer larvae only✓
2. BSoft-bodied pests such as aphids, mites, and whiteflies✓
3. CFungal spores inside seed embryos✓
4. DLarge mammals in fields✓

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

1. ARemove contaminated clothing and wash the skin with plenty of water✓
2. BContinue spraying until the tank is empty✓
3. CRub the chemical into the skin✓
4. DCover it with soil and wait✓

While mixing or spraying pesticides, a worker should not:

1. ARead the label before use✓
2. BWear protective gloves✓
3. CCheck the sprayer for leaks✓
4. DEat, drink, smoke, or touch the face✓

Dust formulations require extra care because they:

1. AAlways have zero toxicity✓
2. BCannot contain active ingredients✓
3. CCan drift easily and increase inhalation exposure✓
4. DAre used only inside sealed laboratories✓

An adjuvant is added to a spray mixture mainly to:

1. AReplace the active ingredient completely✓
2. BImprove spreading, sticking, wetting, or penetration✓
3. CIncrease pest resistance✓
4. DConvert insecticide into fertilizer✓

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

1. APhysical compatibility of the mixture✓
2. BSeed germination percentage✓
3. CSoil texture class✓
4. DMarket demand for produce✓

Spot treatment means applying pesticide:

1. AAcross all fields regardless of pest presence✓
2. BOnly after the crop is harvested✓
3. CDirectly into drinking water sources✓
4. DOnly to infested patches or localized problem areas✓

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

1. AIgnore the recommended dose✓
2. BChoose containers for household reuse✓
3. CPlan rotations to reduce resistance risk✓
4. DAvoid all field monitoring✓

Baculovirus biopesticides are generally known for being:

1. ABroad-spectrum herbicides✓
2. BHighly specific to particular insect hosts✓
3. CSoil salinity correctors✓
4. DImmediate contact poisons for all pests✓

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

1. AAn antifeedant and insect growth regulator✓
2. BA synthetic fumigant gas only✓
3. CA mineral fertilizer✓
4. DA rodent anticoagulant✓

Expired or banned pesticides should:

1. ABe mixed at double dose✓
2. BBe poured into irrigation channels✓
3. CBe stored in food containers✓
4. DNot be used and should be disposed of according to regulations✓

Sprayer calibration is the process of determining:

1. AThe market price of the crop✓
2. BThe number of pests in storage✓
3. CThe actual spray output per unit area✓
4. DThe color grade of fertilizer✓

Triple rinsing empty pesticide containers is recommended because it:

1. AMakes containers safe for drinking water storage✓
2. BRecovers remaining pesticide and reduces contamination risk✓
3. CIncreases pesticide strength✓
4. DRemoves the need for disposal rules✓

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

1. AWorkers may safely enter the treated area without specified protection✓
2. BThe crop must be irrigated✓
3. CThe pesticide can be purchased✓
4. DSeeds can be stored in bags✓

Spraying during high wind should be avoided primarily to reduce:

1. APesticide solubility in the tank✓
2. BSeed germination rate✓
3. CThe need for nozzle selection✓
4. DSpray drift away from the target area✓

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

1. AAlways effective without correct timing✓
2. BIdentical to chemical fertilizers✓
3. CMore target-specific and often leave fewer harmful residues✓
4. DToxic to every organism equally✓

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

1. ALive parasitoids only✓
2. BAn emulsifier that helps it mix with water✓
3. CDry clay granules only✓
4. DUntreated seed✓

A wettable powder formulation is designed to:

1. AForm a suspension when mixed with water✓
2. BDissolve completely like table salt✓
3. CBe used only as a gas✓
4. DContain no active ingredient✓

A systemic pesticide is characterized by its ability to:

1. ARemain only on the outside of the spray tank✓
2. BAct only as a mechanical trap✓
3. CLose all activity after mixing with water✓
4. DBe absorbed and translocated within plant tissues✓

A contact pesticide is one that:

1. AMoves throughout the plant after root uptake only✓
2. BControls pests only through genetic inheritance✓
3. CActs when it directly contacts the pest or treated surface✓
4. DWorks only after harvest in storage✓

Resistance management is best supported by:

1. AUsing the same pesticide repeatedly at low dose✓
2. BRotating pesticides with different modes of action✓
3. CIgnoring label dose to save cost✓
4. DSpraying only when wind is strongest✓

A pesticide with a lower LD50 value is generally:

1. AMore acutely toxic✓
2. BLess toxic to all organisms✓
3. CAlways safer for pollinators✓
4. DUnable to enter the body✓

Basic personal protective equipment for pesticide mixing commonly includes:

1. AOnly sandals and a cotton cap✓
2. BBare hands for better measuring✓
3. CA food container for measuring chemical✓
4. DChemical-resistant gloves, mask or respirator, eye protection, and covered clothing✓

Pre-harvest interval refers to the minimum time between:

1. ASeed sowing and first irrigation✓
2. BFertilizer purchase and application✓
3. CLast pesticide application and harvest✓
4. DSprayer washing and storage✓

Bacillus thuringiensis products control susceptible larvae mainly through:

1. AIncreasing soil nitrogen fixation✓
2. BProtein toxins activated in the insect gut✓
3. CBlocking photosynthesis in weeds✓
4. DRepelling birds from fields✓

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

1. AA legal and technical guide for correct use✓
2. BA general advertisement with no legal value✓
3. CA document used only by pesticide dealers✓
4. DA substitute for field scouting✓