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Entomology & Integrated Pest Management (IPM) (Agriculture & Crop Sciences) Solved Questions & Notes (2026) - Apex Rankers

Agricultural & Veterinary Sciences > Agriculture & Crop Sciences > Entomology & Integrated Pest Management (IPM)

100 Total Questions
~150 mins Read Time
1 Subject Areas
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Q. 1 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Pink bollworm (Pectinophora gossypiella) causes damage in cotton by:
A
Root pruning
B
Adults defoliating leaves
C
Nymphs sucking phloem sap
D
Larvae boring into squares and developing bolls, feeding on lint and seed
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Larval feeding inside cotton bolls leads to stained lint, hollow seeds, and rosetted blooms.
Q. 2 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Insects belonging to order Hemiptera (Aphids, Whiteflies) possess which type of mouthparts?
A
Sponging
B
Siphoning
C
Piercing and sucking
✓ Correct
D
Chewing and biting
💡 Step-by-Step Explanation & Concept Rationale
Hemipteran stylets pierce plant vascular bundles to feed on nutrient-rich phloem sap.
Q. 3 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
The insecticidal protein in transgenic Bt cotton (Cry1Ac / Cry2Ab) is derived from:
A
Agrobacterium tumefaciens
B
Bacillus thuringiensis
✓ Correct
C
Bacillus subtilis
D
Escherichia coli
💡 Step-by-Step Explanation & Concept Rationale
Cry delta-endotoxin crystals bind to midgut receptors in susceptible lepidopteran larvae, lysing cells.
Q. 4 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Economic Threshold Level (ETL) in IPM is defined as:
A
The density where total crop failure occurs
B
The pest population density at which management action should be taken to prevent reaching EIL
✓ Correct
C
The cost of insecticide
D
Zero pest population
💡 Step-by-Step Explanation & Concept Rationale
ETL serves as an action trigger before pest numbers cause economic injury (EIL).
Q. 5 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Chrysoperla carnea (Green lacewing) is used in biological pest control as a:
A
Parasitoid wasp
B
Weed competitor
C
Voracious predator of aphids, whitefly nymphs, and eggs
✓ Correct
D
Pathogenic fungus
💡 Step-by-Step Explanation & Concept Rationale
Green lacewing larvae are aggressive generalist predators of soft-bodied agricultural pests.
Q. 6 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Which insecticide class acts as an acetylcholinesterase inhibitor in the insect nervous system?
A
Organophosphates and Carbamates
✓ Correct
B
Diamides
C
Neonicotinoids
D
Pyrethroids
💡 Step-by-Step Explanation & Concept Rationale
Inhibiting AChE causes continuous synaptic acetylcholine accumulation, causing paralysis and death.
Q. 7 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Pheromone traps utilize synthetic female sex pheromones primarily for:
A
Repelling birds
B
Killing all pests directly
C
Monitoring pest population dynamics and mating disruption
✓ Correct
D
Fertilizing plants
💡 Step-by-Step Explanation & Concept Rationale
Pheromones attract male moths to sticky traps to establish population thresholds and disrupt mating.
Q. 8 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Locust swarms (Schistocerca gregaria) belong to which insect order?
A
Coleoptera
B
Diptera
C
Hymenoptera
D
Orthoptera
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Desert locusts are Acrididae grasshoppers displaying solitaria and gregaria phase polymorphism.
Q. 9 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Honeybees (Apis mellifera) communicate food source direction and distance via the:
A
Stridor noise
B
Antenna tapping
C
Pheromone flight only
D
Waggle dance (figure-eight dance)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Karl von Frisch decoded the waggle dance, showing how angle relative to gravity encodes solar azimuth.
Q. 10 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Which pest is the primary vector of Citrus Tristeza Virus (CTV)?
A
Citrus leafminer
B
Fruit fly
C
Whitefly
D
Citrus aphid (Toxoptera citricida / Aphis gossypii)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Aphids transmit CTV non-persistently during phloem probing.
Q. 11 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In applied field conditions: Pink bollworm (Pectinophora gossypiella) causes damage in cotton by:
A
Nymphs sucking phloem sap
B
Root pruning
C
Larvae boring into squares and developing bolls, feeding on lint and seed
✓ Correct
D
Adults defoliating leaves
💡 Step-by-Step Explanation & Concept Rationale
Larval feeding inside cotton bolls leads to stained lint, hollow seeds, and rosetted blooms.
Q. 12 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In applied field conditions: Insects belonging to order Hemiptera (Aphids, Whiteflies) possess which type of mouthparts?
A
Piercing and sucking
✓ Correct
B
Sponging
C
Siphoning
D
Chewing and biting
💡 Step-by-Step Explanation & Concept Rationale
Hemipteran stylets pierce plant vascular bundles to feed on nutrient-rich phloem sap.
Q. 13 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In applied field conditions: The insecticidal protein in transgenic Bt cotton (Cry1Ac / Cry2Ab) is derived from:
A
Bacillus thuringiensis
✓ Correct
B
Bacillus subtilis
C
Escherichia coli
D
Agrobacterium tumefaciens
💡 Step-by-Step Explanation & Concept Rationale
Cry delta-endotoxin crystals bind to midgut receptors in susceptible lepidopteran larvae, lysing cells.
Q. 14 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In applied field conditions: Economic Threshold Level (ETL) in IPM is defined as:
A
Zero pest population
B
The pest population density at which management action should be taken to prevent reaching EIL
✓ Correct
C
The density where total crop failure occurs
D
The cost of insecticide
💡 Step-by-Step Explanation & Concept Rationale
ETL serves as an action trigger before pest numbers cause economic injury (EIL).
Q. 15 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In applied field conditions: Chrysoperla carnea (Green lacewing) is used in biological pest control as a:
A
Parasitoid wasp
B
Voracious predator of aphids, whitefly nymphs, and eggs
✓ Correct
C
Weed competitor
D
Pathogenic fungus
💡 Step-by-Step Explanation & Concept Rationale
Green lacewing larvae are aggressive generalist predators of soft-bodied agricultural pests.
Q. 16 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In applied field conditions: Which insecticide class acts as an acetylcholinesterase inhibitor in the insect nervous system?
A
Organophosphates and Carbamates
✓ Correct
B
Neonicotinoids
C
Pyrethroids
D
Diamides
💡 Step-by-Step Explanation & Concept Rationale
Inhibiting AChE causes continuous synaptic acetylcholine accumulation, causing paralysis and death.
Q. 17 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In applied field conditions: Pheromone traps utilize synthetic female sex pheromones primarily for:
A
Repelling birds
B
Killing all pests directly
C
Monitoring pest population dynamics and mating disruption
✓ Correct
D
Fertilizing plants
💡 Step-by-Step Explanation & Concept Rationale
Pheromones attract male moths to sticky traps to establish population thresholds and disrupt mating.
Q. 18 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In applied field conditions: Locust swarms (Schistocerca gregaria) belong to which insect order?
A
Coleoptera
B
Orthoptera
✓ Correct
C
Diptera
D
Hymenoptera
💡 Step-by-Step Explanation & Concept Rationale
Desert locusts are Acrididae grasshoppers displaying solitaria and gregaria phase polymorphism.
Q. 19 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In applied field conditions: Honeybees (Apis mellifera) communicate food source direction and distance via the:
A
Pheromone flight only
B
Antenna tapping
C
Waggle dance (figure-eight dance)
✓ Correct
D
Stridor noise
💡 Step-by-Step Explanation & Concept Rationale
Karl von Frisch decoded the waggle dance, showing how angle relative to gravity encodes solar azimuth.
Q. 20 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In applied field conditions: Which pest is the primary vector of Citrus Tristeza Virus (CTV)?
A
Fruit fly
B
Citrus leafminer
C
Whitefly
D
Citrus aphid (Toxoptera citricida / Aphis gossypii)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Aphids transmit CTV non-persistently during phloem probing.
Q. 21 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In agricultural practice: Pink bollworm (Pectinophora gossypiella) causes damage in cotton by:
A
Root pruning
B
Adults defoliating leaves
C
Nymphs sucking phloem sap
D
Larvae boring into squares and developing bolls, feeding on lint and seed
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Larval feeding inside cotton bolls leads to stained lint, hollow seeds, and rosetted blooms.
Q. 22 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In agricultural practice: Insects belonging to order Hemiptera (Aphids, Whiteflies) possess which type of mouthparts?
A
Piercing and sucking
✓ Correct
B
Chewing and biting
C
Siphoning
D
Sponging
💡 Step-by-Step Explanation & Concept Rationale
Hemipteran stylets pierce plant vascular bundles to feed on nutrient-rich phloem sap.
Q. 23 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In agricultural practice: The insecticidal protein in transgenic Bt cotton (Cry1Ac / Cry2Ab) is derived from:
A
Bacillus thuringiensis
✓ Correct
B
Bacillus subtilis
C
Escherichia coli
D
Agrobacterium tumefaciens
💡 Step-by-Step Explanation & Concept Rationale
Cry delta-endotoxin crystals bind to midgut receptors in susceptible lepidopteran larvae, lysing cells.
Q. 24 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In agricultural practice: Economic Threshold Level (ETL) in IPM is defined as:
A
The density where total crop failure occurs
B
The pest population density at which management action should be taken to prevent reaching EIL
✓ Correct
C
Zero pest population
D
The cost of insecticide
💡 Step-by-Step Explanation & Concept Rationale
ETL serves as an action trigger before pest numbers cause economic injury (EIL).
Q. 25 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In agricultural practice: Chrysoperla carnea (Green lacewing) is used in biological pest control as a:
A
Pathogenic fungus
B
Weed competitor
C
Voracious predator of aphids, whitefly nymphs, and eggs
✓ Correct
D
Parasitoid wasp
💡 Step-by-Step Explanation & Concept Rationale
Green lacewing larvae are aggressive generalist predators of soft-bodied agricultural pests.
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