Entomology – Study of Insects MCQs
Part 1 — Entomology MCQs (Q1–Q25)
Q1. Insects belong to which phylum?
A. Arthropoda ✅
• Insects are arthropods with jointed appendages and an exoskeleton.
B. Mollusca
• Soft-bodied, non-jointed; includes snails, not insects.
C. Annelida
• Segmented worms; lack jointed legs.
D. Chordata
• Vertebrates and relatives; insects are invertebrates.
Q2. The defining body plan of insects includes:
A. Two body regions and six legs
• Two regions fits spiders (chelicerates).
B. Three body regions (head, thorax, abdomen) and three pairs of legs ✅
• Classic insect plan.
C. Four body regions and eight legs
• Not insects.
D. Head–thorax only
• Abdomen is always present.
Q3. The insect exoskeleton is primarily composed of:
A. Cellulose
• Plant polymer.
B. Chitin with sclerotized proteins ✅
• Chitin microfibrils embedded in protein matrix.
C. Collagen
• Animal connective tissue, not cuticle.
D. Keratin
• Vertebrate hair/feathers, not insect cuticle.
Q4. The insect respiratory system is:
A. Lungs connected to blood
• Insects lack lungs.
B. Tracheal tubes delivering air directly to tissues via spiracles ✅
• Gas exchange largely independent of hemolymph.
C. Gills only
• Aquatic nymphs may have gills, but not general system.
D. Skin diffusion only
• Too inefficient for active insects.
Q5. Hemolymph in insects primarily functions to:
A. Carry most oxygen
• O₂ mostly via tracheae.
B. Transport nutrients, hormones, immune cells (hemocytes) ✅
• Open circulatory system.
C. Conduct nerve impulses
• Done by neurons.
D. Produce cuticle
• Epidermis secretes cuticle.
Q6. The Malpighian tubules are involved in:
A. Digestion of proteins
• Midgut handles most digestion.
B. Excretion/osmoregulation—removing nitrogenous wastes ✅
• Analogous to kidneys.
C. Gas exchange
• Tracheal system does this.
D. Flight muscle cooling
• Not their role.
Q7. Ecdysone in insects is a hormone that:
A. Triggers molting and metamorphosis ✅
• Steroid hormone from prothoracic glands.
B. Maintains juvenile characteristics
• That’s juvenile hormone (JH).
C. Controls circadian rhythm
• Pigment-dispersing hormones do; not ecdysone.
D. Regulates heartbeat
• Neurohormones regulate, not ecdysone directly.
Q8. Holometabolous development includes:
A. Egg → nymph → adult
• That’s hemimetabolous.
B. Direct development with no change
• Ametabolous.
C. Egg → larva → pupa → adult ✅
• Complete metamorphosis (e.g., Lepidoptera).
D. Egg → larva → adult (no pupa)
• Incomplete.
Q9. The elytra are found in:
A. Coleoptera (beetles) ✅
• Hardened forewings protecting hindwings.
B. Diptera
• Flies have halteres, not elytra.
C. Odonata
• Dragonflies with two membranous wing pairs.
D. Hymenoptera
• Bees/ants/wasps lack elytra.
Q10. Halteres serve as:
A. Sound-producing organs
• Stridulation is different.
B. Gyroscopic balancing organs in Diptera ✅
• Modified hindwings aiding flight stability.
C. Scent glands
• Not halteres.
D. Egg-laying structures
• That’s ovipositor.
Q11. Piercing–sucking mouthparts are characteristic of:
A. Mosquitoes and aphids ✅
• Stylets pierce tissues to suck fluids.
B. Grasshoppers
• Chewing mouthparts.
C. Butterflies
• Siphoning proboscis.
D. Houseflies
• Sponging/lapping.
Q12. The Johnston’s organ is located in:
A. Tarsi
• Feet; mechanoreception present but not Johnston’s organ.
B. Antenna (pedicel), detects sound/vibration ✅
• Key in mosquitoes/males for flight tone.
C. Wings
• Campaniform sensilla instead.
D. Ocelli
• Simple eyes; light detection.
Q13. The primary visual organs in most adult insects are:
A. Ocelli only
• Simple eyes for light level, not image.
B. Compound eyes (ommatidia) for image formation ✅
• Mosaic vision; ocelli supplement.
C. Lateral line
• Fish structure.
D. Pit organs
• Some arthropods, not general.
Q14. Juvenile hormone (JH) maintains:
A. Immediate adult molt
• Opposite; high JH prevents adult differentiation.
B. Larval characteristics; modulates metamorphosis and reproduction ✅
• Decline in JH allows pupation/adult.
C. Only diapause
• JH can influence diapause but not solely.
D. Wing development only
• Broader endocrine role.
Q15. Ametabolous insects are best exemplified by:
A. Butterflies
• Holometabolous.
B. Silverfish (Zygentoma) ✅
• No metamorphosis; juveniles resemble adults.
C. Grasshoppers
• Hemimetabolous.
D. Beetles
• Holometabolous.
Q16. The foregut of insects is lined with:
A. None—no lining
• Incorrect.
B. Cuticle (intima), like hindgut ✅
• Midgut lacks cuticle; site of absorption.
C. Peritrophic matrix only
• PM occurs in midgut lumen.
D. Endoderm-derived epithelium with cuticle
• Midgut is endoderm; foregut/hindgut ectodermal + cuticle.
Q17. Tracheoles end near tissues to:
A. Pump hemolymph
• Not their function.
B. Allow direct diffusion of gases to cells ✅
• Very fine, close to mitochondria.
C. Carry nutrients
• Hemolymph carries nutrients.
D. Regulate hormones
• Endocrine system does.
Q18. Spermatheca in female insects is used to:
A. Produce eggs
• Ovaries do that.
B. Store sperm after mating for later fertilization ✅
• Enables controlled fertilization timing.
C. Nourish larvae
• Accessory glands/others do.
D. Determine sex genetically
• Sex determination is chromosomal/haplodiploid.
Q19. Haplodiploidy (common in Hymenoptera) means:
A. Males and females both diploid
• Not the system.
B. Males are haploid (from unfertilized eggs), females diploid ✅
• Basis of eusocial kin structure.
C. Females are haploid only
• Incorrect.
D. Sex determined by temperature
• Applies to reptiles, not bees/ants.
Q20. A parasitoid differs from a parasite because it:
A. Never harms the host
• Parasitoids kill host.
B. Eventually kills the host as part of development ✅
• Key in biological control (e.g., Trichogramma).
C. Is always vertebrate
• Parasitoids are usually insects.
D. Is obligate blood-feeder
• Not necessarily.
Q21. Vector competence refers to:
A. Population size of vectors
• Demography, not competence.
B. Intrinsic ability of an insect to acquire, maintain, and transmit a pathogen ✅
• Includes barriers in midgut/salivary glands.
C. Host immunity
• Host trait, not vector.
D. Insecticide dose
• Control factor, not competence.
Q22. Dengue virus is primarily transmitted by:
A. Anopheles mosquitoes
• Malaria vectors.
B. Aedes aegypti / Aedes albopictus ✅
• Day-biting urban vectors.
C. Culex mosquitoes
• West Nile/JEV vectors.
D. Sand flies
• Leishmaniasis vectors.
Q23. Diapause is:
A. Immediate death in winter
• Not true.
B. Programmed developmental arrest with metabolic suppression ✅
• Photoperiod/temperature regulated.
C. Random inactivity
• Highly regulated, not random.
D. Torpor due to dehydration only
• Multiple cues, not just dehydration.
Q24. In Integrated Pest Management (IPM), the economic threshold (ET) is:
A. Lowest density ever observed
• Not meaningful.
B. Pest density at which control must be applied to prevent reaching EIL ✅
• EIL = Economic Injury Level.
C. Density causing maximum yield
• Opposite.
D. A fixed number for all crops
• ET varies with crop/pest/economics.
Q25. Pyrethroids act on insect:
A. AChE enzyme inhibition
• That’s organophosphates/carbamates.
B. Voltage-gated sodium channels—prolonged opening → paralysis ✅
• Knockdown effect; resistance via kdr mutations.
C. GABA receptors only
• Cyclodienes/Fipronil target GABA.
D. Chitin synthesis
• Benzoylureas (IGRs) inhibit chitin.
Part 2 — Entomology MCQs (Q26–Q50)
Q26. Insects of order Lepidoptera include:
A. Beetles
• Order Coleoptera.
B. Butterflies and moths ✅
• Wings covered with scales (lepido = scale, ptera = wings).
C. Mosquitoes
• Order Diptera.
D. Grasshoppers
• Order Orthoptera.
Q27. Orthoptera are characterized by:
A. Piercing–sucking mouthparts
• Hemiptera.
B. Chewing mouthparts and saltatorial hind legs ✅
• Grasshoppers, locusts, crickets.
C. Scaled wings
• Lepidoptera.
D. Halteres
• Diptera.
Q28. Diptera insects are unique because they:
A. Have two pairs of membranous wings
• Odonata (dragonflies).
B. Have one pair of wings, hind pair modified into halteres ✅
• Flies, mosquitoes.
C. Possess chewing mouthparts only
• Many have piercing/sucking.
D. Have elytra
• Coleoptera.
Q29. The order Hymenoptera includes:
A. Bees, ants, wasps ✅
• Social insects with haplodiploidy.
B. Butterflies
• Lepidoptera.
C. Cockroaches
• Blattodea.
D. Houseflies
• Diptera.
Q30. Hemiptera (true bugs) are distinct because they:
A. Have elytra
• Coleoptera.
B. Have piercing–sucking beaklike mouthparts, forewings partly leathery ✅
• Half-wing structure (hemi = half).
C. Possess halteres
• Diptera.
D. Exhibit complete metamorphosis
• Hemiptera are hemimetabolous.
Q31. Odonata (dragonflies, damselflies) nymphs are unique because they:
A. Lack mouthparts
• False.
B. Are aquatic with extendable labium (“mask”) for catching prey ✅
• Specialized predatory organ.
C. Have halteres
• Not odonates.
D. Have pupal stage
• Hemimetabolous, no pupae.
Q32. Blattodea includes:
A. Grasshoppers
• Orthoptera.
B. Cockroaches and termites ✅
• Now termites included (molecular evidence).
C. Ants
• Hymenoptera.
D. Lice
• Phthiraptera.
Q33. The insect organ that produces sound (stridulation) in crickets is:
A. Antennae
• Sensory.
B. Forewings rubbed together (tegmina) ✅
• File and scraper mechanism.
C. Legs tapping ground
• Not primary method.
D. Mouthparts
• Not sound-producing.
Q34. Pheromones in insects are used for:
A. Feeding only
• Not main use.
B. Communication (mating, trail marking, alarm, aggregation) ✅
• Chemical messengers.
C. Storing nutrients
• Not true.
D. Excretion
• Not relevant.
Q35. The Waggle dance in honeybees conveys:
A. Presence of predators
• Alarm pheromones do this.
B. Direction and distance of food source relative to sun ✅
• Discovered by Karl von Frisch.
C. Hive temperature
• Regulated separately.
D. Egg-laying sites
• Queen chooses.
Q36. Apiculture refers to:
A. Silkworm rearing
• Sericulture.
B. Lac insect rearing
• Lac culture.
C. Beekeeping for honey and pollination ✅
• Apis = bee.
D. Fish farming
• Pisciculture.
Q37. Sericulture is based on:
A. Honeybees
• Wrong.
B. Silkworms (Bombyx mori) producing silk ✅
• Domesticated for thousands of years.
C. Lac insects
• Lac culture.
D. Termites
• No commercial use.
Q38. The lac used in varnishes and polishes is secreted by:
A. Silkworm
• Produces silk.
B. Honeybee
• Produces honey/wax.
C. Lac insect (Kerria lacca) ✅
• Scale insect secreting resin.
D. Termite
• No lac.
Q39. Vector of malaria is:
A. Culex mosquito
• West Nile, filariasis.
B. Aedes mosquito
• Dengue, chikungunya, Zika.
C. Female Anopheles mosquito ✅
• Transmits Plasmodium.
D. Sand fly
• Leishmaniasis vector.
Q40. Sand flies (Phlebotomus spp.) transmit:
A. Malaria
• Mosquito-borne.
B. Leishmaniasis (kala-azar) ✅
• Protozoan disease.
C. Sleeping sickness
• Tsetse flies transmit.
D. Dengue
• Aedes mosquitoes.
Q41. Glossina (tsetse fly) transmits:
A. Dengue
• Aedes.
B. Malaria
• Anopheles.
C. African sleeping sickness (Trypanosoma brucei) ✅
• Via salivary transmission.
D. Leishmaniasis
• Sand flies.
Q42. The main vector of Chagas disease in Latin America is:
A. Mosquitoes
• Not correct.
B. Triatomine bugs (“kissing bugs”) ✅
• Transmit Trypanosoma cruzi.
C. Sand flies
• Leishmaniasis.
D. Blackflies
• Onchocerciasis.
Q43. Onchocerciasis (river blindness) is transmitted by:
A. Blackflies (Simulium) ✅
• Larvae develop in fast-flowing rivers.
B. Tsetse flies
• Sleeping sickness.
C. Mosquitoes
• Not this disease.
D. Fleas
• Not vector here.
Q44. Myiasis is caused by:
A. Ticks
• Arachnids, not myiasis.
B. Fly larvae (maggots) infesting live tissues ✅
• E.g., Cochliomyia, Dermatobia.
C. Beetle larvae
• Not myiasis agents.
D. Mosquito larvae
• Aquatic, not parasitic.
Q45. Integrated Pest Management (IPM) emphasizes:
A. Combination of biological, cultural, genetic, and chemical methods ✅
• Reduce pesticide reliance.
B. Exclusive pesticide use
• Opposite of IPM.
C. Ignoring economic thresholds
• ET central to IPM.
D. Eliminating all pests
• Goal is management, not eradication.
Q46. The Sterile Insect Technique (SIT) works by:
A. Killing pests with insecticides
• Chemical method, not SIT.
B. Releasing sterilized males to reduce reproduction ✅
• Used against screwworm, fruit flies.
C. Using pheromones only
• Not SIT.
D. Using predators
• Biological control, not SIT.
Q47. Biological control of pests involves:
A. Only spraying insecticides
• Chemical, not biological.
B. Using natural enemies (parasitoids, predators, pathogens) ✅
• Sustainable alternative.
C. Starving crops
• Not control method.
D. Mechanical traps only
• Part of IPM, not main biological method.
Q48. Resistance to organophosphates in insects often involves:
A. Reduced cuticle penetration
• Plays role but not primary.
B. Mutations or overexpression of acetylcholinesterase (AChE) ✅
• Target-site insensitivity.
C. Extra wings
• Not relevant.
D. Stronger spiracles
• Not related.
Q49. Bt toxin is produced by:
A. Virus
• Baculoviruses used separately.
B. Bacterium Bacillus thuringiensis ✅
• δ-endotoxins toxic to insect midgut.
C. Fungi
• Entomopathogens exist, but not Bt.
D. Protozoa
• Not Bt source.
Q50. The mode of action of Bt toxin is:
A. Blocking AChE
• Not correct.
B. Binding to insect midgut receptors → pore formation → cell lysis ✅
• Specific to larvae of Lepidoptera, Coleoptera, Diptera.
C. Blocking GABA receptors
• Different toxins.
D. Paralyzing flight muscles directly
• Not mechanism.
Part 3 — Entomology MCQs (Q51–Q75)
Q51. The insect nervous system consists of:
A. Brain only
• Insects have more distributed control.
B. Brain + ventral nerve cord with ganglia ✅
• Decentralized control; thoracic ganglia regulate wings/legs.
C. Spinal cord and brain
• Vertebrates, not insects.
D. Dorsal nerve cord
• Found in chordates; insects have ventral.
Q52. The compound eye is made up of:
A. Retina cells only
• Too simple.
B. Ommatidia, each functioning as an individual photoreceptive unit ✅
• Together form mosaic vision.
C. Only one lens
• Many lenses present.
D. Ocelli
• Separate simple eyes.
Q53. The pigment that helps insects detect polarized light is:
A. Hemocyanin
• Respiratory pigment in crustaceans.
B. Rhodopsin (visual pigment) ✅
• Specialized for light direction and polarization.
C. Melanin
• Pigment for color, not light sensing.
D. Carotenoids
• For coloration, not vision.
Q54. Mechanoreceptors in insects detect:
A. Chemicals
• Chemoreceptors do that.
B. Touch, pressure, vibration, sound ✅
• Sensilla (trichoid, campaniform, chordotonal organs).
C. Light
• Photoreceptors detect light.
D. Hormones
• Not detected directly.
Q55. Chemoreceptors in insects are mostly found on:
A. Wings only
• Rare.
B. Antennae, mouthparts, tarsi (taste, smell) ✅
• Detect pheromones, host plants.
C. Spiracles
• Gas exchange, not sensory.
D. Cuticle plates
• Provide protection, not chemoreception.
Q56. Insect cuticle layers from outer to inner are:
A. Epicuticle → exocuticle → endocuticle → epidermis ✅
• Epicuticle waxy, exo/endocuticle structural, epidermis secretes.
B. Exocuticle → endocuticle → epidermis → epicuticle
• Wrong order.
C. Epidermis → cuticle → muscles only
• Too simplified.
D. Chitin only
• Cuticle has protein + chitin + lipids.
Q57. Fat body in insects is analogous to:
A. Brain
• Not related.
B. Liver + adipose tissue (metabolism, storage, detoxification) ✅
• Central metabolic organ.
C. Kidney
• Excretion is by Malpighian tubules.
D. Pancreas
• Digestive enzymes mainly midgut.
Q58. Forensic entomology uses insects mainly to:
A. Treat diseases
• Not the field.
B. Estimate post-mortem interval (PMI) using carrion insects ✅
• Blowflies/dermestids colonize corpses in predictable sequence.
C. Harvest silk
• That’s sericulture.
D. Trap pests
• Different application.
Q59. The first insects to colonize corpses in most cases are:
A. Ants
• May arrive later.
B. Blowflies (Calliphoridae) ✅
• Lay eggs within hours of death.
C. Beetles
• Appear later in decomposition.
D. Moths
• Not carrion feeders.
Q60. Pollination by insects is called:
A. Anemophily
• Wind pollination.
B. Hydrophily
• Water pollination.
C. Entomophily ✅
• Insect-mediated pollination.
D. Zoophily
• Animal pollination more broadly.
Q61. The most important pollinators worldwide are:
A. Butterflies
• Pollinators, but less efficient.
B. Honeybees and wild bees ✅
• Critical for crop pollination.
C. Moths
• Nocturnal pollinators, but not dominant.
D. Beetles only
• Important for some plants, not overall.
Q62. Co-evolution between plants and insects is exemplified by:
A. Passive dispersal only
• Not interactive.
B. Specialized flowers adapted to specific insect pollinators ✅
• Long-tongued moths & deep corolla flowers.
C. Seed dispersal by wind
• Non-insect.
D. Photosynthesis
• Plant metabolism, not coevolutionary.
Q63. Insect wings are derived evolutionarily from:
A. Gills of crustaceans (paranotal + gill theory combined) ✅
• Supported by genetic studies.
B. Legs of spiders
• Not supported.
C. Vertebrate limbs
• Wrong phylum.
D. Cuticle only
• Insufficient.
Q64. Wing coupling apparatus is found in:
A. Diptera
• Hindwings reduced to halteres.
B. Lepidoptera (moths/butterflies) & Hymenoptera (bees/wasps) ✅
• Fore- and hindwings hooked together.
C. Coleoptera
• Forewings hardened, not coupled.
D. Orthoptera
• Not coupled.
Q65. The insect heart pumps hemolymph:
A. Dorsally, from posterior to anterior ✅
• Through dorsal vessel, into head.
B. Ventral, anterior to posterior
• Wrong orientation.
C. Through veins and arteries
• Open system, lacks closed vessels.
D. With valves like vertebrate heart
• Has ostia, but no closed circuits.
Q66. Ovipositor is used for:
A. Egg-laying in specific sites (soil, plants, hosts) ✅
• Needle-like organ in many females.
B. Injecting venom only
• Ovipositor modified into stingers in wasps/bees.
C. Breathing tube
• Spiracles, not ovipositor.
D. Copulation
• Male genitalia, not ovipositor.
Q67. Polyembryony in insects means:
A. Producing multiple species at once
• Impossible.
B. One egg → multiple genetically identical embryos ✅
• Seen in parasitic Hymenoptera.
C. Multiple matings
• Polyandry, not polyembryony.
D. Alternating generations
• Parthenogenesis/heterogony, not polyembryony.
Q68. Parthenogenesis is:
A. Reproduction requiring fertilization
• Not true.
B. Development of offspring from unfertilized eggs ✅
• Common in aphids, stick insects.
C. Only in mammals
• Extremely rare in mammals.
D. Identical to cloning
• Similar, but not artificial cloning.
Q69. Viviparity in insects refers to:
A. Egg-laying only
• That’s oviparity.
B. Giving birth to live young (larvae/nymphs) ✅
• Some Diptera, cockroaches.
C. Alternation of generations
• Different concept.
D. Producing resistant cysts
• Not viviparity.
Q70. Sex pheromones in pest management are used for:
A. Killing directly
• Non-lethal.
B. Trapping/mating disruption to reduce reproduction ✅
• Used in IPM (e.g., moth pests).
C. Increasing pest feeding
• Not desired.
D. Strengthening cuticle
• Irrelevant.
Q71. Resurgence in pest populations after insecticide use occurs due to:
A. No reproduction
• Opposite.
B. Killing of natural enemies and resistance development ✅
• Pests rebound strongly.
C. Reduced oviposition
• Not resurgence.
D. Lack of food
• Doesn’t cause resurgence.
Q72. Insecticide resistance mechanisms include:
A. Target-site mutations
• Yes.
B. Increased detoxification enzymes
• Yes.
C. Reduced penetration
• Yes.
D. All of the above ✅
• Multiple mechanisms contribute.
Q73. Entomopathogenic fungi include:
A. Bacillus thuringiensis
• Bacterium.
B. Beauveria, Metarhizium species ✅
• Biocontrol fungi infecting insects.
C. Viruses
• Baculoviruses are different agents.
D. Protozoa
• Nosema, but not fungi.
Q74. Insect–plant interactions include:
A. Pollination
• Yes.
B. Herbivory
• Yes.
C. Seed dispersal
• Some ants (myrmecochory).
D. All of the above ✅
• Multiple interaction modes.
Q75. Cryoprotectants in overwintering insects help by:
A. Increasing oxygen uptake
• Not relevant.
B. Preventing ice crystal damage in tissues ✅
• Glycerol, trehalose stabilize cells.
C. Speeding metamorphosis
• Not role.
D. Increasing reproduction
• Not role.
Part 4 — Entomology MCQs (Q76–Q100)
Q76. The term eusociality refers to:
A. Random colony behavior
• Not correct.
B. Cooperative brood care, reproductive division of labor, overlapping generations ✅
• Seen in ants, bees, termites.
C. Only temporary aggregations
• Not eusocial.
D. Cannibalism in colonies
• Not defining.
Q77. Caste determination in honeybees is influenced by:
A. Genetics only
• Plays role but not sole factor.
B. Diet (royal jelly for queen, worker diet otherwise) ✅
• Nutrition regulates endocrine pathways.
C. Sunlight exposure
• Not primary factor.
D. Random chance
• Not true.
Q78. Termites are unique among insects because they:
A. Are solitary
• They are social.
B. Digest cellulose with help of gut symbionts ✅
• Protozoa/bacteria assist in cellulose digestion.
C. Lack caste system
• They are eusocial with castes.
D. Lack metamorphosis
• They are hemimetabolous.
Q79. Entomophagy refers to:
A. Eating plants
• Herbivory.
B. Consumption of insects as food ✅
• Nutrient-rich, sustainable protein source.
C. Insects eating fungi
• Mycophagy.
D. Insects eating each other
• Cannibalism.
Q80. Desert locust (Schistocerca gregaria) outbreaks are triggered by:
A. Lack of rain
• Opposite; rains promote vegetation.
B. High rainfall and crowding → gregarization and swarming ✅
• Phase polyphenism leads to plagues.
C. Cold temperatures
• Not relevant.
D. Predation by birds
• Natural control, not outbreak cause.
Q81. The primary vector of plague (Yersinia pestis) is:
A. Flea (Xenopsylla cheopis) ✅
• Classic vector in pandemics.
B. Mosquito
• Not plague.
C. Louse
• Typhus, not plague.
D. Tick
• Transmit rickettsial, not plague mainly.
Q82. Pediculus humanus (human louse) transmits:
A. Malaria
• Mosquitoes.
B. Epidemic typhus (Rickettsia prowazekii) ✅
• Louse-borne disease in humans.
C. Dengue
• Aedes mosquito.
D. Kala-azar
• Sand flies.
Q83. Wolbachia bacteria are important in entomology because they:
A. Harm all insects equally
• Not true.
B. Manipulate insect reproduction (e.g., cytoplasmic incompatibility) and reduce vector competence ✅
• Used in vector control.
C. Are insect hormones
• They are bacteria.
D. Only infect vertebrates
• False.
Q84. The Sterile Insect Technique (SIT) is most successful against:
A. Honeybees
• Not pests.
B. Screwworms and fruit flies ✅
• Classic eradication programs.
C. Mosquitoes only
• Trial use, not primary success.
D. Termites
• Not SIT.
Q85. The insect circulatory system is:
A. Closed like vertebrates
• Not true.
B. Open hemocoel system with dorsal vessel ✅
• Hemolymph bathes tissues.
C. Powered by lungs
• Insects lack lungs.
D. Powered by veins
• No closed veins.
Q86. Endocrine control of molting involves:
A. Juvenile hormone only
• JH modulates, but not initiates.
B. Ecdysone from prothoracic glands initiates molting ✅
• JH determines type of molt.
C. Insulin only
• Not molting hormone.
D. None of these
• Incorrect.
Q87. Biological clocks in insects are regulated by:
A. Spiracles
• Not relevant.
B. Neurohormones and specialized photoreceptors ✅
• Control circadian rhythms and diapause.
C. Ommatidia only
• Not sufficient.
D. Antennae vibrations
• Not timekeeping.
Q88. Polyphagous pests feed on:
A. A single host plant
• Monophagous.
B. Few related plants
• Oligophagous.
C. Many unrelated host plants ✅
• Example: locusts, Spodoptera.
D. Only one insect
• Not feeding mode.
Q89. Cry genes used in Bt crops are cloned from:
A. Viruses
• Not Cry.
B. Bacillus thuringiensis ✅
• Encode insecticidal crystal proteins.
C. Fungi
• Not Cry.
D. Protozoa
• Not Cry.
Q90. RNAi-based pest control works by:
A. Spraying proteins
• Not effective.
B. Silencing essential insect genes via double-stranded RNA ✅
• Leads to mortality or sterility.
C. Adding hormones
• Different approach.
D. Killing with electricity
• Not RNAi.
Q91. Climate change threatens insect biodiversity mainly by:
A. Reducing pesticide use
• Not direct.
B. Shifting ranges, disrupting phenology, increasing pest outbreaks ✅
• Alters life cycles & ecosystems.
C. Eliminating forests only
• Broader impacts.
D. Increasing diapause only
• Not universally.
Q92. Conservation of pollinators includes:
A. Habitat destruction
• Opposite.
B. Protecting wildflower diversity, reducing pesticides, supporting bee colonies ✅
• Ensures ecosystem services.
C. Introducing invasive species
• Dangerous.
D. Ignoring IPM
• Opposite to conservation.
Q93. Insecticide resistance genes are often studied using:
A. PCR and sequencing ✅
• Detect mutations in target sites (e.g., kdr in sodium channel).
B. Microscopy only
• Cannot identify resistance genes.
C. ELISA for proteins only
• Not DNA level.
D. Wing venation study
• Morphology, not genes.
Q94. The insect group Collembola (springtails) are:
A. True insects with wings
• Wingless.
B. Primitive hexapods, wingless, ametabolous ✅
• Close relatives of insects, soil dwellers.
C. Crustaceans
• Not Collembola.
D. Arachnids
• Not correct.
Q95. Mantodea (praying mantids) are important in agriculture because they:
A. Damage crops
• Not pests.
B. Act as beneficial predators of pest insects ✅
• Natural enemies, used in biocontrol.
C. Produce silk
• Silkworms, not mantids.
D. Transmit diseases
• Not vectors.
Q96. Drosophila melanogaster is a model organism because:
A. Complex genome only
• Simple genome actually.
B. Short life cycle, genetic tractability, conserved pathways ✅
• Widely used in genetics/biomedicine.
C. Largest insect
• Tiny.
D. Pest only
• Used mainly for research.
Q97. Lucilia sericata (green bottle fly) larvae are used in:
A. Spreading disease
• Blowflies can, but not this use.
B. Maggot therapy to clean necrotic wounds ✅
• Sterile larvae remove dead tissue.
C. Producing silk
• Not correct.
D. Pollination
• Not primary role.
Q98. Cryolite dusting in history was used to control:
A. Colorado potato beetle ✅
• Early inorganic insecticide.
B. Mosquitoes
• Not used.
C. Termites
• Wrong.
D. Fleas
• Not this.
Q99. Phytophagous insects feed on:
A. Other insects
• Carnivory.
B. Fungi
• Mycophagy.
C. Plants (herbivory) ✅
• Majority of insect diversity.
D. Detritus
• Detritivory.
Q100. The future of entomology in pest control involves:
A. Exclusive pesticide use
• Unsustainable.
B. Integrated genomics, RNAi, CRISPR-based gene drives, biocontrol, and IPM ✅
• Sustainable and precise methods.
C. Eliminating natural enemies
• Opposite strategy.
D. Ignoring climate change
• Cannot succeed.
entomology mcqs for cbse board exams, entomology objective questions for icse students, entomology mcqs for neet preparation, entomology practice questions for cuet ug pg, entomology mcqs for csir net life sciences, entomology questions for gate biotechnology exam, entomology mcqs with explanations for dbt bet jrf, entomology mcqs for usmle step 1 preparation, entomology practice questions for plab exam, entomology mcqs for amc medical licensing, entomology multiple choice questions for sat biology subject test, entomology practice test gre biology subject exam, entomology mcqs for bmat entrance preparation, entomology objective questions for imat exam practice
