Entomology: Insect Morphology, Classification and Life Cycles MCQs 2026

Cockroaches belong to the order

1. ADiptera✓
2. BBlattodea✓
3. CLepidoptera✓
4. DColeoptera✓

True bugs belong to the order

1. AOrthoptera✓
2. BOdonata✓
3. CHemiptera✓
4. DThysanoptera✓

Beetles belong to the order

1. AHymenoptera✓
2. BNeuroptera✓
3. CIsoptera✓
4. DColeoptera✓

Flies with one pair of functional wings belong to the order

1. ADiptera✓
2. BLepidoptera✓
3. CColeoptera✓
4. DHemiptera✓

The insect body is divided into three main regions called

1. Ahead, thorax and abdomen✓
2. Bcephalothorax, tail and foot✓
3. Croot, stem and leaf✓
4. Dshell, mantle and foot✓

The number of legs in an adult insect is

1. Atwo pairs✓
2. Bthree pairs✓
3. Cfour pairs✓
4. Dfive pairs✓

Insect antennae function primarily as

1. Awalking appendages✓
2. Brespiratory tubes✓
3. Csensory organs✓
4. Ddigestive glands✓

The outer skeleton of insects is mainly composed of

1. Acellulose✓
2. Bkeratin✓
3. Csilica✓
4. Dchitin✓

The insect thorax bears the

1. Alegs and wings✓
2. Bmouthparts and antennae only✓
3. Covaries and Malpighian tubules only✓
4. Dcerci and spiracles only✓

Mandibulate mouthparts are primarily adapted for

1. Asiphoning nectar only✓
2. Bchewing✓
3. Cpiercing and sucking only✓
4. Dsponging liquid only✓

Siphoning mouthparts are characteristic of adult

1. Atermites and lice✓
2. Bgrasshoppers and crickets✓
3. Cbutterflies and moths✓
4. Dbeetle larvae only✓

Piercing-sucking mouthparts are typical of

1. Ahoneybee workers only✓
2. Bdragonfly adults only✓
3. Csilkworm pupae only✓
4. Daphids and mosquitoes✓

A compound eye is made up of many units called

1. Aommatidia✓
2. Bspiracles✓
3. Ctergites✓
4. Delytra✓

Simple eyes of many insects are called

1. Acerci✓
2. Bocelli✓
3. Cpalps✓
4. Dclaspers✓

The main respiratory openings on the insect body are

1. Anephridia✓
2. Bstomata✓
3. Cspiracles✓
4. Dalveoli✓

Insects conduct respiration through a system of

1. Alungs✓
2. Bgills only✓
3. Cbook lungs only✓
4. Dtracheae✓

The open circulatory fluid of insects is called

1. Ahemolymph✓
2. Bplasma sap✓
3. Clymph node fluid✓
4. Dxylem water✓

Malpighian tubules function mainly in

1. Asound production only✓
2. Bexcretion and osmoregulation✓
3. Cwing folding only✓
4. Degg fertilization only✓

The insect nervous system includes a ventral

1. Anotochord✓
2. Bspinal column✓
3. Cnerve cord✓
4. Dmycelial strand✓

Complete metamorphosis is termed

1. Aametabolous development✓
2. Bpaurometabolous development✓
3. Cdirect segmentation✓
4. Dholometabolous development✓

Incomplete metamorphosis is termed

1. Ahemimetabolous development✓
2. Bholometabolous development✓
3. Cembryogenesis only✓
4. Ddiapause development✓

The immature stage of a grasshopper is called a

1. Amaggot✓
2. Bnymph✓
3. Cpupa✓
4. Dgrub✓

The immature feeding stage of a butterfly is called a

1. Anymph only✓
2. Badult worker✓
3. Clarva or caterpillar✓
4. Dpuparium✓

The resting transformative stage in holometabolous insects is the

1. Anymph✓
2. Bcrawler✓
3. Cqueen✓
4. Dpupa✓

An egg, larva, pupa and adult sequence occurs in

1. Acomplete metamorphosis✓
2. Bsimple cell division✓
3. Cdirect seed germination✓
4. Dincomplete digestion✓

Moths and butterflies belong to the order

1. ABlattodea✓
2. BLepidoptera✓
3. CDermaptera✓
4. DPhasmatodea✓

Bees, wasps and ants belong to the order

1. ADiptera✓
2. BHemiptera✓
3. CHymenoptera✓
4. DOrthoptera✓

Grasshoppers and crickets belong to the order

1. AOdonata✓
2. BColeoptera✓
3. CSiphonaptera✓
4. DOrthoptera✓

Dragonflies and damselflies belong to the order

1. AOdonata✓
2. BMantodea✓
3. CDiptera✓
4. DPlecoptera✓

The hardened forewings of beetles are called

1. Ahalteres✓
2. Belytra✓
3. Ccerci✓
4. Docelli✓

The balancing organs of true flies are called

1. Amandibles✓
2. Bmaxillae✓
3. Chalteres✓
4. Dtegmina✓

The triangular dorsal plate between wing bases of many hemipterans is the

1. Aclypeus✓
2. Bscape✓
3. Cpretarsus✓
4. Dscutellum✓

The tarsus is part of the insect

1. Aleg✓
2. Bantenna✓
3. Cwing vein✓
4. Ddigestive tract✓

The paired terminal abdominal appendages in many insects are called

1. Apalpi✓
2. Bcerci✓
3. Cspiracles✓
4. Dmandibles✓

A geniculate antenna is best described as

1. Afeather-like✓
2. Bsaw-like✓
3. Celbowed✓
4. Dthread-like without bends✓

A plumose antenna is

1. Aclubbed at the end✓
2. Bshort and bristle-like✓
3. Celbowed with a long scape✓
4. Dfeather-like✓

Setaceous antennae are

1. Abristle-like✓
2. Bcomb-like✓
3. Cleaf-like✓
4. Delbowed and clubbed✓

Clavate antennae are

1. Aflat and leaf-like along the full length✓
2. Bgradually clubbed toward the tip✓
3. Cfeather-like with long branches✓
4. Dreduced to a single spine✓

The hardened dorsal plates of insect segments are called

1. Asternites✓
2. Bpleurites✓
3. Ctergites✓
4. Dspiracles✓

The ventral plates of insect segments are called

1. Atergites✓
2. Belytra✓
3. Cocelli✓
4. Dsternites✓

The lateral plates of insect segments are called

1. Apleurites✓
2. Btergites✓
3. Csternites✓
4. Dlabella✓

Molting in insects is controlled mainly by the hormone

1. Ainsulin✓
2. Becdysone✓
3. Cthyroxine✓
4. Dadrenaline✓

Juvenile hormone generally maintains

1. Awing venation only✓
2. Begg shell hardness only✓
3. Cimmature characters✓
4. Dadult diapause only✓

The developmental stage between two molts is an

1. Aocellus✓
2. Belytron✓
3. Covariole✓
4. Dinstar✓

The shed old cuticle after molting is called

1. Aexuviae✓
2. Bchorion✓
3. Cfrass✓
4. Dhoneydew✓

Diapause in insects is best defined as

1. Aa type of chewing mouthpart✓
2. Ba hormonally regulated dormancy✓
3. Ca bacterial disease of larvae✓
4. Da wing vein pattern only✓

Ametabolous development is characterized by

1. Acomplete metamorphosis with pupae✓
2. Bnymphs with wing pads only✓
3. Cabsence of metamorphosis✓
4. Dadult emergence from a puparium✓

Paurometabolous insects have nymphs that

1. Aare maggots without legs✓
2. Balways live inside cocoons✓
3. Care aquatic while adults are terrestrial only✓
4. Dresemble adults and share the same habitat✓

The taxonomic rank below order and above genus is

1. Afamily✓
2. Bclass✓
3. Cphylum✓
4. Dspecies✓

A dichotomous key identifies insects by using

1. Arandom chemical sprays✓
2. Bpaired contrasting characters✓
3. Ccrop yield records only✓
4. Dsoil texture classes only✓

Agricultural entomology studies

1. Aonly fish taxonomy✓
2. Bonly soil texture triangles✓
3. Cinsects and their relation to crops and control✓
4. Donly tractor gearboxes✓

Insects are characterized by

1. Athree body regions, six legs and usually wings in adults✓
2. Beight legs like spiders✓
3. Cno segmented bodies✓
4. Donly two legs✓

Metamorphosis in insects may be

1. Acomplete (egg-larva-pupa-adult) or incomplete✓
2. Babsent in all pests✓
3. Conly a plant process✓
4. Didentical to seed germination✓

Chewing mouthparts are typical of

1. Aaphids and whiteflies (piercing-sucking)✓
2. Bbollworms, grasshoppers and many beetles✓
3. Cmosquitoes only as larvae identical✓
4. Dbutterflies that only sip forever as larvae✓

Piercing-sucking insects include

1. Alocusts with chewing mandibles only✓
2. Bstem borers that only chew tunnels✓
3. Caphids, whiteflies, jassids and plant bugs✓
4. Dcutworms that cut seedlings✓

Cotton bollworm (Helicoverpa) damages

1. Asquares, flowers and bolls✓
2. Bonly wheat roots exclusively✓
3. Conly citrus leaves as rust✓
4. Donly fish ponds✓

Whitefly is notorious in Pakistan cotton for

1. Acausing only stem rust pustules✓
2. Breplacing grains with smut✓
3. Csucking sap and transmitting cotton leaf curl virus✓
4. Dcutting seedlings like cutworm✓

American bollworm is another name often used for

1. APectinophora gossypiella only✓
2. BHelicoverpa armigera✓
3. CSitophilus oryzae only✓
4. DApis mellifera✓

Aphids damage crops mainly by

1. Aboring into wood like termites only✓
2. Bcutting stems at soil line only✓
3. Cmining only citrus rind exclusively✓
4. Dsucking sap and transmitting viruses; honeydew/sooty mold✓

Jassids (leafhoppers) on cotton cause

1. Aonly smut of wheat✓
2. Bonly root knots✓
3. Cleaf curling/yellowing from sap sucking✓
4. Donly fruit fly stings on mango exclusively✓

Thrips injure plants by

1. Achewing entire bolls like bollworm larvae always✓
2. Bmaking rust pustules✓
3. Cproducing bacterial ooze✓
4. Drasping and sucking tender tissues✓

Stem borers are especially important in

1. Aonly stored grain weevils indoors✓
2. Brice and sugarcane (and some other cereals)✓
3. Conly honey bees✓
4. Donly earthworms✓

Rice stem borer damage symptoms include

1. Aonly citrus canker lesions✓
2. Bdead hearts and white ears✓
3. Conly powdery mildew mats✓
4. Donly root galls✓

Shoot fly is a notable pest of

1. Amature mango trunks only✓
2. Bsorghum/maize seedlings (dead hearts)✓
3. Cstored wheat only✓
4. Dadult cattle only✓

Army worms and cutworms typically

1. Asuck phloem like whitefly only✓
2. Bvector CLCuD primarily✓
3. Cform smut balls✓
4. Dcut or defoliate seedlings and plants, often at night✓

Fruit flies infest

1. Aonly cotton roots✓
2. Bonly wheat ears as rust✓
3. Conly potato tubers as blight✓
4. Dripening fruits such as mango and guava✓

Red palm weevil is a destructive pest of

1. Awheat only✓
2. Bpotato only✓
3. Cdate palm and related palms✓
4. Dcotton squares only✓

Termites in agriculture damage

1. Awooden structures, roots and sometimes crops/seedlings✓
2. Bonly adult flying whiteflies✓
3. Conly rust spores✓
4. Donly drip filters exclusively✓

Stored grain pests include

1. Aonly field bollworms on green bolls✓
2. Bonly fruit flies on trees✓
3. Cweevils, beetles and moths attacking grain in storage✓
4. Donly stem borers in standing rice✓

Locusts are dangerous because they

1. Aswarm and devour vegetation over large areas✓
2. Bfix only microscopic leaf spots✓
3. Ctransmit only soil nematodes✓
4. Dfix nitrogen for legumes✓

Beneficial insects include

1. Apredators, parasitoids and pollinators✓
2. Bonly bollworms✓
3. Conly whiteflies✓
4. Donly stem borers✓

Ladybird beetles are valued as

1. Apredators of aphids and soft-bodied pests✓
2. Bprimary cotton bollworms✓
3. Cfruit fly maggots✓
4. Dstored grain weevils✓

Trichogramma wasps are used as

1. Achewing defoliators✓
2. Bsap-sucking vectors of CLCuD✓
3. Cstored grain primary pests✓
4. Degg parasitoids in biological control✓

Honey bee (Apis) is important for

1. Apollination and honey production✓
2. Bcausing cotton leaf curl✓
3. Cboring rice stems✓
4. Dcutting potato seed pieces as cutworm✓

Insecticides are chemicals that

1. Acure only fungal rusts✓
2. Bkill or repel insect pests✓
3. Cadd nitrogen to soil✓
4. Draise soil organic matter directly✓

Systemic insecticides are taken up by

1. Aonly the soil surface film forever without uptake✓
2. Bplant tissues and can affect feeding insects✓
3. Conly tractor tires✓
4. Donly canal water without plants✓

Contact insecticides act when

1. Ainsects touch treated surfaces or spray droplets✓
2. Bonly after fungi form pustules✓
3. Conly via viral replication✓
4. Donly through nematode stylet in roots exclusively✓

Stomach poisons affect insects that

1. Aingest treated plant material✓
2. Bnever feed✓
3. Conly walk on untreated glass✓
4. Donly breathe pure nitrogen✓

Insect growth regulators (IGRs) disrupt

1. Aphotosynthesis in wheat✓
2. Bnitrogen fixation in Rhizobium✓
3. Csoil texture classes✓
4. Dmolting/development rather than quick knockdown alone✓

Pesticide resistance develops when

1. Apests are never exposed to chemicals✓
2. Brepeated selection favors tolerant pest populations✓
3. Conly resistant crop varieties are banned✓
4. Drefugia are perfectly managed always✓

Economic Injury Level (EIL) is the pest density at which

1. Apests first appear anywhere✓
2. Bzero insects remain✓
3. Cdamage equals cost of control✓
4. Dfungicides must be sprayed weekly always✓

Economic Threshold (ETL) is typically

1. Athe pest level at which control should be applied to prevent reaching EIL✓
2. Bthe same as zero insects✓
3. Calways 100% infestation✓
4. Dirrelevant to IPM✓

Scouting/monitoring in entomology means

1. Anever visiting fields✓
2. Bregular field inspection of pest and beneficial populations✓
3. Cspraying on fixed dates only✓
4. Dignoring insect counts✓

Pheromone traps are used to

1. Airrigate orchards✓
2. Bmonitor or mass-trap certain moth pests✓
3. Capply nitrogen✓
4. Dmeasure soil EC✓

Light traps attract

1. Aonly soil nematodes✓
2. Bonly fungal spores✓
3. Cmany night-flying insects for monitoring✓
4. Donly fish fingerlings✓

Cultural control examples include

1. Aonly calendar insecticide sprays✓
2. Bonly ignoring residues✓
3. Ccrop rotation, sowing date adjustment and destruction of alternate hosts✓
4. Donly banning all predators✓

Mechanical control includes

1. Aonly systemic seed treatments✓
2. Bonly aerial ULV always✓
3. Conly ignoring ETL✓
4. Dhand picking, barriers, traps and destruction of infested parts✓

Biological control uses

1. Aonly broad-spectrum sprays daily✓
2. Bonly soil solarization for insects exclusively✓
3. Conly resistant varieties with zero enemies✓
4. Dnatural enemies to suppress pests✓

Selective insecticides are preferred in IPM because they

1. Akill all insects including bees always✓
2. Bhave no label instructions✓
3. Cincrease resistance fastest always✓
4. Dspare many beneficials compared with broad-spectrum products✓

Neem-based products are examples of

1. Abotanical insecticides used in eco-friendly programs✓
2. Bsynthetic pyrethroids only✓
3. Corganophosphate nerve gases only✓
4. Dfungal rust spores✓

Quarantine pests are those that

1. Aare always beneficial pollinators✓
2. Bnever travel with produce✓
3. Care ignored by SPS rules✓
4. Dare regulated to prevent entry/spread across regions✓

Integrated control of cotton sucking pests emphasizes

1. Adaily sprays regardless of counts✓
2. Bdestroying all beneficials first✓
3. Cmonitoring, thresholds and conservation of natural enemies✓
4. Dplanting only without scouting✓

Fall armyworm has become important on

1. Aonly date palm trunks✓
2. Bmaize and other cereals/grasses✓
3. Conly stored mung in godowns exclusively✓
4. Donly citrus canker lesions✓

Mealybugs damage plants by

1. Achewing bolls like Helicoverpa only✓
2. Bmining leaf mesophyll only as leaf miners always✓
3. Csucking sap and secreting honeydew✓
4. Dcutting stems at ground level✓

Scale insects are typically

1. Ahighly mobile locust swarms✓
2. Bsedentary sap feeders on stems/leaves✓
3. Csoil-only white grubs always✓
4. Dfree-living honey bees✓

Leaf miners create

1. Aserpentine or blotch mines inside leaves✓
2. Bsmut balls in florets✓
3. Crust uredinia on wheat✓
4. Dgalls only on roots always✓

Safe insecticide use requires

1. Amixing by guesswork✓
2. Bcorrect dose, PPE, PHI and label compliance✓
3. Cspraying upwind into face without PPE✓
4. Dignoring pre-harvest intervals✓

Mode of action rotation helps to

1. Aspeed resistance selection✓
2. Beliminate all monitoring needs✓
3. Creplace ETL concepts✓
4. Ddelay insecticide resistance✓

The immature damaging stage of most Lepidopteran pests is the

1. Aonly the egg that never feeds✓
2. Bonly the pupa that feeds heavily✓
3. Cadult butterfly that chews bolls like larvae✓
4. Dlarva (caterpillar)✓