NEET Biology Cockroach MCQs Set 01

Answer: (b) Periplaneta americana

Explanation:
1. Periplaneta americana is the common American cockroach.
2. Glossina is the tsetse fly, Musca is the housefly and Apis is the honey bee.

Teacher's Note:
1. Learn the binomials of common insects.
2. The generic name Periplaneta is always capitalised.

Answer: (c) Three pairs of legs

Explanation:
1. Insects have three pairs of jointed legs, which is why they are called Hexapoda.
2. Segmentation and chitin are shared by all arthropods.

Teacher's Note:
1. Hexapoda means six legs.
2. Use features that are unique to the class, not to the whole phylum.

Answer: (d) Periplaneta americana and Blatta orientalis

Explanation:
1. The two species commonly found in houses are Periplaneta americana and Blatta orientalis.
2. The other options mix up genus and species names.

Teacher's Note:
1. The genus name stays with its species: Periplaneta americana, Blatta orientalis.
2. Blatta is called the oriental cockroach.

Answer: (b) Three pairs of jointed legs

Explanation:
1. Insects have three pairs of jointed legs on the thorax.
2. Jointed appendages, chitinous exoskeleton and compound eyes occur in other arthropods as well.

Teacher's Note:
1. Three pairs of legs on the thorax is the class-level character.
2. Insects also have three body regions.

Answer: (c) Burmeister

Explanation:
1. The genus Periplaneta was named by Burmeister.
2. Linnaeus is the father of binomial nomenclature and Bahl is known for the earthworm Pheretima.

Teacher's Note:
1. Authority names come after the scientific name.
2. K.N. Bahl worked on Indian earthworms.

Answer: (a) Pleuron

Explanation:
1. Each abdominal segment has a dorsal tergum, a ventral sternum and lateral pleura.
2. The tergum and sternum are joined by the soft pleural membrane.

Teacher's Note:
1. Think of each segment as a ring with a top, bottom and sides.
2. The arthrodial membrane joins the plates.

Answer: (b) Frons

Explanation:
1. The frons lies on the front of the head between the compound eyes.
2. The vertex is the top of the head and the gena is the cheek.

Teacher's Note:
1. Frons means forehead.
2. Epicranium is the top of the head.

Answer: (c) Tergum

Explanation:
1. Dorsal sclerites are called terga, ventral sclerites are sterna and lateral ones are pleura.
2. The vertex belongs to the head.

Teacher's Note:
1. Tergum = back, sternum = belly.
2. Cockroach has 10 terga.

Answer: (c) Pleura

Explanation:
1. The lateral edge of the tergum bends down and connects with the pleura.
2. Muscles and fat body are not skeletal attachments.

Teacher's Note:
1. The pleura are the lateral sclerites.
2. Plates are joined by thin arthrodial membranes.

Answer: (a) Short with grinding teeth

Explanation:
1. The mandibles are hard, short and toothed structures that cut and grind food.
2. Long pointed or coiled mouth parts occur in piercing or siphoning insects.

Teacher's Note:
1. Mandibles are the biting jaws.
2. Cockroach mouth parts are of the chewing type.

Answer: (c) Hypognathous

Explanation:
1. The mouth parts point downward and the head is hypognathous.
2. The others are internal structures of the head.

Teacher's Note:
1. Hypo means below and gnathos means jaw.
2. Prognathous heads point forward.

Answer: (b) 7

Explanation:
1. The female has seven visible sterna because the 8th and 9th are folded inside.
2. The male shows nine sterna.

Teacher's Note:
1. Female 7 sterna, male 9 sterna.
2. Both sexes have 10 terga.

Answer: (b) Hypopharynx

Explanation:
1. The hypopharynx acts as the tongue and receives the salivary duct.
2. The labrum is the upper lip and the labium is the lower lip.

Teacher's Note:
1. Hypopharynx lies in the preoral cavity.
2. It is a median structure.

Answer: (b) Labium

Explanation:
1. The labium is formed by the fusion of the second maxillae.
2. The labrum is the upper lip.

Teacher's Note:
1. Labrum is upper, labium is lower.
2. Labium has a mentum, submentum and palps.

Answer: (a) Well-developed wings

Explanation:
1. Both sexes of P. americana have well-developed wings that extend beyond the abdomen.
2. In Blatta orientalis the female has only rudimentary wings.

Teacher's Note:
1. Wings are a convenient way to distinguish the two.
2. Males of Blatta have shorter wings than P. americana.

Answer: (b) 5

Explanation:
1. Each leg has coxa, trochanter, femur, tibia and tarsus.
2. The tarsus is further divided into five tarsomeres.

Teacher's Note:
1. The five main parts are CTFTT.
2. Legs are attached to the thorax.

Answer: (d) Blatta

Explanation:
1. In Blatta orientalis the female has only vestigial wing pads.
2. Housefly and mosquito have functional wings.

Teacher's Note:
1. The wings of female Blatta are rudimentary.
2. P. americana has fully developed wings in both sexes.

Answer: (c) Locomotion

Explanation:
1. The arolium is a pad between the claws that helps the cockroach grip smooth surfaces.
2. It has nothing to do with digestion, respiration or reproduction.

Teacher's Note:
1. Arolium and plantulae help to walk on vertical surfaces.
2. It lies at the pretarsus.

Answer: (d) Anal styles

Explanation:
1. Anal styles are present only in males, on the 9th sternum.
2. Antennae, mandibles and anal cerci occur in both sexes.

Teacher's Note:
1. Males have both anal cerci and anal styles.
2. Females only have cerci.

Answer: (c) Male cockroach

Explanation:
1. A pair of anal styles lies on the 9th sternum of the male.
2. Females have no anal styles.

Teacher's Note:
1. Anal styles are a male character.
2. They are thread-like and unjointed.

Answer: (d) Anal cerci

Explanation:
1. The anal cerci carry many sensory hairs that detect sound and vibrations.
2. Antennae are mainly for touch and smell.

Teacher's Note:
1. Anal cerci are sensory.
2. Males and females both have a pair.

Answer: (c) Both sexes

Explanation:
1. Stink glands open between the 5th and 6th terga of both males and females.
2. They release a foul-smelling secretion.

Teacher's Note:
1. Stink glands are present in both sexes.
2. They help in defence.

Answer: (c) Chitin

Explanation:
1. The cuticle is built mainly of chitin, a polysaccharide.
2. Keratin is in vertebrate skin and spongin in sponges.

Teacher's Note:
1. Chitin is a nitrogen-containing polysaccharide.
2. It is secreted by the epidermis.

Answer: (a) Head region

Explanation:
1. A cuticular endoskeleton (the tentorium) is found in the head region.
2. Elsewhere only the exoskeleton is present.

Teacher's Note:
1. Insects mostly have an exoskeleton.
2. Tentorium supports the head and brain.