Question 1

In cockroach sclerites are joined by

Accepted Answer

The entire body of the cockroach, is covered by a hard chitinous exoskeleton. In each segment, exoskeleton has hardened plates called sclerites that are joined to each other by a thin and flexible articular membrane known as the arthrodial membrane.So the correct answer is &#34;Arthrodial membrane&#34;.

Question 2

Mouth parts of Cockroach are

Accepted Answer

The mouth parts of cockroach are biting and chewing type. These are used in searching and ingestion of food. The mouth parts include labrum, mandibles, first pair of maxillae, labium or second pair of maxillae and hypopharynx.So, the correct answer is 'Biting and chewing'.

Question 3

Select the correct statement from the ones given below with respect to Periplaneta americana

Accepted Answer

Males bear a pair of short, thread-like anal styles which are absent in females, anal/caudal styles arise from the 9th abdominal segment in the male cockroach.So, the correct option is 'Males bear a pair of short thread-like anal styles'.

Question 4

Exoskeleton of cockroach is made up of

Accepted Answer

The exoskeleton of the head of the cockroach is known as epicranium. It consists of sex chitinous plates or sclerites. The addition of calcium carbonates to the chitin makes it tough. It helps in protection of the soft body. The shedding of the exoskeleton is known as moulting. Therefore, the correct answer is option C.

Question 5

Which among these is not involved in excretion in cockroaches?

Accepted Answer

Excretion in cockroach is primarly performed by Malpighian tubules. Each tubule is lined by glandular and ciliated cells. They absorb nitrogenous waste products and convert them into uric acid which is excreted out through the hindgut. In addition, the fat body,nephrocytes and urecose glands also help in excretion. While the maxillary palps are used for cleaning the antennae and also the front pair of legs.So, the correct option is 'Maxillary palps'.

Question 6

Select the correct statement about Periplaneta americana.

Accepted Answer

Periplaneta americana (American Cockroach) have a well developed nervous system. Their central nervous system consists of the brain and a ventral nerve cord. The nervous system contains fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.A pair of unsegmented, thread-like anal styles is attached to the 9$^{th}$ sternite of the male cockroaches. Malpighian tubules arise from the junction of midgut and hindgut.Grinding of food is done exclusively by the mandible.So, the correct answer is option B.

Question 7

In Cockroach, the anterior wings are called

Accepted Answer

The cockroach has three pairs of jointed appendages and two pairs of wings.The forewings are mesothoracic and are called wing covers or tegmina or elytra. These wings are anteriorly present. They cover the hindwings and are protective in function. These are dark stiff opaque and leathery.The hind wings are large, thin, membranous and transparent. They are kept folded below the tegmina and are used for flying.So the correct answer is 'Elytra'.

Question 8

What external changes are visible after the last moult of a cockroach nymph _________________.

Accepted Answer

In cockroach, development is pauro metabolous. The nymph grows by moulting about 13 times to reach the adult form. The next to last nymphal stage has wings. Anal cerci are a pair of jointed filamentous structures in the 10th segment of both sexes. The labium is a lower lip and a pair of mandibles are present in mouthparts of a cockroach.So, the correct answer is 'Both fore wings and hind wings develop'.

Question 9

Select the correct option:Which one of the following statements is true for cockroach?

Accepted Answer

Anal styles are paired, thin, unjointed outgrowths, projecting backwardly from the sides of 9th sternum of the male cockroach only. They are absent in females. The number of ovarioles in each ovary are eight. The larval stage of cockroach is called nymph. Cockroach is uricotelic.

Question 10

Tegmina are

Accepted Answer

The first pair of wings arises from mesothorax and the second pair from metathorax. Forewings are called as tegmina which are opaque dark and leathery. Tegmina cover the hind wings when at rest. The hind wings are transparent, membranous and are used in flight. So the correct answer is&#34;Both B and C&#34;.

Revise with Concepts

Morphology of Cockroach