In cockroach sclerites are joined by

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 "Arthrodial membrane".

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

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'.

Mouth parts of Cockroach are

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'.

Exoskeleton of cockroach is made up of

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.

Select the correct statement about Periplaneta americana.

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.

Which among these is not involved in excretion in cockroaches?

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'.

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

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'.

In Cockroach, the anterior wings are called

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'.

Anal style is present in_____________.

Anal style are a pair of thread like appendages arising from the 9th segment of the male cockroaches. They are characteristic feature of male arthropods and help in copulation. Anal styles are the un-jointed paired structures present in the 9th sternum of male cockroach.So, the correct answer is 'Male cockroach'.

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

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.

Morphology of Cockroach | Definition, Examples, Diagrams

definition

Morphology of cockroach

1. The cockroach, Periplaneta americana, is a common nocturnal omnivorous household pest, commonly found in damp and warm places.
2. The body is elongated, segmented, bilaterally symmetrical, flattened dorsoventrally and reddish-brown in colour.
3. It is covered by a hard brown-coloured jointed exoskeleton.
4. It is divisible into three parts, head, thorax and abdomen.
5. Head consists of 6 segments fused together.
6. At its upper side, it bears two large compound eyes.
7. A pair of antennae is present in the antero-medial indentation of the eyes.
8. The mouth is situated at the lower end of the head.
9. The mouth parts are of the chewing type, consisting of labrum, mandibles, maxillae, labium and hypopharynx.
10. The thorax consists of three segments, an anterior prothorax, a middle mesothorax and a posterior metathorax.
11. Each segment bears a pair of walking legs and mesothorax and metathorax also bear each pair of wings.
12. The abdomen is broad consisting of ten segments.