Cockroach NCERT Quiz and Flashcards

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Questions and Answers

Size of cockroaches ranges from__to_ and have long antenna, legs and flat__________

0.6-7.6cm or 1/4th to 3 inches, flat extension of upper body wall that conceals head

Adults of Periplaneta americana are about ____mm long with wings that

34-53 mm long, extend beyond the tip of the abdomen in males

Triangular head lies anteriorly at right angles to longitudinal body axis. Formed by fusion of __ segments and shows_

6, great mobility in all directions due to flexible neck

Head capsule bears a pair of compound eyes. A pair of thread-like antennae arise from ________

membranous sockets lying in front of eyes Signup and view all the answers

end of the head bears ______type of mouth parts

anterior, biting and chewing Signup and view all the answers

What part acts as the tongue?

A median flexible lobe called hypopharynx lying within the cavity enclosed by mouthparts Signup and view all the answers

How is the head connected with the thorax?

Short extension of prothorax called neck Signup and view all the answers

Match the following segments with their definitions:

Forewings = Mesothoracic, opaque dark and leathery, cover hind wings when at rest Hindwings = Metathoracic, transparent, membranous and used in flight Signup and view all the answers

Brood or genital part in females formed by, anterior part contains

7th boat shaped sterna + 8th and 9th sterna, female gonopore, spermathecal pores and collateral glands Signup and view all the answers

In males genital chamber lies at hind end of abdomen bounded by- It contains- Males bear short thread-like anal styles.

9th sterna and 9th and 10th terga, dorsal anus, ventral genital pore and gonapophyses Signup and view all the answers

In both sexes, the 10th segment bears a pair of jointed filamentous structures called _________.

anal cerci Signup and view all the answers

Where is a pair of salivary glands present?

Near the crop Signup and view all the answers

Gizzard has outer layer of __ and thick inner _. Entire foregut lined by _____.

thick circular muscles, layer of cuticle forming six highly chitinous teeth, cuticle Signup and view all the answers

Ring of _______ blind tubules called Hepatic Caecae present at junction of midgut and foregut. Function-

6-8, secretion of digestive juice Signup and view all the answers

Ring of __________ thin yellow colored filamentous Malphigian tubules present at junction of midgut and hindgut. Function:

100-150, removal of excretory products from haemolymph Signup and view all the answers

Blood Vessels are- Haemolymph composed of-

Poorly developed and open into space (haemocoel), colorless plasma and haemocytes. Signup and view all the answers

Heart is differentiated into- Blood from sinuses enter heart through ostia and pumped ___ to sinuses again.

13 funnel shaped chambers with ostia on either side, anteriorly Signup and view all the answers

Respiratory system consists of_____. Tracheal tubes subdivided into Tracheoles, exchange of gases takes place at _.

Network of trachea that open through 10 pairs of small holes called spiracles (regulated by sphincters) on the lateral side of the body, tracheoles by diffusion Signup and view all the answers

Malphigian tubules lined by ___________ which absorb nitrogenous wastes to excrete through hindgut.

glandular and ciliated cells Signup and view all the answers

Nervous system in cockroach consists of_______________. How many ganglia in thorax and abdomen?

A series of segmentally arranged ganglia connected by paired longitudinal connectives on the ventral side, 3 and 6 Signup and view all the answers

Brain represented by , which supplies nerves to_.

supra oesophageal ganglion, antennae and compound eyes Signup and view all the answers

Compound eyes situated at _ surface of head with about _____ hexagonal ommatidia.

dorsal, 2000 hexagonal Signup and view all the answers

A pair of testis in _ segments. Characteristic mushroom gland in _ segments function as accessory reproductive gland.

4th-6th abdominal, 6th-7th abdominal Signup and view all the answers

Where are sperms stored?

Seminal vesicles and glued into spermatophores Signup and view all the answers

Two large ovaries in segments. Each ovary has ____.

2nd-6th abdominal, 8 ovarian tubules or ovarioles, containing a chain of developing ova. PAIR of spermatheca Signup and view all the answers

Ootheca are 3/8th inch or 8mm long. On average females produce

9-10 oothecae each with 14-16 eggs Signup and view all the answers

Paurometabolous development, with nymphs looking very much like adults. Nymph grows by moulting about __ times.

13, next to last stage has wing pads but only adult has wings Signup and view all the answers

Study Notes

Cockroach Anatomy and Physiology

Size ranges from 0.6 to 7.6 cm (1/4 to 3 inches); characterized by long antennae, legs, and a flat body.
Periplaneta americana adults measure 34-53 mm long, with males having wings extending beyond the abdomen tip.
Triangular head formed from six segments offers great mobility due to a flexible neck.
Head capsule features compound eyes and thread-like antennae originating from membranous sockets in front of the eyes.
Anterior end of the head has biting and chewing mouthparts; the hypopharynx acts as a tongue within the mouthparts.
The connection between the head and thorax is a short neck extension of the prothorax.

Wings and Reproductive Structures

Forewings (mesothoracic) are opaque and leathery, covering the hindwings at rest; hindwings (metathoracic) are transparent and used for flight.
Females have a brood or genital part formed by the 7th, 8th, and 9th sterna, containing gonopores and lateral glands.
In males, the genital chamber at the abdomen's hind end is bounded by the 9th sterna and terga; it includes an anus and genital pore.

Digestive and Excretory Systems

The alimentary canal contains a pair of salivary glands near the crop; the gizzard has circular muscle layers and chitinous teeth.
Hepatic ceca (6-8 blind tubules) secrete digestive juices at the junction of midgut and foregut.
Malpighian tubules (100-150) are present at the junction of midgut and hindgut, aiding in excretion of nitrogenous wastes.

Circulatory and Respiratory Systems

Blood vessels are poorly developed and open into haemocoel; haemolymph consists of colorless plasma and haemocytes.
The heart has 13 funnel-shaped chambers (ostia on either side) and pumps blood anteriorly.
The respiratory system is a network of trachea opening through 10 pairs of spiracles; gas exchange occurs in tracheoles through diffusion.

Nervous System and Sensory Organs

The nervous system comprises segmentally arranged ganglia, with 3 ganglia in the thorax and 6 in the abdomen; a supraoesophageal ganglion supplies nerves to antennae and compound eyes.
Compound eyes, located on the head's dorsal surface, consist of about 2000 hexagonal ommatidia, offering high sensitivity and low resolution.

Reproductive System

Male reproductive structures include two testes in the 4th-6th abdominal segments and a mushroom gland in the 6th-7th segments as an accessory reproductive gland.
Sperm is stored in seminal vesicles and forms spermatophores.
Females possess two large ovaries in the 2nd-6th abdominal segments with eight ovarioles, leading to a genital chamber with a pair of spermathecae.

Development

Cockroaches exhibit paurometabolous development; nymphs resemble adults and undergo approximately 13 moults, with wing pads appearing in the second-to-last nymph stage before developing into adults with wings.

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Test your knowledge about cockroaches with this engaging quiz based on Class 11 Biology NCERT curriculum. You will explore their anatomy, size, and distinguishing features. Perfect for students looking to reinforce their understanding of entomology!

Cockroach - Class 11 Biology NCERT Quiz

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