Tag: zoology

Questions Related to zoology

Number of fertilized eggs in ootheca of Cockroach is

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. 16 pairs in two rows

  2. 16 in two rows

  3. 10 in one row

  4. 8 in two rows

Show answer
Correct Option: B
Explanation:

In cockroach, the fertilized eggs are encased in a casing called the oothecae. Ootheca of cockroach contains 16 fertilized eggs in two rows (8 + 8). 

So, the correct answer is '16 in two rows'.

In Cockroach, ootheca is produced by secretion of 

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Conglobate gland

  2. Phallic gland

  3. Colleterial gland

  4. Mushroom gland

Show answer
Correct Option: C
Explanation:

In Cockroach, there are a pair of collaterial glands. A pair of branched collaterial glands open into genital chamber. The secretion of collaterial glands secrete oothecal case.

So, the correct answer is 'Colleterial gland'.

In Cockroach, conglobate gland occurs in

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Females

  2. Males

  3. Nymph

  4. Both A and B

Show answer
Correct Option: B
Explanation:

The phallic or conglobate gland is an elongated and flattened gland that lies below ejaculatory duct in males. The posterior end is narrow and opens separately by the side of the male genital pore.

So, the correct answer is 'Males'.

Fertilized eggs of Periplaneta americana are encased in

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Ootheca

  2. Cocoon

  3. Phallomere

  4. Genital chamber

Show answer
Correct Option: A
Explanation:

The female reproductive system has two large ovaries that are present laterally in the 2nd to the 6th abdominal segments. A group of eight ovarian tubules forms one ovary. They contain a chain of developing ova. The fertilized eggs are encased in a casing called the oothecae. Female cockroaches produce around 9 to 10 oothecae which contain around 14 to 16 eggs each.

So the correct answer is 'Ootheca'.

About how many times does the nymph of Periplaneta americana undergo moulting before becoming an adult

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. 2

  2. 3

  3. 4

  4. 13

  5. 17

Show answer
Correct Option: D
Explanation:

The nymphal stage begins when the egg hatches and ends with the emergence of the adult. The number of times a Periplaneta americana moults 13 times. The first instar American cockroach is white immediately after hatching then becomes a greyish brown.

So the correct answer is '13'.

Select the correct option about cockroach :

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Males bear short oval styles not present in females

  2. Nervous system comprises a dorsal nerve cord and ten pairs of ganglia

  3. Fore wings are tegmina which are used in flight

  4. Malpighian tubules convert nitrogenous wastes into urea

Show answer
Correct Option: A

In Periplaneta, ductus ejaculatorius of male reproductive system lies in

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. 7th segment

  2. 8th segment

  3. 5th segment

  4. 6th segment

Show answer
Correct Option: A
Explanation:

A mushroom-shaped gland is present in the 6th and 7th abdominal segments of a male cockroach. It acts as an accessory reproductive gland. The mushroom gland has two types of tubules. These tubules open into the ejaculatory duct or ductus ejaculatorius in the 7th segment.

So, the correct answer is the '7th segment'.

In male cockroach, sperms are stored in part of reproductive system

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Vas deferens

  2. Seminal vesicles

  3. Mushroom glands

  4. Testes

Show answer
Correct Option: B
Explanation:

A mushroom gland is a large and whitish accessory gland located at the junction of vasa deferential and ejaculatory duct. It is formed of three types of small sac-like tubules 

(a) long tubules or utriculi majors forming the peripheral plant of a gland
(b) Small tubule or utriculi breviores forming the anteromedian part of the gland 
(c) small, bulblike, seminal vesicles forming the posteromedial part of the gland. The sperms remain stored in seminal vesicles. 
So, the correct answer is 'Seminal vesicles'.

Statement a. Secretion of colleterial gland forms the egg case in Cockroach
Statement b. The development of Cockroach is hemimetabolous.

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Both the statements, a and b, are correct and b is the reason for a

  2. Both the statements, a and b, are correct but b is not the reason for a

  3. Statement a is correct but statement b is wrong

  4. Statement b is correct but statement a is wrong

Show answer
Correct Option: C
Explanation:

The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca.

Hemimetabolous or incomplete metamorphosis: The insects which attain adult forms by gradual morphological change with succes­sive moults are called incomplete metamor­phosis or hemimetabolous development. This type of metamorphosis is seen in insects like butterflies, moths, beetles, ants, etc.
So, the first statement that the secretion of colleterial gland forms the egg case in Cockroach is correct while the second statement saying The development of Cockroach is hemimetabolous is incorrect and the first and the second statements are not related to each other.
Hence, the correct option is 'C'.

In Periplaneta, which one helps in nourishing the sperms

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Ejaculatory duct

  2. Vas deferens

  3. Utriculi majores

  4. Utriculi breviores

Show answer
Correct Option: D
Explanation:

A mushroom-shaped gland is present in 6th and 7th abdominal segments of a male cockroach. It acts as an accessory reproductive gland. The mushroom gland has two types of tubules:

a) Utriculimajores/peripheral tubules: Form the inner layer of spermatophore
b) Utriculibreviores: Nourishes the sperms. 
So, the correct answer is 'Utriculi breviores'.