Tag: introduction to reproduction

Questions Related to introduction to reproduction

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'.

In male cockroaches, sperms are stored in which part of the reproductive system?

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

  1. Seminal vesicles

  2. Mushroom glands

  3. Testes

  4. Vas deferens

Show answer
Correct Option: A
Explanation:
  1. Testes lie dorsolaterally in the 4th and 5th abdominal segments, and they are the region of sperm production.
    2. Vas deferens are a pair of ducts arising from the testis as very thin whitish tubes, they continue posterioventrally beneath the rectum. They unite at a short distance into the ejaculatory duct.
    3. Mushroom gland is a large accessory reproductive gland, whitish in colour and situated at the junction of vasa deferentia with the ejaculatory duct. It has a mass of glandular tubules of two kinds; utriculi majores and utriculi breviores.
    4. The sperms produced from testes, while the cockroach is still young, are brought by the vasa deferentia into the seminal vesicles for storage. The sperms in the seminal vesicles are glued together in the form of bundles called spermatophores. 
    So, the correct option is 'Seminal vesicles'.
Select the correct statement from the ones given below with respect to Periplaneta americana
zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives

  2. Male bear a pair of short thread like anal styles

  3. There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

  4. Grinding of food is carried out only by the mouth parts

Show answer
Correct Option: B
Explanation:

In male cockroach, from the sides of the 9th sternum, there arises a paired, small unjointed outgrowths called anal styles. These structures are sensitive to touch.These are absent in female cockroach. Nervous system is located ventrally. There are 100-150 Malpighian tubules. Grinding of food is carried our by mouth parts and gizzard.

Male cockroach differs from female cockroach in having

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

  1. antennae

  2. labrum

  3. maxillae

  4. anal styles.

Show answer
Correct Option: D
Explanation:

1. The body of female cockroach is relatively larger than the male.

2. The abdomen of female cockroach is boat-shaped and the last segment is blunt.

3. The wings of female cockroach are smaller than that of the males and extend up to the tip of the abdomen.

4. The antennae are relatively larger than that of the males.

5. Only a pair of anal cerci is present in of female cockroach.

6. The sternum of mesothorax is bifid.

So the correct option is 'anal styles'.

The post embryonic stages in the life history of cockroach is known as

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

  1. Larval

  2. Grubs

  3. Caterpillar

  4. Nymphs

Show answer
Correct Option: D
Explanation:

All cockroaches develop by completing a life cycle consisting of three distinct stages: egg, nymph, and adult.

So, the correct option is  D. ( nymphs )