Biology

Invertebrate Zoology

634 Questions

Invertebrate zoology covers the anatomical and physiological characteristics of animals without backbones, focusing heavily on insects, earthworms, and other arthropods. These questions explore structural components like respiratory organs and excretory systems. This topic forms a crucial part of the biology section in various competitive exams.

Cockroach anatomyEarthworm organsInsect ordersRespiratory organsExcretory organs

Invertebrate Zoology Questions

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

Fertilized eggs of Periplaneta americana are encased in

  1. Ootheca

  2. Cocoon

  3. Phallomere

  4. Genital chamber
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. 2

  2. 3

  3. 4

  4. 13

  5. 17
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

Select the correct option about 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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anal styles are present only in male cockroaches and are used for sensory purposes, while females lack them.

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

In Periplaneta, ductus ejaculatorius of male reproductive system lies in

  1. 7th segment

  2. 8th segment

  3. 5th segment

  4. 6th segment
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Vas deferens

  2. Seminal vesicles

  3. Mushroom glands

  4. Testes
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

In Periplaneta, which one helps in nourishing the sperms

  1. Ejaculatory duct

  2. Vas deferens

  3. Utriculi majores

  4. Utriculi breviores
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Seminal vesicles

  2. Mushroom glands

  3. Testes

  4. Vas deferens
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach
Select the correct statement from the ones given below with respect to Periplaneta americana

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Male cockroach differs from female cockroach in having

  1. antennae

  2. labrum

  3. maxillae

  4. anal styles.
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

Match the following with reference to cockroach and choose the correct option.

(A) Phallomere (i) Chain of developing ova
(B) Gonopore (ii) Bundles of sperm
(C) Spermatophore (iii) Opening of the ejaculatory duct
(D) Ovarioles (iv) The external genitalia

  1. A- (iii), B- (iv), C- (ii), D- (i)

  2. A- (iv), B- (iii), C- (ii), D- (i)

  3. A- (iv), B- (ii), C- (iii), D- (i)

  4. A- (ii), B- (iv), C- (iii), D- (i)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(A) Phallomere - The external genitalia

(B) Gonopore - Opening of ejaculatory duct
(C) Spermatophore - Bundles of sperm
(D) Ovarioles - Chain of developing ova
So, the correct answer is (b).

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

Phallic organs in cockroach are related to

  1. Male excretory system

  2. Male reproductive system

  3. Female excretory system

  4. Female reproductive system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Phallic gland is a large club shaped gland present below ejaculatory duct. This gland secretes the outer layer of spermatophore.
So, the correct option is 'male reproductive system'
Multiple choice zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

In cockroach which is helpful in sexual attraction?

  1. Hormone ecdyson

  2. Pheromone

  3. Juvenile hormone

  4. Anal cerci
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sex pheromones are released by an organism to attract an individual for mating. Cockroaches form the dominance hierarchies based on pheromone badges, while females use the same pheromone for male choice.
Therefore, the correct answer is option B.

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

Egg of Cockroach is

  1. Mesolecithal

  2. Centrolecithal

  3. Telolecithal

  4. Alecithal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Eggs of cockroach are centrolecithal. During cytokinesis, centrolecithal zygotes undergo meroblastic cleavage, where the cleavage plane extends only to the accumulated yolk and is superficial. This is due to the large dense yolk found within centrolecithal eggs and helps in delayed embryonic development.

So the correct answer is "Centrolecithal".