Biology

Invertebrate Zoology

799 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

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".

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

In Cockroach, ootheca is formed by secretion of

  1. Phallic gland

  2. Mushroom gland

  3. Colleterial gland

  4. All the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The colleterial glands open into the vestibulum and secrete most of the protein and tanning agent. The protein may not be directly concerned with ootheca formation, while the latter probably secretes the alkali-resistant outer layer of the ootheca.
The anterior and posterior parts of cockroach secreting the structural protein which produces most of the material used in the formation of the ootheca.

So the correct answer is "Colleterial gland".

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

Young Cockroach is called

  1. Maggot

  2. Nymph

  3. Ephyra

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

Cockroach eggs hatch because of the combined pressure of the hatchlings within. Upon emerging from the egg case, or ootheca, this immature form of cockroach is known as a nymph or baby cockroach. Nymphs are bright white in color initially. Cockroach nymphs are grayish-brown in color and darken with each progressive molt.  Cockroach nymphs undergo a series of molts. They emerge as full adults from their final molt.

So the correct answer is 'Nymph'.

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

Male cockroach is identified by the presence of

  1. Green gland

  2. Anal style

  3. Anal cercus

  4. Broad abdomen

  5. Colleterial gland
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The abdomen is made up of 10 segments. The 7th, 8th and 9th sterna form a genital pouch in females. In males, the genital pouch is present at the hind end of the abdomen. The male cockroach has thread-like anal styles, which are missing in the female cockroach. Hence, Male Cockroach is identified by the presence of anal style.

So the correct answer is 'Anal style'.

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

Choose the correct answer from the allternatives given.
In which of these organs sperms are nourished and stored in cockroach

  1. Testes

  2. Utricular gland

  3. Ejaculatory duct

  4. Conglobate gland
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In cockroaches, the sperm is stored in the seminal vesicles and are glued together in the form of bundles called spermatophores and discharged during copulation. Seminal vesicles are the part of the ejaculatory duct.

So, the correct option is 'Ejaculatory duct'.

Multiple choice zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach
In cockroach, the ootheca is formed by the secretion of 

  1. phallic gland

  2. collaterial gland

  3. mushroom gland

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

Collaterial glands are present in female cockroach as part of reproductive system. These glands are branched tubular glands opening independently on the dorsal side of the genital chamber. The secretion produced by these glands forms the oothecal case of ootheca.