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

Glands whose secretions are responsible for formation of ootheca in female cockroach are?

  1. Collateral glands

  2. Seminal vesicles

  3. Phallic gland

  4. Conglobate glands
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The secretions of the collateral glands in the female cockroach harden to form the protective egg case, known as the ootheca.

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

Read the following statements carefully, which is incorrect about cockroach?

  1. In cockroach one pair testis present from $4$ to $6^{th}$ abdominal segments
  2. Mushroom shaped gland is present in the $6^{th}$ - $7^{th}$ abdominal segments

  3. Sperms are stored in the seminal vesicles

  4. The external ganitalia are represented by phallic gland
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The statement claiming that external genitalia are represented by the phallic gland is incorrect; the phallic gland is part of the male accessory reproductive glands, while external genitalia are represented by male gonapophysis or phallomere.

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

Select the incorrect statement among the following.

  1. Paurometabolous development occurs in Periplaneta and it involves $13$ moults for nymph to grow into an adult

  2. Sperms in males are stored in seminal vesicles while they are stored in spermatheca in a female cockroach

  3. Mosaic vision in cockroach is characterised by high resolution but less sensitivity

  4. Nitrogenous waste in haemolymph of cockroach are found in form of potassium urate
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

In Cockroach an ovary is formed of ovarioles

  1. 4

  2. 6

  3. 8

  4. 10
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Each ovary is formed of a group of eight ovarian tubules or ovarioles containing a chain of developing ova. An ovariole is made up of an epithelial layer resting on a basement membrane and enclosed externally in a connective tissue coat. Hence In cockroach, an ovary is formed of 8 ovarioles.

So the correct answer is "8".

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

Cockroach has a stomadaeal valve between 

  1. Crop and gizzard

  2. Gizzard and mesenteron

  3. Mesenteron and ileum

  4. Ileum and colon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The gizzard is an outer layer of thick circular muscles and has a thick cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles. The entire foregut is lined by the cuticle. Gastric caecae are present in the foregut and midgut., which secrete digestive juice. A stomadaeal valve is present in between the gizzard and the midgut (mesenteron).

So the correct answer is "Gizzard and mesenteron".

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

Periplanata shows

  1. Complete metamorphosis

  2. Incomplete metamorphosis

  3. No metamorphosis

  4. Gradual metamorphosis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cockroach follow a hemimetabolous mode of metamorphosis. It is also known as gradual metamorphosis. The hemimetabolous life cycle consists of egg, nymph and adult.

So, the correct answer is 'Gradual metamorphosis'

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

Number of fertilized eggs in ootheca of Cockroach is

  1. 16 pairs in two rows

  2. 16 in two rows

  3. 10 in one row

  4. 8 in two rows
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

In Cockroach, ootheca is produced by secretion of 

  1. Conglobate gland

  2. Phallic gland

  3. Colleterial gland

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

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

In Cockroach, conglobate gland occurs in

  1. Females

  2. Males

  3. Nymph

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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'.