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

How do most insects respire?

  1. Through skin

  2. Through gills

  3. By lungs

  4. By tracheal system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Insects respire through a network of tiny tubes called tracheae, which open to the outside through small holes known as spiracles.

Multiple choice

Silk is produced by :

  1. cuticle of larva

  2. salivary glands of larva

  3. cocoon

  4. salivary glands of adult
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Each cocoon of silk worm (Bombyx mori) has about 1000 meter of silk thread. During its short life the female moth lays about three to five hundred whitish eggs. A minute caterpillar larva hatches out from each egg in about 10 days. The larva starts pouring out its sticky saliva through a minute aperture called spinneret located upon the lower lip of its mouth. As it comes out in air the lpuid saliva immediately solidify into a fine silk thread. 

Multiple choice

Which of the following is enteronephric nephridia in earthworm?

  1. Pharyngeal and septal

  2. Septal and integumentary

  3. Integumentary and pharyngeal

  4. Integumentary only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The septal nephridia and pharngeal nephridia dishcarge thier waste products into the lumen of the alimentary canal and not outside. These are knwon as enteronephric types of nephridia. In Pheretima three types of nephridia are present

  1.        Septal nephridia
  2.        Pharyangeal nephridia
  3.        Integumentary nephridia. 
Multiple choice

Which of the following structures in Pheretima posthuma play the role of the liver of vertebrates?

  1. Calciferous glands

  2. Gland cells

  3. Chloragogen cells

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

Chloragogen cells of Pheretima posthuma is considered to be analogous to liver of vertebrates. Chloragogen cells are said to be excretory but their exact nature is not definitely known. Some zoologist are of the opinion that the chloragogen cells store the reserve food material and also manufacture glycogen form fatty acids. 

Multiple choice

Excretory system of the tapeworms is known as

  1. spark cells

  2. flame cells

  3. fire cells

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Flame cells are the specialized excretory cells found in the simplest freshwater invertebrates, including flatworms like tapeworms, to remove waste materials.

Multiple choice

In cockroaches, air enters the body through

  1. Lungs

  2. Gills

  3. Spiracles

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

Spiracles - A cockroach has small openings on the sides of its body. Other insects also have similar openings. These openings are called spiracles