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

Anal cerci occur in

  1. both male and female cockroaches

  2. male cockroaches only

  3. female cockroaches only

  4. female ascaris
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cerci are the two little hairs on the rear end of a cockroach. They act like a motion detector. When something tries to sneak up on a cockroach, the cerci detect the slightest breeze or movement, and alert the cockroach to run in the opposite direction.

Multiple choice

Sycon is a _______ sponge.

  1. marine

  2. freshwater

  3. land

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

Sycon is a marine sponge. Sponges are marine invertebrates with a jelly-like mesohyl sandwiched between two layers of cells. 

Multiple choice

Which stage is absent in incomplete metamorphosis of insects?

  1. Egg

  2. Larva

  3. Pupa

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

  Pupa is the stage in the life cycle of insects which undergo complete metamorphosis and is replaced by a form which is similar in many ways to adult form in case of incomplete metamorphosis and is called nymph.

Multiple choice

What is the biological name of cockroach?

  1. Rana tigrina

  2. Periplaneta americana

  3. Pheritima posthuma

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

Periplaneta americana is the scientific name for the common American cockroach. Other options refer to a frog (Rana tigrina), an earthworm (Pheretima posthuma), and a rose (Rosa indica).

Multiple choice

Arthropod skeleton is made up of

  1. chitin

  2. cellulose

  3. calcium carbonate

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

The exoskeleton of arthropods is composed primarily of chitin, a long-chain polymer of N-acetylglucosamine, which provides structural support and protection.

Multiple choice

Excretion in Taenia is through

  1. malpighian body

  2. flame cell

  3. green gland

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

Flatworms like Taenia use specialized cells called flame cells (protonephridia) for osmoregulation and excretion. Malpighian bodies and green glands are found in arthropods.

Multiple choice

Cysticercus is the

  1. larval stage of Taenia

  2. infective stage of monocystis

  3. part of internal ear of frog

  4. abdomen appendage of cockroach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cysticercus is the larval stage of the tapeworm Taenia solium, which develops in the intermediate host (pig).

Multiple choice

The role of porocyte cells is

  1. excretion in flat worms

  2. to form excurrent opening for water current in sponge

  3. to secrete sweat in mammals

  4. to form incurrent opening for water current in sponge.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Porocytes are specialized tubular cells in sponges that form the ostia, which are the incurrent pores allowing water to enter the body cavity.