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

Which of the following statements is not true regarding the muscular gizzard in earthworm?

  1. It helps in movement.

  2. It helps in grinding the soil particles.

  3. It helps in decaying the leaves.

  4. It helps in decaying the oragnic matter.

  5. It is present in 8th and 9th segments.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, this option is not true, hence the correct answer. Rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment. Setae can be extended or retracted and thus help in movement.

Multiple choice

Which of the following statements is/are correct about cockroaches?

a. They belong to the phylum Arthropoda. b. They are nocturnal. c. They have hard chitinous outer covering. d. Their body is divided into four distinct parts.

  1. a, b and c

  2. b and c

  3. d only

  4. a and d

  5. a and c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, this is the correct answer. Only statement d is incorrect. The body of a cockroach is segmented and divisible into three distinct regions – head, thorax and abdomen.

Multiple choice

Chenopodium oil is successfully used for the expulsion of

  1. tapeworm

  2. flatworm

  3. roundworm

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

Chenopodium oil (from Chenopodium ambrosioides) has been traditionally used as an anthelmintic, particularly effective against roundworms (nematodes) and hookworms. It is not typically used for tapeworms, flatworms, or liver flukes, which require different anthelmintic treatments.

Multiple choice

In cockroach, the excretory product is

  1. ammonia

  2. uric acid

  3. urea

  4. both 1 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cockroaches are uricotelic animals, meaning they excrete nitrogenous waste primarily as uric acid. This is an adaptation for water conservation since uric acid is relatively non-toxic and can be excreted as a semi-solid, requiring minimal water. Ammonia is highly toxic and needs dilution, while urea requires some water for excretion.

Multiple choice

Match the following:

 
a. Platyhelminthes 1. They have antennal glands to perform the excretory functions.
b. Annelids 2. They have protonephridia as the excretory structures.
c. Crustaceans 3. They have tubular excretory structures called nephridia.

  1. a - 1, b - 3, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 1, b - 2, c - 3

  4. a - 2, b - 1, c - 3

  5. a - 2, b - 3, c - 1
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. Platyhelminthes have protonephridia as the excretory structures. Annelids have tubular excretory structures called nephridia. Crustaceans have antennal glands to perform the excretory functions.

Multiple choice

Which of the following organisms is not an arthropod?

  1. Cockroach

  2. Spider

  3. House fly

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

Cockroaches, spiders, and house flies are all arthropods characterized by jointed appendages, segmented bodies, and exoskeleton. Snail is a mollusc with a soft body and shell (or no shell in slugs). Molluscs are a completely different phylum from arthropods.

Multiple choice

Which of the following organisms is called a 'friend of farmers'?

  1. Earthworm

  2. Leech

  3. Sycon

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

Earthworms are called 'friends of farmers' because they burrow through the soil, creating channels that allow air and water to reach plant roots. Their digestive process breaks down organic matter, converting it into nutrient-rich castings (vermicast) that enhance soil fertility and structure. Leeches are parasitic, Sycon is a marine sponge, and Ascaris is an intestinal parasitic roundworm - none provide agricultural benefits.

Multiple choice

Which of the following organisms is harmful to human beings?

  1. Centipede

  2. Millipede

  3. Prawn

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

Centipedes are venomous arthropods that can inflict painful bites on humans. Their modified front legs (forcipules) inject venom that can cause localized pain, swelling, and in some cases, systemic reactions. While millipedes are generally harmless (some produce irritating fluids), prawns are food sources, and cockroaches are disease vectors but not directly harmful through venom, centipedes pose the most direct physical threat through their venomous bite.

Multiple choice

What is the name of woven home of the silk worm?

  1. Cocoon

  2. Larva

  3. Pupa

  4. Moth

  5. Eggs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A caterpillar spins a cocoon made of either silk or some other similar fibrous material that is then spun around the the insect during their pupal stage. Pupal stage is the life stage of a silk worm insect.