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

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

Snails, beetles, worms, jellyfish, octopuses etc. are animals without backbone. They are called as ____.

  1. insects

  2. reptiles

  3. vertebrates

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

Invertebrates are animals that lack a vertebral column (backbone or spine). This group includes diverse animals like snails (mollusks), beetles (arthropods), worms (annelids), jellyfish (cnidarians), and octopuses (mollusks). Vertebrates, like humans, dogs, and birds, have a backbone. The term 'invertebrate' comes from 'in-' meaning 'without' and 'vertebra' meaning 'joint' or 'backbone'.

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

The undigested food in Hydra is expelled from

  1. cloaca

  2. anus

  3. mouth

  4. general body surface
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydra has a sac-like body plan with a single opening that serves as both mouth and anus. This opening, surrounded by tentacles, is used for both ingestion (taking in food) and egestion (expelling undigested material). Hydra lacks a true digestive tract with separate openings.