Question

The nature of chaetae of Earthworm is
A. Chitin
B. Cellulose
C. Protein
D. Chitin and Scleroprotein

Answer 1

Hint: Earthworm is a terrestrial invertebrate.It is a hermaphrodite ( having both the sexes in one individual). Chaetae in Earthworm help in its locomotion.

Complete Answer:
Earthworm:
- Earthworms are classified in the phylum Annelida.
- Earthworm belongs to the class Oligochaeta.
- Earthworms exhibit a tube within a tube body plan.
- Their body is segmented.
- They occur worldwide where they get favourable conditions of soil, temperature and water.
- Earthworms are commonly found in soil and eat a variety of organic matter.
- Earthworms respire through its skin.
- They have a closed circulatory system.
- They lack a true skeleton and their body is supported with fluid-filled coelom.

Chaetae of Earthworm:
- Chaetae are present on every segment of the body of Earthworm except the first and last segment of the body.
- Chaetae are made up of Chitin and Scleroproteins.
- Chaetae are involved in the locomotion of the earthworm.
- The chaetae are epidermal extracellular structures.
Therefore, as we have seen in the above discussion that the nature of chaetae of Earthworm is Chitin and Scleroprotein.

Hence, option D is the right answer for this question.

Note: Chaetae are used in the taxonomy and identification. They bear precise characters for determination of species and taxonomic assessment.