Question

Match the Stimulus with Appropriate Response.

Animals	Acoelomate	Pseudocoelomate	Coelomate
(i) Sea Anemone
(ii) Human
(iii) Sycon
(iv) Ascaris
(v) Earthworm

Answer 1

1. The three germinal layers form the coelom, a body cavity during embryonic development.
2. The body cavity refers to the space inside the body filled with fluid and contains organs.
3. The coelom is lined by cells from the mesodermal epithelium.
4. Animals are classified based on their type of coelom.

Acoelomate (i) Sea Anemone (iii) Sycon

1. An animal that does not have coelom is called acoelomate.
2. Examples: sponges and flatworms.

Pseudocoelomate (iv) Ascaris

1. An animal with false coelom derived from the blastocoel of the embryo is called Pseudocoelomate.
2. Example: roundworms.

Coelomate (v) Earthworm (ii) Human

1. The coelom is a fluid-filled body cavity in multicellular animals surrounded by mesodermal cells.
2. The animals that possess true coelom are called Coelomates.

Animals	Acoelomate A	Pseudocoelomate B	Coelomate C
(i) Sea Anemone	Acoelomate
(ii) Human			Coelomate
(iii) Sycon	Acoelomate
(iv) Ascaris		Pseudocoelomate
(v) Earthworm			Coelomate