Nervous System in Other Animals

Q.

In which animal, nerve cell is present but brain is absent?

1. Hydra

2. Cockroach

3. Sponge

4. Earthworm

Q.

_____________ are made up of a collection of cells that function independently without any coordination with each other.

1. Cnidarians

2. Annelids

3. Sponges

4. Protozoans

Q. Question 12
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?