Which part of the brain controls the involuntary action of the heartbeat?

Mention any four reflex actions of the body.

Plant roots grow towards water. What type of tropism is this?

What are the major parts of the brain? Mention the functions of different parts.

Name the system which facilitates communication between the central nervous system and the other parts of the body. Mention two types of nerves it consists of along with their organ of origin.

What is the gap between two neurons called?