Question

Name the part of nervous system which helps in communication between the central nervous system and other parts of the body. What are the two components of this system ?

Leaves of chhui-mui plant begin to fold up and droop in response to a stimulus. Name the stimulus and write the cause for such a rapid movement. Is there any growth involved in the movement ?

Define geotropism in plants. What is meant by positive and negative geotropism ? Give one example of each type.

Distinguish between hormonal co-ordination in plants and animals.

How is brain and spinal-cord protected against mechanical injuries ?