What is pigeon's milk? Give its function.

What are gemmules? Give their functions.

What is conductivity? Give its SI unit

What is resistivity?Give its unit.

What are choanocytes? Give thier function.

What is magnesia cement? Give 'its composition?

What is a zener diode? Give its symbol.

The touch receptors are either free dendritic endings or encapsulated dendritic endings present in the skin. a) What are the main functions of receptors of free dendritic endings ? b) Name the main receptors of encapsulated dendritic endings. Give its functions.