Answer the following
(i) What is the function of nephridia?
(ii) How many types of nephridia are found in earthworm based on their location ?

How many types of nerves are there ? What are they ?

How many types of plastids are there? What are they?

How many types of respiration are present ? What are they ?

What is nutrition ? How many types of nutrition are there ?

How many types of adsorption are known ? What are they ?

Observe the diagram and answer the following. What is the function of Acrosome?

Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?

What is environmental pollution? How many types of pollution are encountered?