Define Hormones

Mention the steps in the formation of urine in humans.

How does a stomata differ from a lenticel?

In the picture given below it is shown that the sewage water is running out of a pipe from someone's backyard into a stream? Study the figure and answer the questions that follows.

(a) Name the kind of pollution shown in the above picture.

(b) Name two sources of this pollution besides sewage.

(c) Name two infectious diseases that spread due to this kind of pollution.