Viplav is a photographer. He finds that his vision gets blurred. This happens when he goes from taking pictures of faraway objects to reading text on his camera screen. He recalls learning about certain defects of the eyes during his school days.

(a) Name the defect of the eyes which Viplav is suffering from.

(b) Mention the type of lens that can be used to correct the above defect.

Draw a neat labelled diagram of a nucleotide.

Give two examples of radiation pollutants.

The need to limit the size of the family is more vital today than ever before. Give two reasons.