Differentiate between Turner’s syndrome and Down’s syndrome.

Name the pollutant attributed to be the cause of ‘ozone-hole’ over the Antarctica region.

OR

List the greenhouse gases other than carbon dioxide.

(a) List any two characteristic features of wheat flowers that make it a good example of wind pollination.

(b) It is observed that plant breeders carrying out wheat hybridization often take pollen grains from the ‘pollen banks’. Do you agree? Give one reason in support of your answer.

Explain the relationship between B-lymphocytes and T-lymphocytes in developing an immune response.

Why has the Indian Government set up the organization named GEAC?Give any two reasons.

OR

Give a schematic representation of the transformation of a pro-insulininto insulin.