Pollen grains are well preserved as fossil for many years due to some characteristics
Give reasons

Identify the pair of wrong statements. I. Intine of pollen grains is made up of sporopollenin II. Pollen grains are well preserved as fossils because of the presence of sporopollenin III. Enzymes can degrade the organic material of the pollen grain exine IV. Sporopollenin can withstand high temperature, strong acids and alkali

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

The magnifying power of a telescope depends on the focal length of the objective and that of the eye- piece. Data of some lenses are given in the table. Choose any two lenses which are to be preferred as objective and eye-piece to construct a telescope. Give reason for your selection.

The birds are well adapted for flying. a) Write the general characters of Aves. b) Give some of the flight adaptations seen in birds.

Ecological pyramids are usually upright. Meanwhile some pyramids of biomass are inverted. Give reason.