Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Write the name of hard resistant organic matter found in exine of pollen grain.

Define natality.

Name the historic convention on biological diversity held at Rio in 1992.

Why is secondary immune response more intense than the primary immune response in humans?

What is the fate of trophoblast in mammalian embryo?

Name the kind of cheese, which possesses characteristic holes.

Who developed the principle/ method of automated DNA sequences?

OR

Name the scientist who developed the method to determine the sequence of amino acids in proteins.

Mention the pollinating agent of an inflorescence of small dull-coloured flowers with well exposed stamens and large feathery stigmas. Give any one characteristic of pollen grains produced by such flowers.

Mention two advantages of seeds to man.

Define genetic drift.