Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Why is it necessary to remove sulphur from petroleum products?

What do you mean by seasonal breeders?

Using _______ vectors, nematode-specific genes are introduced into host plants.

The egg of an animal contains 10 chromosomes, of which one is X-chromosome. How many autosomes would there be, in the karyotype of this animal?

What do you mean by foetal ejection reflex?

What is called the inability to conceive or produce children even after 2 year of unprotected sexual cohabitation?

Write a difference between net primary productivity and gross primary productivity.
OR
How is net primary productivity different from gross primary productivity?

Name the enzyme and state its property that is responsible for and discontinuous replication of the two strands of a DNA molecule.

Name the component cells of the ‘egg apparatus’ in an embryo sac.