Organisms and Populations — BIOLOGY STD 12 Science — Question

a. Give an example of viral biocontrol agent.
b. Why are they considered to be desirable when an ecologically sensitive area is being treated?

Do eukaryotic cells have restriction endonucleases? Justify your answer.

What is Bio piracy? State the initiative taken by the Indian Parliament towards it.

Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems.

Woman have more responsibility than man in the reproductive process. Why? Explain.

Who are called pollen robbers?

What will be the effect on sperms on removal of prostate and cowper’s glands from man’s body?

How is the first sign of growing foetus noticed?

Human blood group is a good example of multiple allelism and co–dominance. Justify.

In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated by a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny.
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White= 128
Mention the genotypes of the two parents and of the types of four off springs. in numbers mentioned against them.