Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Explain brood parasitism with the help of an example.

Name the sperm lysin, which organelle secretes it? What is its function?

Why does the platelet count decrease in dengue patient?

The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?

Nikhil goes with his family for dinner and insists on sitting in the non-smoking area to which his father (who is a heavy smoker) obiects.

On his visit to a national park, Harshendra was very angry as the forest authorities did not allow him to enter a specified area. On returning back, he discussed the matter with his friend, who explained him the reason.

1. Which category of conservation strategy does national park belong?
2. Name India's first national park.
3. At present, there are how many national parks in India?
4. What values are shown by Harshendra's friend?

a. Identify stages A and B in the given diagram.
b. Larvae are also called …………..
c. The diagram represent life cycle of ……………

Unambiguous, universal and degenerate are some of the terms used for the genetic code. Explain the salient features of each one of them.

Why do animals need to maintain homeostasis?

What is adaptive radiation? When can adaptive radiation be referred to as convergent evolution? Give an example.