Question Bank [2022] — BIOLOGY STD 12 Science — Question

Label the given male reproductive system you have studied.

A team of students are preparing to participate in the interschool sports meet. During a practice session, you find some vials with labels of certain cannabinoids.

1. Will you report to the authorities? Why?
2. Name a plant from which such chemicals are obtained.
3. Write the effect of these chemicals on human body.

A farmer harvests his crop and expresses his harvest in three different ways.

1. I have harvested 10 quintals of wheat.
2. I have harvested 10 quintals of wheat today in one acre of land.
3. I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing.

Do the above statements mean one and the same thing. If your answer is yes, give reasons. And if your answer is ‘no’ explain the meaning of each expression.

Name the pioneer species on a bare rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately get established.

Why law of segregation is also called the law of purity of gametes?

List the disadvantages of insulin obtained from the pancreas of slaughtered cows and pigs:

Give scientific : A drunken person cannot maintain balance of the body.

Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.

The generative cell of a 2-celled pollen divides in the pollen tube but not in a 3-celled pollen. Give reasons.

Show with the help of a flow chart only, the life cycle of malerial parasite in humans.