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

Answer the following questions:
Mention the problems that are taken care of by Reproduction and Child Health Care programme.

Expand IUD.

Study the schematic representation of evolutionary history of plant forms given below and mention:

1. The plant form Ferns and Conifers are most related to.
2. The nearest ancestors of flowering plants.
3. The most primitive group of plants
4. Common ancestry Psilophyton provides to.
5. The common ancestors of Psilophyton and seed ferns.
6. The common ancestors of mosses and tracheophytes.

Name any two enzymes and antibiotics with their microbial source.

Given below is the representation of amino acid composition of the relevant translated portion of b-chain of haemoglobin, related to the shape of human red blood cells.

1. Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.
2. What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?
3. Who are likely to suffer more from the defect related to the gene represented – the males, the females or both males and females equally? Andwhy?

Write a note on the morphological structure of the root.

A factory drains its waste water into the nearby lake. It has caused algal bloom.

1. How was the algal bloom caused?
2. What would be the consequences?
3. Name the phenomenon that caused it.

Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.

1. State how the constant internal environment is beneficial to organisms.
2. Explain any two alternatives by which organisms can overcome stressful external conditions.

List any two types of IUDs that are available for human females and state their mode of action.