Reproductive Health — BIOLOGY STD 12 Science — Question

Name the type of human cell HIV attacks on its entry into the body. Explain the events that occur in the cell which further lead to cause immunodeficiency syndrome.

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

Name the types of ecosystem.

Some parents wrote a complaint letter to the local municipality to remove all the hoardings in the city, advertising the use of condoms and matters relating to AIDS prevention. The children of these parents came to know about the matter and raised their voice against removal of the hoardings. The parents were convinced by the awareness level of their children and withdrew the complaint.

1. Parents considered the hoarding as inappropriate. Do you agree/ disagree with their view?
2. What are the methods by which AIDS spreads?
3. What is AIDS?
4. What values are promoted by the children protesting against their parents?

Monocistronic structural genes in eukaryotes have interrupted coding sequences. Explain. How are they different in prokaryotes?

1. Write the two limitations of traditional breeding technique that led to promotion of micro propagation.
2. Mention two advantages of micro propagation.
3. Give two examples where it is commercially adopted.

List three symptoms of high altitude sickness and state three adaptations to overcome it.

Removal of gonads cannot be considered as a contraceptive option. Why?

What is Tubectomy? Represent it diagrammatically.

What is advantage of cross-breeding in cattle?