Human Reproduction — BIOLOGY STD 12 Science — Question

Solar energy trapped by green plants finally returns to the environment. Comment.

To which category of cells do B-cells and T-cells belong? How do they differ from each other with reference to their formation and response to antigens?

On world population day, Rohit and his friends arranged an awareness campaign on population explosion programme in their locality. Some elderly people tried to stop the children and asked them not to talk on such things in public. The children convinced the elders about the need for the programme and on understanding their point of view, the elders also joined the campaign.

1. Why is such awareness programme necessary?
2. What role has the government played in controlling population explosion?
3. When were reproductive health programmes initiated in India?
4. What values did Rohit and his friends show on the occasion?

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
Suggest a technique that can help the couple to have a child where the problem is with the male partner.

Name the special type of tissue enabling plants like lotus and water hyacinth to survive in aquatic environment. Mention any two specific functions of this tissue?

Expand 'BAC' and 'YAC'. Explain how they were used in sequencing of human genomes.

Match the column first with column second correctly :

If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis? Write the use of this technique and give reason to justify the ban.