Respiration and Circulation — BIOLOGY STD 12 Science — Question

Egg is liberated from ovary in

Crop plants grown in monoculture are :

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.

1. Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
2. State any two reasons responsible for the cause of infertility.
3. Suggest a technique that can help the couple to have a child where the problem is with the male partner.

Which layer is considered crucial for the existence of the ecosystems on the planet which is depleting due to increased pollution?

The efficiency of any ecosystem is best depicted by pyramid of:

According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of diameter.

Filarial larva can be collected from man's :

Which of the following is homologous organ ?

The annual net primary productivity of the whole biosphere is approximately billion tonnes (dry weight) of organic matter.