Human Reproduction — BIOLOGY STD 12 Science — Question

Write a short note on Adaptations of desert animals.

What are the unique features of acquired immunity?

Name and explain three adaptations of mangroves to the conditions prevailing in Sunderbans (West Bengal).

Explain with the help of two examples, how certain plants have evolved morphological and chemical defenses against primary consumers such as cows and goats.

Explain any three measures which will control vehicular air pollution in Indian cities.

Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organised an awareness programme entitled "Bury not burn'. They invited you, being a biology student to participate.

1. How would you justify your arguments that promote burying and discourage burning? (Give two reasons).
2. With the help of flowcharts, one for each practice, depict the chain of events that follow.

Transplantation to save certain patients often fails due to rejection by the patient. What is transplantation? Which type of immune response is responsible for such rejections?

Differentiate between primary and secondary succession. Provide one example of each.

Enlist the meninges of human brain.