Science (English Medium) Class 12 - CBSE Important Questions for Biology

“India has greater ecosystem diversity than Norway.” Do you agree with the statement? Give reasons in support of your answer.

Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisation.

Explain the formation of placenta after the implantation in a human female.

Describe the structure of a nucleosome.

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

Write the effects of heroin on the human body.

Describe the process of amplification of the “gene of interest” using the PCR technique.

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

Explain adaptive radiation with the help of a suitable example.

What is ‘biofortification’?

What are methanogens?

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

Why are baculoviruses considered good biocontrol agents?

Suggest two advantages to a farmer for using apomictic seeds of hybrid varieties.

Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it. 

Explain, giving three reasons, why tropics show greatest levels of species diversity.

Explain the post-pollination events leading to seed production in angiosperms.

List the different types of pollination depending upon the source of pollen gain.

Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.

Why angiosperm anthers are called dithecous?