Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

What are chasmogamous flowers?

Can cross-pollination occur in cleistogamous flowers? Give reason for your answer.

Mention two strategies that evolved to prevent self-pollination in flowers.

What is self-incompatibility?

Why does self-pollination not lead to seed formation in self-incompatible species?

What is the bagging technique?

What is meant by emasculation?

Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)

Discuss the causes of global warming.

Discuss briefly about Greenhouse gases

Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.

Describe the structure of its microsporangium.

Write the names of the following:

A 15 mya primate that was ape-like

Write the names of the following:

A 2 mya primate that lived in East African grasslands

"Man can be a primary as well as a secondary consumer." Justify this statement.

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

Name the greenhouse gases that contribute to global warming.

List the greenhouse gases other than carbon dioxide.

Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.

Answer the following question.
Write two differences between Homo erectus and Homo habilis.