Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Biology

Identify 'A', 'B', 'C' and 'D' in the given table.
 

Plant breeding technique has helped sugar industry in North India. Explain how.

Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason.

How has mutation breeding helped in improving the production of mung bean crop?

Name any two common Indian millet crops.

Describe the changes that occur in ovaries and uterus in human female during the reproductive cycle.

Enumerate four objectives for improving the nutritional quality of different crops for the health benefits of the human population by the process of "Biofortification".

Explain the process of replication of a retrovirus after it gains entry into the human body.

Name the function of the following:

Corpus luteum

What is menstrual cycle?

Which hormones regulate menstrual cycle?

Identify True/False statement. Correct false statement to make it true.

Menstrual cycle ceases during pregnancy.

Correct the following statement:

All sexually transmitted diseases are completely curable.

Explain the Law of Dominance using a monohybrid cross.

What are the various routes by which transmission of the human immuno deficiency virus takes place?

What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?

Briefly describe various steps involved in plant breeding.

Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.

Find out the role of microbes in the following:

Soil

How do biofertilisers enrich the fertility of the soil?