Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

Which one of the following combination would a sugarcane farmer look for in the sugarcane crop?

Fungicides and antibiotics are chemicals that ______.

Use of certain chemicals and radiation to change the base sequences of genes of crop plants is termed ______.

The scientific process by which crop plants are enriched with certain desirable nutrients is called ______.

Lysine and tryptophan are ______.

The agriculture sector of India employs about ______.

33 percent of India’s Gross Domestic Product comes from ______.

A collection of all the alleles of all the genes of a crop plant is called ______.

In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.

Name a man-made cereal? Trace how it was developed and where is it used?

What is meant by ‘hidden hunger’?

What is emasculation? Why and when is it done?

Discuss the two main limitations of plant hybridization programme.

Give two important contributions of Dr. M. S. Swaminathan.

The term ‘desirable trait’ can mean different things for different plants. Justify the statement with suitable examples.

It is said, that diseases are spreading faster due to globalisation and increased movement of people. Justify the statement taking the example of H5N1 virus.

Life style diseases are increasing alarmingly in India. We are also dealing with large scale malnutrition in the population. Is there any method by which we can address both of these problems together?

What is meant by germplasm collection?

Name the improved characteristics of wheat that helped India to achieve green revolution.

Suggest some of the features of plants that will prevent insect and pest infestation