Explain any one method of crop production which ensures high yield.

Explain any two chemical methods of food preservation.

Which of the following statement/s is/are and example of genetic engineering? I. Inserting a gene for human insulin production into bacteria. II. Selective breeding to produce cattle with high milk yields. III. Using methods like crop rotation with leguminous plants to increase the fertility of the soil. IV. Vegetative propagation and grafting are practised to ensure higher yield.

Explain the various methods of crop improvement. Name one improved variety of Rice, Maize, Soyabean, Sunflower and Mustard.

Which factors influence the crop production?

Best method of improving crop yield is:

Describe the breeding of crop plants for disease resistance and high yield.

Which is the oldest method of crop improvement ?

The given pie chart represents the annual yield of certain crops in tons. If the total production is 9000 tons, then the yield of rice is_______ tons.