Explain the scientific reason for growing a leguminous crop like groundnut prior to cereal crop.

Why do farmers use leguminous crops to provide nitrogen to the soil?

Why are leguminous plants cultivated as green manure crops?

Give two reasons for keeping beehives in crop fields during flowering period.

Explain the process of artificial hybridisation to get improved crop, variety in (i) plants bearing bisexual flowers (ii) female parent producing unisexual flowers.

A man made allopolyploid cereal crop is

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non leguminous terrestrial crop (a) Recommend two microbes that enrich the soil with nitrogen (b) Why do leguminous crops not require such enrichment of the soil ?

Prior to sowing rice, why was a legume crop cultivated and ploughed back into the field?

Assertion : Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops. Reason : A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the crop with which the bacterium is associated .

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.