Q5 of 67 Page 411

Name three factors for which crop variety is improved.

The three factors for improving crop variety are:

Resistance: Various biotic factors like insects, parasites, diseases, etc. and abiotic factors like hot, cold, drought, salinity, etc. affect the crop production. Developing resistance to both living and non-living factors can give a high yield.


Maturity period: The short growth period of crops helps farmers in multiple rounds of cultivation in less expenditure. Also, the uniform maturity of crops makes them easy to harvest.


Adaptation: It will develop tolerance and allows the crops to grow under different climatic conditions and in different areas. (All points are with Explanation)


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Paddy, Wheat, black gram, cotton, gram and peas.

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Identify the cross performed between two plants belonging to different species.

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Name the nutrients provided by air and water.

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Micronutrients are required by plants in smaller quantities. From the list given below, select only micronutrients required by plants.

N, P, K, Ca, Mg, S, Zn, Cu, Mb and Cl–