Q22 of 49 Page 89

Why is organic matter important for crop production?

The Organic matter is important for crops because

(a) it helps in improving soil structure.


(b) it helps in increasing water holding capacity of sandy soil.


(c) in clayey soil large quantity of organic matter helps in drainage and in avoiding water logging.


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What is a GM crop? Name any one such crop which is grown in India.

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List out some useful traits in improved crop?

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Why is excess use of fertilizers detrimental for environment?

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Give one word for the following

(a) Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as_______


(b) Growing of wheat and groundnut on the same field is called as ________


(c) Planting soybean and maize in alternate rows in the same field is called as _______.


(d) Growing different crops on a piece of land in pre-planned succession is known as_______.


(e) Xanthium and Parthenium are commonly known as_________.


(f) Causal organism of any disease is called as ________.