Question 4
Which stage of human beings is
called Hunters and Gatherers ?
The primitive man
The Settled man
The humans of Indus
Valley
The humans of Vedic age
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Biotic factors such as pests, insects and diseases reduce the crop production. A pest causes damage to our crops by feeding. Weeds also reduce crop productivity by competing with the main crop for nutrients and light. ... affect the net crop production.
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