Multiple choice general knowledge

How does the supply of nitortgen in grains take place?

  1. From old leaves

  2. From plant roots

  3. From stem

  4. By photosynthesis
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A Correct answer
Explanation

In grain crops like wheat and rice, nitrogen supply during grain filling comes primarily from the remobilization of nitrogen stored in older leaves, which senesce and transfer their nutrients to developing grains. Roots absorb nitrogen from soil but don't directly supply it to grains, while the stem (Option C) mainly transports nutrients and photosynthesis (Option D) produces carbohydrates, not nitrogen.

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