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Weeds affect the crop plants by...

Weeds affect the crop plants by

A

Killing of plants in field before they grow

B

dominating the plants to grow

C

competing for various resources of crops (plants) causing low availability of nutrients

D

All of the above

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The correct Answer is:
d
Weeds are unwanted plants in the cultivated fields they compete with main crop plants for nutrients and reduce the growth of crops in many ways. The seeds of weed germinate easily their seedling grow faster they flower early , their seed production begins after a very short growth period and produce many seeds.
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NCERT EXEMPLAR ENGLISH-IMPROVEMENT IN FOOD RESOURCES-Short Answer Questions
  1. Weeds affect the crop plants by

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  2. Match the column I with the column II.

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  3. Fill in the blanks (a) Pigeon pea is a good source of "" (b) Berse...

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

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  5. List out some useful traits in improved crop ?

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  6. Why is organic matter important for crop production?

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  7. Why is excess use of fertilisers detrimental for environment?

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  8. Give one word for the following (a) Farming without the use of chemi...

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  9. Match the following column I and II

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  10. If there is low rainfall in a village throughout the year. What measur...

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  11. Group the following and tabulate them as energy yielding protein yield...

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  12. Define the tern hybridisation and photoperiod.

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  13. Fill in the blanks (a) Photoperiod affect the "" (b) Kharif crops...

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  14. Cultivation practices and crop yield are related to environmental cond...

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  15. Fill in the blanks (a) A total of "" nutrients are essential to pla...

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  16. Differentiate between compost and vermicompost?

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  17. Arrange these statements in corrent sequence of preparation of green ...

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  18. An Italian bee variety A mellifera has been introduced in India for ho...

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  19. In agricultural practices, higher input gives higher yield. Discuss ho...

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  20. Discuss the role of hydridisation in crop improvement.

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  21. Define "(i) Vermicompost"" ""(ii) G...

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