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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 the above

Text Solution

Verified by Experts

The correct Answer is:
D
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Assertion : Weeds are unwanted plants that grow along with the main crops. Reason : Weeds compete with the main crops for water, minerals and sunlight and therefore reduce crop yield.

LAKHMIR SINGH & MANJIT KAUR-IMPROVEMENTS IN FOOD RESOURCES -VERY SHORT ANSWER QUESTIONS
  1. Weeds affect the crop plants by

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  2. Mention the crop whose production has increased by blue revolution and...

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  3. What are plant nutrients ?

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  4. Name the three most important mineral elements required for plant grow...

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  5. What are the micronutrients required by the plants ?

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  6. Name any two macronutrients required by plants.

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  7. Which one is nutrient specific-fertilizer or manure ?

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  8. Which is the oldest method of crop improvement ?

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  9. Name one common disease of paddy.

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  10. Give an example of biological weed control.

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  11. Give one example of natural insecticide.

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  12. What are weeds ?

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  13. Write down two harmful effects of biotic factors on food grains.

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  14. What percent of moisture should be present in the food grains at the t...

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  15. Give one example of solid and one of liquid fumigant.

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  16. Which method is most effective for destroying insects in stored grains...

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  17. How the food grains should be dried on commerical basis ?

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  18. What is feed ?

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  19. Name one (a) Leguminous green fodder, (b) Non-green dry fodder.

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  20. Name one high yielding breed of cow and one of buffalo respectively.

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  21. What are fat content in milk of: (a) Murrah, (b) Surti ?

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