What are weeds? Why are they harmful to crops?

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Solution

Weeds are undesirable plants that grow with crops.

Weeds affect the growth of the crop as they compete with crops for sunlight, water and nutrients.

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Similar questions

Q. Given below are statements about the harmful effects of weeds on crop plants. Choose the correct statements.
(i) They interfere in harvesting.
(ii) They help in the proper growth of crop plants.
(iii) They compete with crop plants for water, nutrients, space and light.

Q. Weeds not only use nutrients from the soil but are also
a. Harmful for some organisms including human beings.
b. Useful to the crops and harmful for human beings.
c. Harmful to the crops and some animals.
d. Crop specific.
Select the alternative which includes all the correct statements.

Question 8
Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere in harvesting.
(ii) They help crop plants to grow healthily.
(iii) They compete with crop plants for water, nutrients, space and light.
(iv) They affect plant growth.

Choose the correct combination of statements.
(a) i, iii, iv
(b) iii only
(c) iii, iv
(d) i, ii, iii, iv

Q. Select the correct option.

Assertion : When the crop is changed during crop rotation, the weeds associated with it usually disappear.

Reason : The weeds are very choosy about the crop with which they grow.

Q. A farmer's crops are being destroyed by aphids. He has been taught not to use insecticides as they have harmful effects. What can he use as an alternative?

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What are weeds? Why are they harmful to crops?

Weeds are undesirable plants that grow with crops. Weeds affect the growth of the crop as they compete with crops for sunlight, water and nutrients.

Weeds are undesirable plants that grow with crops.

Weeds affect the growth of the crop as they compete with crops for sunlight, water and nutrients.