Question 6
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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Solution

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

Competition for mineral nutrients $\to$ and nutrients. Thus causing heavy losses in yields.

Weeds compete for mineral nutrients.

They consume large amount of water, sunlight and nutrients leaving non-weed plants starving

Weeds grow at such a rapid rate, they often absorb more of one nutrient than another, leaving an imbalance.

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Question 6
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.

Q. Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere while harvesting.
(ii) They help crop plants grow healthily.
(iii) They compete with crop plants for water, nutrients, space, and light.
(iv) They affect plant growth.
Choose the correct statements from above.

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. Weeds compete with the crop plants for water, nutrients, space, and light.

Q. Assertion (A) : Weeds should not be allowed to grow along with the crops.
Reason (R) : Weeds leave no space for plants to grow.

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Weeds

Standard IX Biology

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Question 6 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.

Question 6
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.