Question 7
Which of the following is not true for fertilizers?

(a) They increase the yield.
(b) Their excessive use disturbs the balance of nutrients in soil.
(c) They are generally used in small quantity.
(d) They are environment friendly.

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Solution

(d) They are environment friendly.

Fertilizers are detrimental to the environment in excess. Unused fertilizers wash up along with the irrigation runoff and end up in water bodies leading to eutrophication of the water bodies resulting in killing of aquatic life.

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Question 8
Among the given options, which one is not correct for the use of a large amount of fertilisers and pesticides?

(a) They are eco-friendly
(b) They turn the fields barren after some time
(c) They adversely affect the useful component of the soil
(d) They destroy the soil fertility

Q. Question 8
Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides?

(a) They are eco-friendly
(b) They turn the fields barren after some time
(c) They adversely affect the useful component from the soil
(d) They destroy the soil fertility

Choose the correct option for the following statements:

Statement A: Fertilizers are eco-friendly and safe to use.

Statement B: Fertilizers provide necessary nutrients and help in increasing the yield of the crops.

Assertion:- Plastics are not environment-friendly still, they are used. Choose the correct reason(s) for this assertion.

Q. Read the following statements.

(i) Irrigation protects the crops from both frost and hot air currents.
(ii) Plants can absorb nutrients mostly in dissolved form.
(iii) Excessive use of chemical fertilizers disturbs the balance of nutrients in the soil.
(iv) The process of loosening and turning the soil is called digging(or leveling)
(v) Rabi crops, such as paddy, require a lot of water and therefore they are sown at the beginning of the south-west monsoon, during June or July.

Select the incorrect combination of statements.

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Water Pollution

Standard VIII Chemistry

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Question 7 Which of the following is not true for fertilizers? (a) They increase the yield. (b) Their excessive use disturbs the balance of nutrients in soil. (c) They are generally used in small quantity. (d) They are environment friendly.

(d) They are environment friendly. Fertilizers are detrimental to the environment in excess. Unused fertilizers wash up along with the irrigation runoff and end up in water bodies leading to eutrophication of the water bodies resulting in killing of aquatic life.

Question 7
Which of the following is not true for fertilizers?

(a) They increase the yield.
(b) Their excessive use disturbs the balance of nutrients in soil.
(c) They are generally used in small quantity.
(d) They are environment friendly.

(d) They are environment friendly.

Fertilizers are detrimental to the environment in excess. Unused fertilizers wash up along with the irrigation runoff and end up in water bodies leading to eutrophication of the water bodies resulting in killing of aquatic life.