Question 5
Read the statements given below:
(i) Seeds require moisture for germination.
(ii) Plants can absorb nutrients mostly in dissolved form.
(iii) Irrigation protects crops from both frost and hot air currents.
(iv) Irrigation improves soil texture.

Choose the combination of statements which indicate the need to irrigate crops.
(a) i and ii
(b) i, ii, iii
(c) i, ii, iii, iv
(d) i and iii

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Solution

(b) i, ii, iii
This implies that Seeds require moisture for germination, Plants can absorb nutrients mostly in dissolved form, and Irrigation protects crops from both frost and hot air currents.
Soil texture is improved by manures. Irrigation plays no part in improving soil texture.

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Similar questions

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.

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

Question 30
Choose the forms in which most plants absorb nitrogen

(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Q. Question 24
It is important to make small check dams across the flooded gullies because they
(i) hold water for irrigation
(ii) hold water and prevent soil erosion
(iii) recharge groundwater
(iv) hold water permanently.

(a) (i) and (iv)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iv)

Question 30
Choose the forms in which most plants absorb nitrogen

(i) Proteins
(ii) Nitrates and Nitrites
(iii) Urea
(iv) Atmospheric nitrogen

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

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Irrigation

Standard VIII Biology

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(b) i, ii, iii This implies that Seeds require moisture for germination, Plants can absorb nutrients mostly in dissolved form, and Irrigation protects crops from both frost and hot air currents. Soil texture is improved by manures. Irrigation plays no part in improving soil texture.

(b) i, ii, iii
This implies that Seeds require moisture for germination, Plants can absorb nutrients mostly in dissolved form, and Irrigation protects crops from both frost and hot air currents.
Soil texture is improved by manures. Irrigation plays no part in improving soil texture.