The term used for the process of separation of grains from chaff is(a) sieving (c) winnowing(b) threshing (d) hand picking5. 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 iii6. Which of the following tools would a farmer use to remove weeds from the field?(a) Hoe (b) Axe (c) Plough (d) Cultivator7. Which of the following is not true for fertilisers?(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.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, iv (c) iii only (d) i, ii, iii, iv9. The process of loosening and turning of soil is called(a) irrigation and manuring (c) tilling and ploughing(b) digging and winnowing (d) harvesting and storage10. The monsoon season in our country is during the months(a) April to December (c) November to March​