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SUBJECT: SCIENCE, CLASS - VIII, ASSIGNMENT NO: 1, CHAPTER — CROP PRODUCTION, , Q1. Fill ups:, , eS? hy, , yy, , compete with main crops for nutrients., Grains are separated from harvested crops by using &, Excess water in the fields may cause a condition called ;, , bacteria lies in the root nodules of leguminous plants helps, , in fixing of atmospheric nitrogen., Bulk storage of grains is done in & ;, The produced crop is stored in different containers, after being sundried, to, prevent the attack of, , , , , , Q2. Name the following:, , iM, 2., , Bw, , ~, , Equipment used to level the tilled land., , Process of leaving the land uncultivated for one or more, , seasons., , Management & care of domestic animals., , Man made chemical substance rich in inorganic nutrients., , Separation of grain from its chaff or husk after threshing with the help of, wind., , An agricultural implement used to sow seeds., , The process of removing weeds from the field., , Organisms which cause damage to the crops & make them unfit for human, consumption., , Q3. Match the following:, , PRs e hy S, , Harvesting (a) Rabi, , Wheat (b) Fertilizer, , Grass © Agricultural implement, Irrigation (d) Sickle, , Urea (e) Weed, , Plough (f) Drip system
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Q4. Choose the correct option:, , 1. Which of the following is/are post harvesting technique(s)?, (a) Winnowing (c) Storage of food grains, (b) Threshing (d) All of these, , 2. NPK fertilizers contains, (a) Nitrogen ,Potassium & Calcium _—__(c) Nitrogen, Phosphorus& Potassium, , (b) Nitrogen, Potassium & Phosphorus (d) Nitrogen, Phosphorus &Keratin, , 3. Manual removal of weeds is done by:, , (a) Trowel (c) Insects, , (b) Weedicides (d) Tilling, 4. Major source of water in fields is:, , (a) River (c) Ponds, , (b) Tube wells (d) Rainfall, , Q5. What is crop rotation?, , Q6. Why organic manure is considered better than chemical fertilizer?, , Q7. What precautions should be taken care while storing harvested grains?, Q8. List some advantages of preparing soil., , Q9. A farmer was using lot of fertilizers for the improvement of his produce, , from the field. List any two harmful effects of fertilizers on environment., How will you convince him to restrict the use of fertilizers?
