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What is double displacement reaction

Describe briefly about animal husbandry? (3) Ans. a. Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, eggs, or other products. b. It includes day-to-day care, selective breeding and the raising of livestock, like plants, animals also provide us with large variety of food items for which they are reared domestically or commercially. c. They are provided with proper food, shelter and care, this is called animal husbandry. 7. Why do you think removal of weeds is essential? Write any one method to control weeds. (2 + 1) Ans. Removal of weeds is essential because they compete with the crops for water, nutrients and other basic necessities which affects the growth and results in low yield of crops. With the help of Khurpi, weeds are cut close to the ground from time to time. Another method is using weedicides like 2,4 D which helps to control weeds. 8. What is crop rotation? Why is it important? (2 + 1) Crop rotation is a method of replenishing the soil with nutrients and this is done by growing different crops alternatively. For example, growing legumes as fodder in one season and wheat in the next season. It is important because it helps in replenishing of soil with nitrogen. List the advantage of manure over fertilisers. Ans. a. Manure improves the water holding capacity of the soil. b. It improves the texture of the soil. c. It increases the number of friendly microbes. Define harvesting. Ans. Harvesting is the cutting of mature crop manually or by machines. Crops are harvested either by pulling out the crops from the field or cutting close from the ground. Harvesting in our country is either done by sickle or by a machine called harvester. Choose the odd one out and give reason for the same. moat, dhekli, sickle, rahat Ans. Sickle. Except sickle all are traditional methods of irrigation, whereas sickle is an instrument which is used for harvesting crops. Correct the following statements. a. Separation of grains from the chaff is called weeding. b. Manure is a man-made inorganic salt. Ans. a. Separation of grains from the chaff is called threshing/winnowing. b. Fertiliser is a man-made inorganic salt. www.vedantu.com

Describe briefly about animal husbandry? (3) Ans. a. Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, eggs, or other products. b. It includes day-to-day care, selective breeding and the raising of livestock, like plants, animals also provide us with large variety of food items for which they are reared domestically or commercially. c. They are provided with proper food, shelter and care, this is called animal husbandry. 7. Why do you think removal of weeds is essential? Write any one method to control weeds. (2 + 1) Ans. Removal of weeds is essential because they compete with the crops for water, nutrients and other basic necessities which affects the growth and results in low yield of crops. With the help of Khurpi, weeds are cut close to the ground from time to time. Another method is using weedicides like 2,4 D which helps to control weeds. 8. What is crop rotation? Why is it important? (2 + 1) Crop rotation is a method of replenishing the soil with nutrients and this is done by growing different crops alternatively. For example, growing legumes as fodder in one season and wheat in the next season. It is important because it helps in replenishing of soil with nitrogen. 9. List the advantage of manure over fertilisers. (3) Ans. a. Manure improves the water holding capacity of the soil. b. It improves the texture of the soil. c. It increases the number of friendly microbes. 10. Define harvesting. (2) Ans. Harvesting is the cutting of mature crop manually or by machines. Crops are harvested either by pulling out the crops from the field or cutting close from the ground. Harvesting in our country is either done by sickle or by a machine called harvester. 11. Choose the odd one out and give reason for the same. (1 + 1) moat, dhekli, sickle, rahat Ans. Sickle. Except sickle all are traditional methods of irrigation, whereas sickle is an instrument which is used for harvesting crops. 12. Correct the following statements. (1 + 1) a. Separation of grains from the chaff is called weeding. b. Manure is a man-made inorganic salt. Ans. a. Separation of grains from the chaff is called threshing/winnowing. b. Fertiliser is a man-made inorganic salt.

Give four examples of fertilizers. (2) Ans. Urea, ammonium sulphate, super phosphate, potash, NPK etc. What do you mean by the term irrigation? (2) Ans. The supply of water to crops at appropriate intervals is called irrigation. The time and frequency of irrigation varies from crop to crop, soil to soil and season to season. If a handful of seeds are given to you, how will you separate healthy seeds from damaged ones? (2) Ans. Take a beaker half filled with water and put some seeds into it and stir well, wait for some time. You will observe that some seeds sink in water while some seeds float on water, damaged seeds become hollow and lighter and thus they float on water.