NCERT 8th Class (CBSE) Science: Crop Production

Question: What are the advantages of fertilizers?

Answer: Advantages of Fertilizers:

1. Fertilizers give quicker results compared to manure.
2. Use of fertilizers has helped farmers in significantly improving farm yield.

Question: Write a short note on storage of crops.

Answer: Proper storage of harvested crop is important to prevent damage from moisture and pests. Grains are sun dried before being stored. Grains are stored in silos. Silos can be of varying heights; ranging from one meter to several meters. Fruits and vegetables are stored in cold storage. Suitable pesticides are used while storing grains. Neem leaves are also used as pesticides.

Question: Write a short note on crop rotation.

Answer: In this method, a legume crop is sown between two successive cereal crops. Legume plants harbor rhizobium bacteria in their root nodules. These bacteria help the plants in nitrogen fixation in soil. Thus, growing a legume crop helps in replenishment of nutrients in soil.

Question: What are the advantages of manure?

Answer: Advantages of Manure:

1. Manure increases nutrients in soil.
2. It improved soil texture.
3. It improves water retaining capacity of soil.
4. It is free of any toxic material and thus is environment friendly.

Question: Explain the structure and working of hoe.

Answer: This is used for leveling the soil and for removing weeds. This is made of iron or wood. It is a long beam with a handle. A sharp blade is fixed on one end. This is usually pulled by animals. A hoe is used for leveling the field.