Answer the following questions:
Q.1 Why is weeding necessary?
Q.2. What kind of seeds to be required to get good crops ?
Q.3 Difference between natural fibres and synthetic fibres.
Q.4. Write an activity to demonstrate that liquid pressure varies with depth.
Q.5. What are the characteristics of Electrostatic force.
Q.6. Write the characteristics of Magnetic force.
Q.7. What are the advantages of synthetic fibres over natural fibres?
Q.8. What are the uses of plastics in our life?
Q.9. Ram has a cotton shirt and a shirt made from synthetic material. Which shirt is
suitable summers ? Explain.
Q.10 How Rayon is obtained ?
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Answer:
1) Weeding is an important control method practiced in many crops. The removal of weeds is useful because these unwanted plants compete with the crop for space, water and nutrients. ... Weeding also helps to loosen the soil. Water can infiltrate more rapidly and roots of the cultivated plants can develop in a better way.
Explanation: