Science
11. Why does grain produce on a large scale?
12. How do you select good seed ? Give example.
13. Name some weedicides and why precaution taken on the time of spraying.
14. What is force? State its effect?
15. What is pressure ? Write its SI Unit?
16. State the difference between contact and non contact force ?
17. What is synthetic fibre. Give some example with use.
18. What is plastic ? Write its properties.
19. What is 4R ? Why plastic item not thrown in water?
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Answer:
- Grains are produced in large scale as they are one of the staple foods for the people of the world.
- Good seeds are selected looking at the mother plant.
- Atrazine is a weedicide tat is sprayed covering the mouth and the nose as it is harmful to humans.
- Force is any interaction. Force helps to displace objects from one place to another.
- Pressure is force per unit area. The SI unit is N/m^2.
- Contact force is an interaction that does not touches the object. Example is gravity, whereas contact forces touch the object while acting on it.
- Synthetic fibers are textile fibers made by man and polyester is one of them.
- Plastic is polypropylene that is non-toxic and corrosion resistant.
- Te 4 r of plastic is refuse, reuse, reduce and recycle. They are non thrown in water as plastic is not bio degradable.
Explanation:
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