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Science11. 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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