18. Why is it necessary to dry the harvested food grains before storage?
19. How do weeds affect the growth of crops?
20. Why is weeding necessary?
21. How do grains are stored and preserved?
22. List the main agricultural practices involved in agriculture.
23. What is crop rotation? Write its importance.
24. Some farmers put dried leaves of neem in an iron drum containing wheat. Why?
25. Why is it necessary to sow seeds at appropriate depth?
26. Is the time and frequency of irrigation same for all the crops?
27. Why is irrigation necessary?
Answers
Answer:
ans=20 to remove unwanted plants from crop it will help your crop to grow well
Answer:18)it is because it may have some dust and waste water and insects inside it. So it is being dried in the sun.
19)weeds absorb the nutrients from the soil and affects the crops.
20)if wedding is not done then plants will die.
21) grains are stored in silos and granaries.
22)ploughing the land , sowing of seeds , applying of weedicides , growth of crop , harvesting , winnowing and storing.
23)growing different crops in different seasons for the nourishment of soil is called crop rotation.
24)because insects are afraid of neem leaves and they won't come to eat the wheat.
25)because if wee put in deep means water can't able to go there then if we put at the surface means birds will eat it.
26)no it may differ due to rainfall, climate and soil texture .
27)because it will loose the soil and bring the minerals up so plants can grow.
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