11. The harvested grains are stored without drying by a farmer. List the consequences.
12. Write four differences between threshing and winnowing.
13. The use of fertilisers should be limited. Why?
14. Different crops are grown in different crop seasons. Explain this statement with examples.
15. We use dried neem leaves for storing food grains. explain
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Answers
Answer:
11) If freshly harvested grains are stored without drying they may get spoilt or attacked by microorganisms, loosing their germination capacity. Hence, before storing them the grains are properly dried in the sun to reduce moisture in them.
12) Write four differences between threshing and winnowing.
...
1 Answer.
Threshing Winnowing
Threshing is also carried out with the help of a machine called 'combine'. Winnowing is also carried by a winnowing machine.
It is done before winnowing. It is done after threshing
13) Fertilisers are chemicals, rich in a particular nutrient. Limited use of fertilizer increases crop yield. ... Fertilisers also cause water pollution, causes death of aquatic animals. Therefore, farmer should limit the use of chemical fertilizers in order to maintain the fertility of the soil.
14) Different crops require different temperature, moisture content and soil condition to grow. Our country has different seasons hence, different crops are grown. For examples crops like paddy, maize, sorghum, sugarcane, and pearl millets are sown in the months of June-July and harvested in September-October every year.
15) Stored food grains are prone to attack by insects, pathogens and other rodents. Storing food grains along with neem leaves repels the insects attacking the food grains. ... Dried neem leaves are used for storing food grains because they absorb moisture from them.
Explanation:
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11)The various consequence if the farmer stores freshly harvested grains are :-
1. Freshly harvested grains contain more moisture. If freshly harvested grains (seeds) are stored without drying, grains get damaged leading to a loss in their germination capacity.
2. Grains containing moisture can get attack by insects pest, bacteria and fungi.
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12) Threshing :
- It is the process of separation of grain from the stalk on which it develops and from the chaff or unit that covers it.
Winnowing :
- The name given to the method of extracting the grain from the chaff is Winnowing.
Threshing :
- Threshing is carried out with the help of a machine called 'combine'.
Winnowing :
- Winnowing is carried by a winnowing machine.
Threshing :
- It is done before winnowing.
Winnowing :
- It is done after threshing
Threshing :
- Traditionally It is done by striking harvested crop against hard surface.
Winnowing :
- It is done with the help of wind separation of grain is done.
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13) The use of fertilizers should be reduced/limited bcoz excess of fertilizers can kill plants or the amount of nutrients in the soil will get reduced. In same way animals will also get affected by it when they eat such plants.
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14) Different crops are grown in different regions because growing the crops depends on factors such as favourable topography of soil, demand of produce, type of climate, amount of rainfall, technology and labour.
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15) This is because they absorb moisture from food grains.
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