Question

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Answer 1

Answers :-

a) Undesirable plants that compete with plants for nutrients, sunlight, water and space

•  Answer - Weeds

Explanation -

Weeds are unwanted plants which grow themselves and spread very fast and it is very necessary to remove them from time to time otherwise they will absorb the nutrition from the soil which is for the crop we have grown in the field.

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b) Large cylindrical containers for storage of grains

•  Answer - Silos

Explanation -

The grains are kept in large scale storage done in Silos to prevent the grains from getting spoilt by microbes.

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c) Cutting of mature crop

• Answer - Harvesting

Explanation -

Once the crop matures, it is harvested [ cut ] and gathered. This may be manually done using a sickle or by using a machine called Harvester.

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d) Separation of grains from chaff using wind

• Answer - Winnowing

Explanation -

After threshing, the grain has to separated from the chaff. This can be manually done with the help of wind and is called winnowing.

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e) Bacteria that helps to fix atmospheric nitrogen

• Answer - Rhizobium Bacteria

Explanation -

Some of the complex organic compounds are taken up by plants and rest are converted into nitrates by nitrifying bacteria called Rhizobium bacteria.

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