Question

class 8 NCERT chapter 1st science
1.how grain are stored and preserved?
2.explain harmful effects of pesticides​

Answer 1

Answer:

• The food grains obtained by harvesting the crops are dried in the sunshine before storing to reduce their moisture content.It is necessary to prevent them from spoilage.

• The higher moisture content in food grains promotes the growth of fungus and moulds on the stored grains which damages them.

• The farmers store the dried food grains at home in metal bins (metal drums) and jute bags(gunny bags).Dried neem leaves are used for storing food grains at home.

The government agency like Food Corporation of India(FCI) buy grains from farmers on large scale and store it in big godowns.

The large scale storage of food grains is done in two ways:

1)In gunny bags

In gunny bags2)In grain sillos

Pesticide solution are sprayed on the stacked gunny bags in the godown from time to time to protect them pests during storage.

• 2.Pesticides secrete into soils and groundwater which can end up in drinking water, and pesticide spray can drift and pollute the air.
• The effects of pesticides on human health depend on the toxicity of the chemical and the length and magnitude of exposure. .
• Toxic residue in food may contribute to a child's exposure.

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Answer 2

Introduction:

1. After Harvest Crops Are Preserved to Put that crops in Sunshine to remove moisture and prevent from fungi.
2. Then, After Many Process It Converted To Grains and This Grains are stored in Silos and Gunny-Bags.
3. Pesticides are Made of Many Harmful chemicals and when these pesticides sprayed on crops it got inside the crop and some on soil which causes Water and Land Pollution after rain it contaminated groundwater.

From Pesticides Grains Many Disease Will Causes Such as Diabetes,Cancer and So on. But These Diseases Are Unknown.

Thank You.

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