Question

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#question in attachment

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Answer 1

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1️⃣Raw vegetables and fruits get easily infected by microorganisms and get spoilt. They are kept in refrigerator as low temperature inhibits growth of microbes. Jams and pickles contain sugar and salt as preservatives. They do not get infected by microbes easily.

2️⃣Fresh milk is boiled before consumption to kill the microorganisms in it. But packed milk is pasteurised and does not contain any microorganisms. It can thus be consumed without boiling.

3️⃣Beans and peas are leguminous plants and have Rhizobium in their root nodules. These bacteria can fix atmospheric nitrogen to enrich the soil with nitrogen and increase its fertility.

4️⃣Though mosquitoes live on land, their larvae grow in water. If water stagnation is prevented the larvae cannot survive.

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Answer 2

a) raw vegetables get dried when they are kept outside for long. they need to be in a very cold temperature as microorganisms cannot survive cold temperature. While pickles and jams contain preservatives which are made to keep the door preserved.

b) fresh milk is boiled to kill the bacterias present in it because microbes cannot survive very cold or hot environment. Packed milk is already boiled and cooled (pasteurized) to make is microbes free.

d) mosquitoes can be prevented stagnation of water as mosquitoes prefer to lay their eggs in stagnant or still water.