A symbiotic bacteria.

थोडक्यात उत्तर

Rhizobium

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Distinguish Degradable pollutants - Non-degradable pollutants

List two major harmful effects of the following:

Pesticides such as DDT used in agriculture.

How is soil pollution caused?

What is the effect of pollution on soil?

Name one non-degradable pollutant.

What acts as a storage reservoir for water and other plant nutrients.

Bacteria breaking down dead organisms to liberate nitrogen.

Give Technical Terms:

A free living nitrogen fixing blue-green algae

Fill in the Blanks:

Chemicals intended to kill insects and other organisms that damage crops called ______.

Chemical fertilisers may reach the rivers but do not harm the fish.