Disadvantages of chemical agents are I. chemicals are toxic and harmful to human beings and animals

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8.Microbes in Human Welfare

normal

Disadvantages of chemical agents are

$I.$ chemicals are toxic and harmful to human beings and animals

$II.$ chemicals pollute the environment and plants

$III.$ weedicides used to remove weeds also pollute the soil

Choose the correct option

$I, II$ and $III$

$I$ and $II$

$I$ and $III$

$II$ and $III$

Solution

Commercial chemical fertilisers are more expensive than natural fertilisers. They may contain ingredients that may be toxic to the skin or respiratory system. Chemical fertilisers help increase the productivity of many garden plants and keep desirable plants healthy. But their use is also a major cause of many forms of pollution. Chemical fertilisers can build up in the soil, causing long-term imbalances in soil pH and fertility

Standard 12

Biology