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

Wonder wheat is new wheat variety developed by

Assertion : Lichen is important for chemical industries.

Reason : Litmus and Orcein are formed from lichens.

Which one of the following pesticides is banned now-a-days?

The infectious agents made up of $RNA$ only are