Mention three ways each by which bacteria and fungi cause harm to the environment.

Mention any three ways by which potable water can be contaninated.

In which ways are bacteria useful to our environment and us?

Name three gases which cause acid rain.

Give any two ways in which biodegradable substances would affect the environment

Mention two ways by which the spinal cord is protected in our body.

We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realise that the improper disposal of waste is harmful to the environment.

Mention the two ways in which transpiration helps the plants.

Give any two ways in which non-biodegradable substances would affect the environment

Which is correct about cell wall of bacteria and fungi ? Both have

What is vaccination ? Mention the four ways in which vaccines are prepared, giving the name I of one disease for which each type of vaccine is used.