Strategies for Enhancement in Food Reproduction — BIOLOGY STD 12 Science — Question

In which year was the Air (Prevention and Control of Pollution) Act amended to include noise as air pollution.

High fever, loss of appetite, stomach pain and constipation are some of the symptoms seen in a patient. How would the doctor confirm that the patient is suffering from typhoid and not amoebiasis

Describe the effect of continuously mechanically stirring the sewage and pumping air into it during biological treatment of sewage.

Why does ozone hole form in spring and not in winter?

Give two reasons why a person infected with a venereal disease does not go for timely detection and treatment of it.

Name the group of organisms and the substrate they act on to produce biogas.

Which method is more meaningful for measuring population size?

Define external fertilization.

Who contribute significantly to the balance of nature?

From which germ layers do the following organs differentiate?

1. Kidney.
2. Urinary bladder.