Grasses are capable of regeneration in spite of continuous grazing by cattle. Suggest the reason for it.

A dog expires CO_2 , How can you correlate the relationship between the dog and grazing cattle in terms of CO_2 .

A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.

Suggest the reason for the presence of DDT in water.

pH of blood remains constant in spite of the variety of goods and spices we eat. Give a reason.

The major findings of a health survey conducted in a corporation area are 1) 25% of the population are suffering from hypertension. 2) 15% of male above 40 years are suffering from various cardiac disorders. Suggest any two possible reason for this disorders.

What are the suggested reasons for population explosion?