What are insecticides?

Plants which grow in shade are called ........

Bio-magnification means ......

Zoos are examples for ..........

The temperature of two cups of coffee are 90°C and 75°C . If the time taken for the first cup to cool from 90°C to 80°C is 15 minutes, then the time taken for the second cup to tool from 75°C to 65°C will be:

A definite amount of mechanical work is needed to produce a definite amount of heat and vice versa this given by: