Name the phenomenon responsible for the spherical shape of liquid drops.

Name the chemicals responsible for acid rain ?

Study the given aquatic food chain and answer the questions that follow: (i) Give reasons why there is a continuous increase in the DDT content in different trophic levels of the chain. (ii) Name the phenomenon responsible for the increase in DDT content.

Name the phenomenon which is responsible for bending of light around sharp corners of an obstacle. Under what conditions does this phenomenon take place ? Give one application of this phenomenon in everyday life.

A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.

Name the substances responsible for permanent hardness

The rain are in spherical shape due to

Name a protozoan responsible for malaria in humans.

Jatin puts a pencil into a glass container having water and is surprised to see the pencil in a different state. Name the phenomenon responsible for the change.

A cell that is spherical in shape is :

Name the agranulocytes responsible for immune response of the body