Q. What is the process of manufacturing of food in green plants known as?

A. Photosynthesis

Q. What is Astronomical measure of distance called?

A. Light year.

Q. The layer that protects the earth from Ultra-violet radiations?

A. Ozone layer.

Q. What is known as the "ship of the desert"?

A. Camel.

Q. Bird born out of the largest egg?

A. Ostrich.

Q. Volcanes that erupts in hundred or thousand years?

A. Dormant Volcano. After eruption no volcanic activity takes place and gradually they become covered with vegetation or cities. For examples,  Mauna Kea on the Island of Hawaii.

Q. What is the rain containing chemical waste known as?

A. Acid Rain which has a harmful effect on palnts and aquatic animals. It is caused by the emmission of sulphur dioxide (SO2), carbon dioxide  (CO2) and nitrogen oxide which reacts with water in the atmosphere.

Q. Are Whales fishes?

A. Whales are aquatic mammals who spend their entire life in water. They give birth to young ones and have mammary glands with which they feed their young. Like mammals they breathe air into lungs and have four-chambered heart.

Q. Which gas is responsible for the green house effect?

A. CARBON DIOXIDE (CO2)

Q. How can soil erosion be prevented?

A. BY AFFORESTATION

Q. When is Earth Day observed?

A. ON APRIL 22

Q. When is the World Environment Day observed?

A. ON JUNE 5

Q. What does Fujita scale indicate?

A. IT IS THE SCALE FOR RATING TORNADO INTENSITY

Q. What percentage of earth's water is fresh water?

A. ONLY 2.5%