Earth as A Habitat

Q. What makes life possible on Earth?

1. It is at a perfect distance from the Sun.
2. The ozone layer protects the Earth from ultraviolet rays.
3. It is very close to Mars.
4. Greenhouse gases keep the Earth warm.

Q. Our atmosphere has __% Nitrogen, __ % Oxygen, and __% other gases like carbon dioxide, argon, and water vapour.

1. 54, 40, 6
2. 78, 21, 1
3. 80, 12, 8
4. 21, 78, 1

Q.

What is ozone gas? What is the distance between Pluto to Sun?

Q. 1. The composition of nitrogen and oxygen in the atmosphere is 78% and 21% respectively.

2. The oxygen cycle is the movement of oxygen in its various forms through the atmosphere.

3. Biosphere is the zone where the hydrosphere, lithosphere, and atmosphere interact with each other.

Select the incorrect statements from the following.

1. Only 1
2. Only 3
3. Only 2 and 3
4. Only 2

Q. Match the following Greek words with their correct translations.

1. Lithos
2. Bios
3. Stone
4. Atmos
5. Hudor
6. Vapour
7. Water
8. Life

Q. What is the meaning of the Greek word Atmos?

1. Soil
2. Land
3. Vapour
4. Season

Q.

What is the percentage of oxygen in the air?

1. 20.9 %

2. 79 %

3. 10 %

4. 0.33 %