1. The most abundant gaseous component of air is.

• A) Nitrogen
• B) Sulphur
• C) Oxygen
• D)Carbon Dioxide

2. Which of the following is True?

• A) All plants are autotrophs
• B) All animals are heterotrophs
• C) Some plants are heterotrophs
• D) Human beings are purely carnivorous in their feeding pattern.

3. The gas that plants release and animals absorb is ?

• A) Nitrogen
• B) Sulphur
• C) Oxygen
• D)Carbon Dioxide

4. The percentage of oxygen in our atmospheric air is?

• A) 78%
• B) 88%
• C) 21%
• D) 0.7%

5. The nutritional component found inside the soil and is used by the plants is.

• A) Nitrogen
• B) Oxygen
• C)Sulphur
• D) Carbon Dioxide

6. Gas with least weight among the following is?

• A)Hydrogen
• B)Carbon dioxide
• C) Nitrogen
• D) Oxygen

7. Which of the following are correct related to global warming?

• A) It is caused by greenhouse effect.
• B) It is due to deforestation
• C) It is due to industrialization
• D)All the above are correct

8. Regarding atmospheric gases, mention the wrong statement among the following

• A) Gases have no weight
• B) Gases occupy space
• C) Each gas has different density or weight.
• D) Gases are not visible to the naked eyes

9. Planting more trees to purify the air is called?

• A) Deforestation
• B) Afforestation
• C)Conservation
• D) None of these

10. Choose the statement that defines ozone from the following?

• A) Ozone is a mixture of many gases.
• B) Ozone has a lot of hydrogen gas.
• C) It is the envelope at the top layer of the atmosphere to protect us from UV rays.
• D) It is harmful to animals

11. Oxygen and carbon dioxide are exchanged between plants and animals by the process of ?

• A) Photosynthesis
• B) Transpiration
• C) Respiration
• D) All the above

12. Humidity refers to the ?

• A)Presence of moisture in the air
• B) Presence of heat in our air
• C) A and B are correct
• D) A and B are Wrong

13. Moving air is also known as ?

• A) Wind
• B) Tornado
• C) Breeze
• D) All the above

14. Identify the wrong statement about oxygen among the following.

• A)It supports burning
• B) Mountaineers carry it in cylinders
• C) It is used as fire extinguisher.
• D)It is released by plants after photosynthesis

15. The lowest layer of our atmosphere is?

• A)Troposphere
• B) Lithosphere
• C) Stratosphere.
• D)Ionosphere