Air and Its Composition

Q.

What percentage of carbon dioxide is present in the atmosphere?

Q.

What are the different layers of the atmosphere?What does atmosphere do?

Q.

Write down the composition of air.

Q. Difference between air and winds

Q.

What is air?

Q.

What are the two forms of oxygen found in the atmosphere?

Q.

What is meant by environment? Why is the environment considered to be a system?

Q.

From where do the plants get carbon, oxygen and hydrogen? What do plants need nutrients for? [3 MARKS]

Q.

The third most abundant gas in the atmosphere is carbon dioxide.

1. True

2. False

Q.

Explain the direction of air movement during the day and night in coastal areas.

Q.

Define atmosphere.

Q.

Carbon Dioxide, Methane and Carbon Monoxide are greenhouse gases.

1. True

2. False

Q.

Perform an activity to measure the temperature of the water, soil, sand, and air in bright sunlight and shade.

Q.

21. While a teacher was teaching her class about air and oxygen she emphasised the importance of nitrogen in the atmosphere. A student named Vivek asked the teacher, What would happen if the percentages of nitrogen and oxygen were interchanged in the atmosphere? The teacher praised him for the question and explained it. What was the teachers explanation?

Q.

A Biosphere Is Composed Of_______.

1. Living Organisms

2. Living Organisms + Lithosphere

3. Living Organisms + Lithosphere + Atmosphere

4. Living Organisms + Lithosphere + Atmosphere + Hydrosphere

Q.

On the moon the temperature ranges from -190 to 110 degrees celsius, this is due to

1. No water bodies present

2. Water bodies present

3. No biogeochemical cycles

4. No atmosphere

Q.

What are the two components of the biosphere?

Q.

When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

1. It moves along with oxygen into the cells

2. It comes out with the CO2 during exhalation

3. It is absorbed only by the nasal cells

4. Nitrogen concentration is already more in the cells so it is not at all absorbed.

Q.

How are winds produced ?

Q. Which among the following statements are true regarding movement of air in costal regions?

1. During daytime, air from sea moves towards land due to the low pressure region formed in land.
2. During daytime, air from land moves towards sea due to the low pressure region formed in sea.
3. At night, the air above sea cools before that of the air above land.
4. At night, air above land cools down before that of the air above sea.

Q.

Why air is called "breath of life"?

Q. Which of the following is not a 'greenhouse gas'?
(a) Oxygen
(b) Carbon dioxide
(c) Chlorofluorocarbon
(d) Methane

Q.

The living component of the biosphere includes water, air, and soil.

1. True
2. False

Q.

A narrow zone formed by interaction among three spheres, namely, land, water, and air is called_________.

Q.

Ozonosphere occurs at height of:

1. 8-10 km above poles

2. 8-10 km above equator

3. 20-26 km above the earth surface

4. 11-16 km above equator

Q.

Set up an experiment to measure gain and loss of heat by water, sand and air.

Q.

There is no life on moon because of the absence of

1. water

2. oxygen

3. nitrogen

4. hydrogen

Q.

How does oxygen and carbon dioxide remain nearly constant in the atmosphere?

Q. “ The biosphere is dynamic but stable system.” Justify.

Q.

Question 2
If there were no atmosphere around the earth, the temperature of the earth will

(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected