1. What is the composition of air?
1. What is the composition of air?
Answer:
Water vapour, oxygen, nitrogen, carbon dioxide, dust, and smoke are all components of air.
2. Which gas in the atmosphere is essential for respiration ?
2. Which gas in the atmosphere is essential for respiration ?
Answer:
The atmosphere's oxygen is necessary for respiration.
3. How will you prove that air supports burning?
3. How will you prove that air supports burning?
Answer:
Put two identical-length candles on a table. Activate the two candles. Put a glass tumbler on its side and place it over one of the candles. We can see that the candle that was covered by the glass tumbler eventually went out, but the other flame kept glowing. Because there isn't enough air within the glass tumbler to support burning, the candle burns out. The candle's consumption of the component consumes the majority of it. The other candle, on the other hand, is continuously receiving air. The name "oxygen" refers to this element of air that promotes combustion.
4. How will you show that air is dissolved in water?
4. How will you show that air is dissolved in water?
Answer:
Fill a container with water. Using a tripod stand, slowly warm it up. Examine the interior of the container before the water starts to boil. Within, we see little bubbles.These bubbles are a result of water containing dissolved air. The air that has been dissolved in the water escapes when it is first heated. The results of this experiment indicate that there is air in the water.
5. Why does a lump of cotton wool shrink in water?
5. Why does a lump of cotton wool shrink in water?
Answer:
In water, cotton wool lumps shrink because water replaces the air inside them, causing the layer to adhere to one another.
6. The layer of air around the earth is known as ___________.
6. The layer of air around the earth is known as ___________.
Answer:
The atmosphere is the term for the layer of air that surrounds the world.
7. The component of air used by green plants to make their food is ___________.
7. The component of air used by green plants to make their food is ___________.
Answer:
The component of air used by green plants to make their food is carbon dioxide.
8. List five activities that are possible due to the presence of air.
8. List five activities that are possible due to the presence of air.
Answer:
The following five activities are made possible by air:
Photosynthesis
Formation of clouds
Respirations
Transpiration
Winnowing
9. How do plants and animals help each other in the exchange of gases in the atmosphere?
9. How do plants and animals help each other in the exchange of gases in the atmosphere?
Answer:
Animals and plants use oxygen from the air for respiration, which also involves the emission of carbon dioxide gas into the atmosphere. In addition, during the process of photosynthesis, green plants also release oxygen gas by utilising carbon dioxide. Hence, in this way, the interchange of gases in the atmosphere is aided by the cooperation of plants and animals.
10. How will you show that air supports burning?
10. How will you show that air supports burning?
Answer:
Get a tiny lit candle. Put a glass jar over the candle that is burning. The candle goes out after a short while. Because the glass container restricts airflow, candle burning is also halted. This demonstration of air support for burning
11.How will you show that air is dissolved in water?
11.How will you show that air is dissolved in water?
Answer:
In a glass beaker or container, take some water. Using a tripod stand, slowly warm it up. Examine the interior of the pot thoroughly before the water starts to boil. Little bubbles can be seen inside. These bubbles are created when water that has air dissolved in it is heated.
12. Describe balance of oxygen in the air.
12. Describe balance of oxygen in the air.
Answer:
The species found in the air, water, soil, or anywhere else on earth use the oxygen in the air to breathe. Carbon dioxide gas is discharged into the atmosphere during respiration. Nevertheless, during photosynthesis, green plants consume airborne carbon dioxide to prepare food and release oxygen gas into the atmosphere. As a result, the air's oxygen balance is preserved.
15.What is the percentage of oxygen in air?
15.What is the percentage of oxygen in air?
Answer:
20.9%
16.What is the source of carbon dioxide in air?
16.What is the source of carbon dioxide in air?
Answer:
both plant and animal respiration and fuel combustion.
17. Mention two uses of air.
17. Mention two uses of air.
Answer:
(A) All living things require air for respiration.
(b) Air is necessary for the combustion of any substance.
18. What is air? Name the major constituents of air. Also give their volume proportions in air.
18. What is air? Name the major constituents of air. Also give their volume proportions in air.
Answer:
A variety of gases make up air. Air is primarily composed of nitrogen, oxygen, carbon dioxide, and argon. The following is the percentage breakdown of the components of air.
Water vapour and dust particles are some other air constituents
19. List five activities that are possible due to presence of air.
19. List five activities that are possible due to presence of air.
Answer:
Making a simple firki, making a weather cock, breathing to survive, burning things, and photosynthesis are all examples of simple tasks.
20. Mention one necessary condition for the combustion to take place.
20. Mention one necessary condition for the combustion to take place.
Answer:
Presence of air.
Also Read: Air Around Us Extra Questions and Answers
Also Read: Chapter 16: Garbage In Garbage Out
