Tag: biology

Questions Related to biology

Which one of the following is not a function of air?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Combustion

  2. To fill the balloons and air strip

  3. Respiration

  4. Pollination of plants

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Correct Option: B
Explanation:
Air is a mixture of different types of gases, dust particles, water vapours, etc.
The important components of air are nitrogen, oxygen, argon, carbon dioxide, etc,
Air is a very important component of the earth because of the following reasons
  1. It provides us fresh oxygen for respiration process
  2. It supports the water cycle
  3. It facilitates pollination in plants
  4. Conduct sound and help in the transmission
  5. It helps in the combustion process.

Which one is NOT applicable for combustion and respiration processes?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Both are chemical processes

  2. Energy change take place in both

  3. Oxygen gas is consumed

  4. Both processes are fast

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Correct Option: D
Explanation:

Cellular respiration resembles ordinary combustion or burning, in the break down of chemical bonds, use of oxygen, production of carbon dioxide and release of energy, but there are fundamental differences between the two processes.

Combustion releases a large amount of energy in a single step and most of it changes in to heat and some at times in to light and raising the temperature greatly. Cellular respiration releases energy in steps and each energy releasing step is coupled with the synthesis of ATP. Only a small amount of energy dissipates as heat. Respiration may be called as slow burning.

Which of the following is true for burning?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Releases heat and ATP

  2. Mass of products remains the same

  3. It is a fast process

  4. All of above

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Correct Option: D

In respiration carbon and oxygen in _____ are oxidised.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Organic matter

  2. Inorganic matter

  3. Aliphatic carbon

  4. None of above

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Correct Option: A
Explanation:

In respiration oxygen breakdowns food substances mainly glucose and release energy in the form of heat. The carbon and oxygen that are oxidised are present in organic matter. Whereas in burning carbon and oxygen in inorganic matter is oxidized.

_____ and ______ are produced and released in exhaled air.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. $CO _2$ and $H _2$

  2. $H _2O$ and $H _2$

  3. $CO _2$ and water vapour

  4. None of the above

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Correct Option: C
Explanation:

Respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. The oxygen from air oxidises food substances mainly glucose in their body cells and release energy in the form of heat.

$C _6H _{12}O _6 + 6O _2 \longrightarrow$

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. $CO _2$

  2. $H _2O$

  3. Heat

  4. All of above

Show answer
Correct Option: D
Explanation:

In respiration, oxygen breakdowns food substances mainly glucose and release energy in the form of heat. Also, it gives out carbon dioxide and water vapour.

$C _6H _12O _6+6O _2\rightarrow6CO _2+6H _2O$

Respiration requires ___ temperatures whereas burning requires __ temperature.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Room temperature, high temperature

  2. Low temperature, high temperature

  3. $37^oC$, high temperature

  4. $37^oC$, low temperature

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Correct Option: C
Explanation:

Respiration is a slow process occurring inside the living systems only. Hence, it requires body temperature i.e., $37^0C$ to occur. Whereas burning occurs outside the living system. It requires a high temperature to initiate a chemical change.


Hence, option $C$ is correct.

Which of the following is the most heterogeneous mixture?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Brass

  2. Gasoline

  3. Distilled water

  4. A Pizza

  5. Air

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Correct Option: D
Explanation:

A Pizza is the most heterogeneous mixture.
In a heterogeneous mixture the composition formed due to the mixing of components is not entirely uniform like in the case of grains mixed with dust etc.

Air is an example of homogeneous mixture.

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. True

  2. False

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Correct Option: A
Explanation:
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. 
If we consider some region of air, the gases, their volumes present in one part of the region equal to another one part of same region. We aren't able to divide different gases present in air. 
The statement is true.

A student finds that as he blows air into a balloon, it becomes bigger. What inference can he make from the above?

biology physical resources air as a natural resource types of chemical reactions chemical reactions

  1. Air is a gas

  2. Air has mass

  3. Air is matter

  4. Air occupies space

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Correct Option: A
Explanation:

When a balloon is filled with air then the air exerts force on the walls of the balloon. Due to this force the balloon material stretches and hence size of balloon increases. The material of the balloon is such that it can stretch a lot.