Respiration in Plants and Animals

Q.

What happen to lime water when exhaled air is passed through it?

Q. Which of the choices can best fill in the boxes I and II given below?

1. I - Oxygen, II - Respiration
2. I - Carbon dioxide, II - Oxygen
3. I - Respiration, II - Carbon dioxide
4. I - Respiration, II - Oxygen

Q.

The gas present in the atmosphere which is essential for respiration is:

1. Hydrogen
2. Oxygen
3. Carbon dioxide
4. Nitrogen

Q.

The proportion of oxygen and carbon dioxide in the atmosphere is maintained by _______.

1. only plants

2. only animals

3. both plants and animals

4. only plants but not animals

Q. Plants take in oxygen and give out carbon dioxide during respiration.

1. True
2. False

Q. Human beings breathe in oxygen.

1. True
2. False

Q. Human beings breathe out carbon dioxide.

1. False
2. True

Q. Animals don't need oxygen for respiration.

1. True
2. False

Q.

The lack of which of the following constituents of air forces us to gasp and struggle to breathe?

1. Nitrogen

2. Oxygen

3. Carbon dioxide

4. Water vapour

Q. The gas which is necessary for respiration is ______.

1. sulphur dioxide
2. oxygen
3. hydrogen
4. nitrogen

Q. During respiration plants absorb________.

1. hydrogen
2. oxygen
3. carbon dioxide
4. nitrogen