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NCERT Solutions for class 5 EVS Blow Hot, Blow Cold

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Exercises

I. Tick the correct option:

1. This gas is harmful to our body.

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

Ans: Carbon dioxide

2. It is a muscular organ which keeps pumping blood.

  1. Heart
  2. Stomach
  3. Lungs
  4. Brain

Ans: Heart

3. Our normal body temperature is ____________

  1. 97.4 F
  2. 98.4 F
  3. 99.4 F
  4. None of these

Ans: 98.4 F

4. Our heart beats ___________ times in minute.

  1. 52
  2. 62
  3. 72
  4. 82

Ans: 72

5. The air we breatehe becomes warm in our nose. It goes through the windpipe into a pair of bag-like structures located in our chest called _________

  1. Lungs
  2. Heart
  3. Mouth
  4. Head

Ans: Lungs

II. Give reasons for the following:

1. We should not cover our face while sleeping.

Ans: We should not cover our face while sleeping because over time it will become difficult for us to breathe.

2. Do not try to hold your breath.

Ans: We feel suffocated because our body runs out of oxygen and hence we should not try to hold our breath.

3. Deep breathing exercises are good for health

Ans: Deep breathing exercises are good for health because increases our lungs capacity and provides sufficient oxygen to our body organs.

4. We blow on hot soup to cool it.

Ans: We blow on hot soup to cool it so that it won’t burn our tongue.

5. We blow on our spectacles before cleaning them.

Ans: When we blow on spectacles its surface becomes cloudy that helps in cleaning it easily.

III. What is the main function of the following:

1. Alveoli

Ans: Alveoli helps in exchange of gases.

2. Diaphragm

Ans: It moves our chest in and out every time we breath.

3. Stethoscope

Ans: It is a special instrument that doctors uses to measure the heartbeat of patients.

4. Hair in the nose

Ans: Hair in the nose work as a filter that traps dust particles.

IV. Answer the following questions

1. Describe the process of inhalation and exhalation.

Ans: When we breathe in air, the diaphragm moves donw and lungs expand with the inhaled air. This process is called inhalation.

When we breathe our, the diaphragm relaxes and moves up, pushing the air out of the lungs. This process is called exhalation.

2. Where does the exchange of gases take place? Why is the exchange of gases so important?

Ans: The exchange of gases takes place in Alveoli. The carbon dioxide produced in our body is harmful for hence it is important to exchange gases so that our body never runs out of oxygen.

3. How do the doctors check the heartbeat of a patient without a stethoscope?

Ans: Doctors can check the heartbeat of a patient without a stethoscope by touching his patient’s left hand wrist with his right hand.

4. How is our breath useful in other ways?

Ans: Our breath is useful in the following ways:

  1. We blow on hot things to cool them.
  2. We blow on our spectacles to clean them.
  3. We blow on our burning fingers to cool them.
  4. A person cooking on a chullah blow on the burning piece of wood to supply oxygen.

5. Explain respiration. Name the main organs of respiratory system?

Ans: The process of inhalation and exhalation is called respiration. The main organs of respiratory system are nose, windpipe, diaphragm, and lungs.

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