Breathing

Q.

Breathing is a process that

(i) provides O₂ to the body.

(ii) breaks down food to release energy.

(iii) helps the body to get rid of CO₂.

(iv) produces water in the cells.

Which of the following gives the correct combination of functions of breathing?

1. (a) (i) and (ii)

2. (ii) and (iii)

3. (i) and (iii)

4. (ii) and (iv)

Q.

The upper opening of the windpipe is guarded by a muscular flap called

1. Diaphragm

2. Tongue

3. Epiglottis

4. Cardiac sphincter

Q.

Breathing is also known as internal respiration.

1. False
2. True

Q.

The movement of air in and out of lungs is called __.

1. respiration

2. breathing

3. transpiration

4. None of the above.

Q.

Yeast cells convert glucose into ___.

Q. What chemical do you use to remove CO2 from inside a flask in certain experiments on photosynthesis?

Q.

Which of the following cell/organisms cannot perform aerobic respiration?

1. Rabbits

2. Fish

3. Bacteria

4. Virus

Q. To inhale …………. and to exhale ……………. is called respiration.

1. None of these
2. Nitrogen, Carbon-dioxide
3. Oxygen, Carbon-dioxide
4. Oxygen, Nitrogen

Q.

What Parts of the Respiratory System Comprises the Lower Respiratory Tract?

Q.

Which of the following gases that we breathe in is absorbed by the body?

1. Oxygen

2. Carbon dioxide

3. Nitrogen

4. Helium

Q. Given below is the definition of respiration with a few blanks to be filled in. Write suitable words in the blanks:

Respiration is a process of releasing __________ by breaking down __________ for carrying out __________ processes.

Q.

What is the function of the epiglottis?

1. To help in the gag reflex.

2. To help while vomiting.

3. To block dust particles from entering the wind-pipe.

4. To prevent food from entering the wind-pipe.

Q.

The process of breathing occurs outside the cells.

1. False

2. True

Q.

Breathing normally is an involuntary act.

1. True

2. False

Q. The entry of food into the windpipe is prevented by ________.

1. larynx
2. alveoli
3. pharynx
4. epiglottis

Q. Fermentation is a type of respiration.

1. anaerobic
2. natural
3. aerated
4. aerobic

Q.

The exchange of gases in human beings takes place in

1. in skin

2. in mouth

3. in nostrils

4. in lungs

Q.

Name the gaseous waste in plants.

Q. Earthworm respiration occurs by

1. Nose
2. ​​​​​​Gills
3. Skin
4. Lungs

Q.

The number of times a person breathes in one minute is called ________.

Q.

Whales can hold their breath for nearly 2 hours. By reasonable extrapolation, humans should be able to hold their breath for at least half an hour.

1. True

2. False

Q.

How long can healthy adults hold their breath?

1. 5 minutes

2. 2 Minutes

3. 24 minutes

4. 5 seconds

Q. In the alveoli, carbon dioxide from the inhaled air passes into the blood.

1. False
2. True

Q.

__________ is the key for generating energy in cellular respiration.

1. Nitrogen

2. Carbon dioxide

3. Water

4. Oxygen

Q. Which of the following organisms breathe through their skin?

1. Fish
2. Earthworm
3. Cockroach
4. Snake

Q.

Breathing is a process that
(i) Provides oxygen to the body.
(ii) Breaks down food to release energy.
(iii) Helps the body to get rid of carbon dioxide.
(iv) provides nitrogen to the body
Which of the following correctly defines the functions of breathing?

1. (ii) and (iii)

2. (i) and (iii)

3. (ii) and (iv)

4. (i) and (ii)

Q. External respiration refers to exchange of gases between

1. Inspired air and blood
2. Blood and tissue fluid
3. Alveolar air and tissue fluid
4. Environmental air and lungs

Q. Short / long answer type questions.
Write in brief the mechanism of respiration in mammals.

Q. Breakdown of glucose molecule into pyruvate takes place in which organelle?

1. Vacuole
2. Nucleus
3. Cytoplasm
4. Mitochondria

Q. Why do our body cells require oxygen?