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Respiration in Organisms Class 7 MCQs Questions with Answers
I. Choose the correct option.
Question 1.
All organisms are made of small microscopic units which cannot be seen with the naked eyes, called
(a) animals
(b) cells
(c) tissues
(d) organs
Answer
Answer: (b) cells
Question 2.
Organisms get energy through
(a) food
(b) eating
(c) sleeping
(d) none of these
Answer
Answer: (a) food
Question 3.
Cellular respiration is carried out in the
(a) cells
(b) organs
(c) tissues
(d) muscles
Answer
Answer: (a) cells
Question 4.
The process of breakdown of food in the cell is known as
(a) breakdown process
(b) cellular respiration
(c) food breakdown
(d) none of these
Answer
Answer: (b) cellular respiration
Question 5.
An example of aerobes is
(a) cat
(b) dog
(c) human being
(d) all of these
Answer
Answer: (d) all of these
Question 6.
When breakdown of glucose occurs with the use of oxygen, it is called
(a) anaerobic respiration
(b) aerobic respiration
(c) regular respiration
(d) all of these
Answer
Answer: (b) aerobic respiration
Question 7.
Name the type of respiration which causes muscle cramps.
(a) Aerobic respiration
(b) Anaerobic respiration
(c) Both (a) and (b)
(d) None of these
Answer
Answer: (b) Anaerobic respiration
Question 8.
Name the term which means ‘taking in of air rich in oxygen into the body’.
(a) Exhalation
(b) Inhalation
(c) Breathing
(d) Respiration
Answer
Answer: (b) Inhalation
Question 9.
Which gas is given out during exhalation?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) All of these
Answer
Answer: (c) Carbon dioxide
Question 10.
The gills help the fish to
(a) take in oxygen from air
(b) take in oxygen dissolved in water
(c) absorb nutrients present in water
(d) release waste substance in water
Answer
Answer: (b) take in oxygen dissolved in water
Question 11.
Yeast are used to make
(a) curd
(b) wine and beer
(c) bakery items
(d) both (b) and (c)
Answer
Answer: (d) both (b) and (c)
Question 12.
Earthworms breathe through
(a) skin
(b) legs
(c) trachea
(d) nose
Answer
Answer: (a) skin
Question 13.
The organ through which fishes breathe is
(a) nose
(b) gills
(c) skin
(d) spiracles
Answer
Answer: (b) gills
Question 14.
In the cells, oxygen is used to break down glucose into
(a) carbon dioxide, water and energy
(b) fats
(c) alcohol, carbon dioxide and energy
(d) lactic acid, water and energy
Answer
Answer: (a) carbon dioxide, water and energy
Question 15.
Cockroaches breathe by using an organ called
(a) nose
(b) tracheae
(c) both (a) and (b)
(d) none of these
Answer
Answer: (d) none of these
II. Fill in the Blanks
Question 1.
A person breathes ………………. while running.
Answer
Answer: faster
Question 2.
Windpipe is also known as ……………….
Answer
Answer: trachea
Question 3.
At the end of the bronchioles, small rounded structures called air sac or ………………. are present.
Answer
Answer: alveoli
Question 4.
The process of breakdown of food in the cell with the release of energy is called ……………….
Answer
Answer: cellular respiration
Question 5.
Organisms which can survive in the absence of air are known as ……………….
Answer
Answer: anaerobes
Question 6.
………………. is a single-celled organism used to make beer and wine.
Answer
Answer: Yeast
Question 7.
The partial breakdown of glucose produces ………………. acid in humans.
Answer
Answer: lactic
Question 8.
Inhalation means taking in of air rich in ……………….
Answer
Answer: oxygen
Question 9.
Exhalation means giving out of air rich in ……………….
Answer
Answer: carbon dioxide
Question 10.
The process of breathing is not always ……………….
Answer
Answer: constant
Question 11.
Lungs are present in the ……………….
Answer
Answer: chest cavity
Question 12.
………………. forms the floor of the chest cavity.
Answer
Answer: Diaphragm
Question 13.
While breathing, the movement of ………………. and ………………. takes place.
Answer
Answer: diaphragm, ribs
Question 14.
Either of the two openings on the sides of the body of insects is called ……………….
Answer
Answer: spiracle
Question 15.
………………. are present in the body of a fish for breathing.
Answer
Answer: Gills
III. True or False
Question 1.
Intense physical exercise slows down the breathing rate.
Answer
Answer: False
Question 2.
Breathing is a part of respiration.
Answer
Answer: True
Question 3.
Oxygen breaks down glucose outside the cell of organisms.
Answer
Answer: False
Question 4.
Exhaled air contains more percentage of carbon dioxide than inhaled air.
Answer
Answer: True
Question 5.
From lungs, oxygen is transferred to different parts of the body through blood in human beings.
Answer
Answer: True
Question 6.
During exercise, muscle cells respire aerobically to form lactic acid.
Answer
Answer: False
Question 7.
Cellular respiration takes place only in the cells of mammals.
Answer
Answer: False
Question 8.
Anaerobic respiration takes place without oxygen.
Answer
Answer: True
Question 9.
Hot water bath or massage improves circulation of blood.
Answer
Answer: True
Question 10.
Amoeba is used for making alcoholic drinks.
Answer
Answer: False
Question 11.
When there is a deficiency of oxygen in the muscle cells of our body, they start to go through anaerobic respiration permanently.
Answer
Answer: True
Question 12.
Lactic acid is produced when there is a partial breakdown of glucose.
Answer
Answer: True
Question 13.
The breathing rate of a person is always constant.
Answer
Answer: False
Question 14.
Smoking is injurious to our health.
Answer
Answer: True
Question 15.
Breathing causes movements in the ribs and the diaphragm.
Answer
Answer: True
IV. Match the Following
| Column I | Column II |
| 1. Physical activity | (a) Gills |
| 2. Yeast | (b) Tracheae |
| 3. Fish | (c) Increases breathing rate |
| 4. Cockroach | (d) Stomata |
| 5. Earthworm | (e) Preparation of alcoholic drinks |
| 6. Leaves | (f) Skin |
| 7. Amoeba | (g) Lungs, skin |
| 8. Mammals | (h) Cramps |
| 9. Lactic acid | (i) Lungs |
| 10. Air contracts | (j) Diffusion |
Answer
Answer:
| Column I | Column II |
| 1. Physical activity | (c) Increases breathing rate |
| 2. Yeast | (e) Preparation of alcoholic drinks |
| 3. Fish | (a) Gills |
| 4. Cockroach | (b) Tracheae |
| 5. Earthworm | (f) Skin |
| 6. Leaves | (d) Stomata |
| 7. Amoeba | (j) Diffusion |
| 8. Mammals | (i) Lungs |
| 9. Lactic acid | (h) Cramps |
| 10. Air contracts | (g) Lungs, skin |
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