We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 10 Respiration in Organisms with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Respiration in Organisms Class 7 MCQs Questions with Answers here along with a detailed explanation.
Respiration in Organisms Class 7 MCQs Questions with Answers
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: (b) tracheae
Question 16.
The most common substrate for respiration is
(a) fats
(b) amino acids
(c) glucose
(d) sucrose
Answer
Answer: (c) glucose
Question 17.
Organism which respires in the absences of oxygen is called a/an
(a) microbe
(b) anaerobe
(c) aerobic
(d) none of these
Answer
Answer: (b) anaerobe
Question 18.
During inspiration or inhalation, in lungs
(a) volume decreases, pressure increases
(b) volume increases, pressure decreases
(c) volume decreases, pressure decreases
(d) volume increases, pressure increases
Answer
Answer: (b) volume increases, pressure decreases
Question 19.
Insects have a special network of tubes called
(a) tracheae
(b) gills
(c) spiracles
(d) lungs
Answer
Answer: (a) tracheae
Question 20.
The major source of oxygen for the aquatic animals is
(a) atmosphere
(b) water
(c) soil
(d) none of these
Answer
Answer: (c) soil
Question 21.
Primary organ of human respiratory system is
(a) lung
(b) liver
(c) heart
(d) pharynx
Answer
Answer: (a) lung
Question 22.
When breakdown of glucose occurs in the presence of oxygen, the respiration is called
(a) anaerobic
(b) microbe
(c) aerobic
(d) none of these
Answer
Answer: (c) aerobic
Question 23.
The tracheal tubes have openings called
(a) trachea
(b) gills
(c) lungs
(d) spiracles
Answer
Answer: (d) spiracles
Question 24.
The process of breakdown of food in the cell with the release of energy is called
(a) cellular respiration
(b) aerobic respiration
(c) anaerobic respiration
(d) none of these
Answer
Answer: (a) cellular respiration
Question 25.
In earthworm, the exchange of gases occurs through
(a) lungs
(b) moist skin
(c) gills
(d) trachea
Answer
Answer: (b) moist skin
Question 26.
Plants breathe through tiny pores in the leaves called
(a) stomata
(b) leaf blade
(c) pores
(d) trachea
Answer
Answer: (a) stomata
Question 27.
Which of the following animals breathe through skin as well as through lungs?
(a) Fish
(b) Earthworm
(c) Cockroach
(d) Frog
Answer
Answer: (d) Frog
Fill in the blanks with suitable word/s.
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
Question 16.
In cockroaches, air enters the body through ……………………..
Answer
Answer: spiracles
Question 17.
During heavy exercise, we get cramps in the legs due to the accumulation of ……………………..
Answer
Answer: lactic acid
Question 18.
Normal range of breathing rate per minute in an average adult person at rest is …………………….. times per minute.
Answer
Answer: 15-18
Question 19.
During exhalation, the ribs move ……………………..
Answer
Answer: downwards
Question 20.
Breathing is a part of the process of ……………………..
Answer
Answer: respiration
Question 21.
…………………….. can respire through lungs as well as skin.
Answer
Answer: frogs
Question 22.
Plants respire through ……………………..
Answer
Answer: stomata
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
Question 16.
Air moves through windpipe into the nostrils.
Answer
Answer: False
Question 17.
Breathing rate varies depending on various factors.
Answer
Answer: True
Question 18.
Diaphragm is present on the floor of the chest cavity.
Answer
Answer: (c) Water
Question 19.
Yeas is an aerobic organism.
Answer
Answer: True
Question 20.
Wine and beer is made by alcoholic fermentation.
Answer
Answer: True
Question 21.
Lactic acid is produced in muscle cells.
Answer
Answer: True
Question 22.
Insects respire through lenticels.
Answer
Answer: False
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. Frog | (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. Frog | (g) Lungs, skin |
| Column A | Column B |
| 1. Stomata | (a) Physical process |
| 2. Yeast | (b) Plants |
| 3. Humans | (c) Anaerobe |
| 4. Breathing | (d) Biochemical process |
| 5. Respiration | e. Sandy-loam soil |
Answer
Answer:
| Column A | Column B |
| 1. Stomata | (b) Plants |
| 2. Yeast | (c) Anaerobe |
| 3. Humans | (e) Aerobes |
| 4. Breathing | (a) Physical process |
| 5. Respiration | (d) Biochemical process |
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