Class 7 Science Chapter 6 MCQ (Multiple Choice Questions) of Respiration in Organisms updated for academic session 2023-24. All the objective questions are taken from the latest NCERT Textbooks issued for CBSE Session 2023-24. Get the complete revision using these important mcq objective questions with answers. The explanation of each answer is also given below each question.

Class 7 Science Chapter 6 MCQ for 2023-24

Class: 7Science
Chapter: 10Respiration in Organisms
Contents:MCQ Objective Online Test

MCQ Tests with Answers for Class 7 Science Chapter 10

Q1

The end products of respiration are:

[A]. CO₂ and energy
[B]. CO₂ and water
[C]. CO₂ and oxygen
[D]. CO₂, water, and energy
Q2

Read the following sentences carefully, and choose the correct one:

[A]. The process of releasing energy from food is called respiration.
[B]. All the organisms require energy for performing various activities and maintaining their life.
[C]. The process of respiration involves taking in oxygen into the cells using it and then eliminating the waste products from the body.
[D]. All the above.
Q3

Consider the following statements and choose the incorrect one(s):

[A]. Cockroaches breathe with the help of air tubes called spiracles.
[B]. Exchange of gases in the leaves take place with the help of stomata.
[C]. Diaphragm forms the floor of the chest cavity.
[D]. The roots of a plant take up oxygen from the air trapped between the soil particles.
Q4

Bikash is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. When the breakdown of glucose or food occurs without the use of oxygen, it is called an aerobic respiration.
[B]. When the breakdown of glucose or food occurs with the use of oxygen, it is called aerobic respiration.
[C]. Only a few living organisms carry out anaerobic respiration to obtain energy without using oxygen of air.
[D]. All the above
Q5

During inhalation, the diaphragm moves:

[A]. Moves downwards
[B]. Moves upwards
[C]. Moves towards left
[D]. Moves towards right
Q6

Which of the following is most likely to have a much higher breathing rate?

[A]. Man
[B]. Dog
[C]. Sparrow
[D]. Fish
Q7

Normal range of breathing rate per minute in an average adult person at rest is:

[A]. 9 – 12
[B]. 15 – 18
[C]. 21 – 24
[D]. 30 – 33
Q8

Badal appeared in class test but he confused to know the incorrect statement. Would you help him to know that?

[A]. Respiration is a kind of slow burning or slow combustion of food at ordinary temperature to produce energy.
[B]. The process of respiration is the similar process as of photosynthesis.
[C]. The process of breakdown of food in the cells of the body with the release of energy is called respiration.
[D]. None of the above
Q9

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. All the organisms which obtain energy by anaerobic respiration can live without oxygen.
[B]. The process of respiration which release energy from food take place inside the cells of the body it is called cellular respiration.
[C]. All the organisms which obtain energy by aerobic respiration cannot live without oxygen.
[D]. All the above.
Q10

Earthworms and frogs breathe through their skin because of which the skin of both the organisms is:

[A]. Moist and rough
[B]. Dry and rough
[C]. Dry and slimy
[D]. Moist and slimy
Q11

Consider the following statements and choose the incorrect one:

[A]. During heavy physical exercise or any other hard work, most of the energy is produced by aerobic respiration.
[B]. Anaerobic respiration does not take place only in the muscles of human beings, it also takes place in the muscles of other animals.
[C]. When extra energy is needed, anaerobic respiration can take place in our muscles for a long time.
[D]. We can live without food and water for many days but we cannot live for more than a few minutes without air.
Q12

The mountaineers carry oxygen with them because:

[A]. At an altitude of more than 5 km there is no air.
[B]. The amount of air available to the person is less than that available on the ground.
[C]. The temperature of air is higher than that on the ground.
[D]. The pressure of air is higher than that on the ground.
Q13

Fish breathe with the help of gills which are richly supplied with blood vessels. 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]. Reduce waste substance in water
Q14

Which of the following organisms can respire anaerobically?

[A]. Amoeba
[B]. Yeast
[C]. Paramecium
[D]. Euglena
Q15

Boojho wants to know the difference between aerobic and anaerobic respiration. Paheli told him, as she learnt in the class. Choose the incorrect statement told by her:

[A]. Complete breakdown of food occurs in aerobic respiration whereas partial breakdown of food occurs in anaerobic respiration.
[B]. The end products in anaerobic respiration are carbon dioxide and water whereas the end products in anaerobic respiration may be alcohol and carbon dioxide or lactic acid.
[C]. Aerobic respiration produces a considerable amount of energy whereas much less energy is produced in anaerobic respiration
[D]. None of the above
Q16

Choose the correct combinations of functions of breathing:

[A]. Provides O2 to the body and breaks down food to release energy
[B]. Breaks down food to release energy and helps the body to get rid of CO2
[C]. Provides O2 to the body and helps the body to get rid of CO2
[D]. Breaks down food to release energy and produces water in the cells
Q17

Priya is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Priya wants to take help from you:

[A]. The number of times a person breathes in one minute is called breathing rate.
[B]. The average breathing rate in an adult human being at rest is 15 to 18 times per minute.
[C]. During running, the breathing rate of an adult human being can increase up to 25 per minute or even more.
[D]. The breathing rate of a person decreases when he does gym or weightlifting.
Q18

Which of the following statement is or are correct?

[A]. Children breathe about 20 to 30 times per minute.
[B]. Whenever a person needs extra energy, he breathes faster than usual.
[C]. We feel hungry after doing a heavy physical exercise or activity.
[D]. All the above.
Q19

Priya is writing some statements, choose the correct statement and help her:

[A]. The taking in of air rich in oxygen into the body is called inhalation.
[B]. The giving out of air rich in carbon dioxide is called exhalations.
[C]. During anaerobic respiration, yeast produces alcohol resulting in sour smell.
[D]. All the above
Q20

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. Smoking cause heart diseases.
[B]. Smoking causes lung cancer.
[C]. A person who can inhale the air containing tobacco have no health issues.
[D]. None of the above
Q21

Read the following sentences carefully, and choose the correct one:

[A]. We often sneeze when we inhale air containing dust, smoke or pollen etc.
[B]. Yawning is caused by insufficient oxygen in the body.
[C]. The blood carries oxygen to the all parts of the body, this oxygen is carried by a red pigment called hemoglobin present in the red blood cells.
[D]. All the above
Q22

In a science quiz competition, Payel are asked a question where she had to choose the statement which was/were incorrect?

[A]. Dolphin and whales come to the surface of sea water from time to time to breathe in air.
[B]. We cannot survive under water because we have no use to make use of oxygen dissolved in water for breathing.
[C]. Frog is an animal which can breathe through lungs as well as its moist skin.
[D]. Insects have very little haemoglobin, present in their blood to carry out oxygen.
Q23

Which of the following statement is or are incorrect?

[A]. All the insects have tiny holes on the sides of their body which are called spiracles.
[B]. The breathing in all the insects take place through tiny holes and thin air tube called trachea.
[C]. Cockroach has spiracles on the sides of its body and trachea or air tube throughout inside its body for the process of breathing and respiration.
[D]. None of the above
Q24

Boojho is doing his homework which is given by his teacher. Would you help him to choose the correct sentences?

[A]. Plants carry of photosynthesis only during the daytime.
[B]. The roots of a plant take of air from the spaces between the soil particles.
[C]. The exchange of gases in the leaves during respiration takes place through stomata.
[D]. All the above
Q25

Sometimes when we do heavy exercise, anaerobic respiration take place in our muscles cells. What is produced during this process?

[A]. Alcohol and lactic acid
[B]. Alcohol and CO2
[C]. Lactic acid and CO2
[D]. Lactic acid only

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Last Edited: June 13, 2023