Class 7 Science Chapter 6 MCQ (Multiple Choice Questions) of Respiration in Organisms updated for academic session 2025-26. All the objective questions are taken from the latest NCERT Textbooks issued for CBSE Session 2025-26. 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 2025-26

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

MCQ Tests with Answers for Class 7 Science Chapter 10

Q1

Pick the odd one out from the groups, given below on the basis of respiratory organs:

[A]. Cockroach, grasshopper, ant
[B]. Lizard, cow, snake
[C]. Crocodile, dolphin, fish
[D]. Snake, crow, goat
Q2

The end products of respiration are:

[A]. CO₂ and energy
[B]. CO₂ and water
[C]. CO₂ and oxygen
[D]. CO₂, water, and energy
Q3

Which of the following statement is or are incorrect?

[A]. The stored energy of food is released slowly during the process of respiration which takes place inside our body.
[B]. Respiration is essential because it provides us energy from the food which we eat and digest
[C]. It is only the human beings who need energy.
[D]. None of the above.
Q4

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.
Q5

During inhalation, the diaphragm moves:

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

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
Q7

Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. Most of the living organisms carry out aerobic respiration by using oxygen of air.
[B]. Those organisms which obtain energy by the process of anaerobic respiration without using oxygen are called anaerobes.
[C]. The breakdown of food like glucose to release energy can occur in the presence of oxygen.
[D]. None of the above.
Q8

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.
Q9

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
Q10

During heavy exercise, we get cramps in the legs due to the accumulation of:

[A]. Carbon dioxide
[B]. Lactic acid
[C]. Alcohol
[D]. Water
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

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

[A]. The size of the chest cavity increases during inhalation.
[B]. The fishes have lungs for respiration.
[C]. Frogs breathe through their skin as well as their lungs.
[D]. Plants carry out photosynthesis only during the daytime when sunlight is available.
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

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
Q19

During the process of exhalation, the ribs move

[A]. Down and inwards
[B]. Up and inwards
[C]. Down and outwards
[D]. Up and outwards
Q20

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

[A]. The air which we inhale contains a higher proportion of oxygen.
[B]. The air which we inhale contains a lower proportion of carbon dioxide.
[C]. The air which we inhale contains only a little of water vapour.
[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

Yeast is used in wine and beer industries because it respires:

[A]. Aerobically producing oxygen
[B]. Aerobically producing alcohol
[C]. Anaerobically producing alcohol
[D]. Anaerobically producing CO2
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, has taken three test tubes with half-filled water and kept some organisms. But he wants to know which tube has highest concentration of Carbo dioxide?

[A]. Snail, in A test tube
[B]. Plant, in B test tube
[C]. Snail and plant, in C test tube
[D]. None of 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