Updated on June 13, 2023
by Tiwari Academy
by Tiwari Academy
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: 7 | Science |
| Chapter: 10 | Respiration 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
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.
Q3
During exhalation, the ribs:
[A]. Move outward
[B]. Move downwards
[C]. Move upwards
[D]. Do not move at all
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
Payel is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Payel wants to take help from you:
[A]. Oxygen breaks down glucose outside the cell of organisms.
[B]. Insects have spiracles on the lower surface of the body
[C]. Exhaled air has more percentage of CO2 than inhaled air.
[D]. None of the above
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
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
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
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.
Q14
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
Q15
Read the following sentences carefully, and choose the correct one:
[A]. A breath means one inhalation plus one exhalation.
[B]. The taking in of air rich in oxygen into the body during breathing is called inhalation.
[C]. The ordinary air which we take into the lungs is rich in oxygen but the air expelled from the lungs is rich in carbon dioxide.
[D]. All 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
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.
Q18
Consider the following statements and choose the incorrect one:
[A]. The breathing is a chemical process.
[B]. The air tubes of insect open to exterior by spiracles.
[C]. Windpipe in humans is called trachea.
[D]. Yeast can respire in absence of oxygen and it is known as anaerobic respiration.
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
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
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, 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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Help and Support
Get the help from the NCERT Solutions given at the end of chapter exercise and important questions to prepare for your exams. Now a days MCQ is also a part of question papers in all standard. All the possible MCQs objective questions are given here to help the students in exams. We have tried to cover entire chapter in terms of multiple choice question answers.
Last Edited: June 13, 2023
