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
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
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.
Q5
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
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
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
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.
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
Which of the following organisms can respire anaerobically?
[A]. Amoeba
[B]. Yeast
[C]. Paramecium
[D]. Euglena
Q14
In a science quiz competition, Payel are asked a question where she had to choose the statement which was/were incorrect?
[A]. The accumulation of acetic acid in the muscles causes muscle cramps.
[B]. After a heavy physical exercise or very fast running etc., we sometimes get muscle cramps.
[C]. We can get relief from cramps in muscles caused by heavy exercise by taking a hot water bath or a massage.
[D]. Anaerobic respiration take place in our muscles cells during any vigorous physical activity when oxygen gets used up faster in the muscle cells.
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
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.
Q18
During the process of exhalation, the ribs move
[A]. Down and inwards
[B]. Up and inwards
[C]. Down and outwards
[D]. Up and outwards
Q19
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.
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
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
[A]. The blood carrying oxygen called oxygenated blood.
[B]. The blood having no oxygen called deoxygenated blood.
[C]. Different people can expand their chest by different amounts.
[D]. The breathing rate in children is lower than that of adults.
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 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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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
