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
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.
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
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.
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
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.
Q12
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
Q13
Which of the following organisms can respire anaerobically?
[A]. Amoeba
[B]. Yeast
[C]. Paramecium
[D]. Euglena
Q14
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.
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
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
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 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.
Q23
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.
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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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
