Updated by Tiwari Academy
on June 13, 2023, 10:57 AM
on June 13, 2023, 10:57 AM
Class 7 Science Chapter 6 MCQ (Multiple Choice Questions) of Respiration in Organisms updated for academic session 2024-25. All the objective questions are taken from the latest NCERT Textbooks issued for CBSE Session 2024-25. 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 2024-25
| 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
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.
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
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
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
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
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.
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
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.
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
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.
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
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
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, 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
