Class 7 Science Chapter 10 MCQ (Multiple Choice Questions) of Respiration in Organisms updated for academic session 2022-2023. All the objective questions are taken from the latest NCERT Textbooks issued for CBSE Session 2022-23. 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 10 MCQ for 2022-2023

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

MCQ Tests with Answers for Class 7 Science Chapter 10

Q1

The end products of respiration are:

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

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

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

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

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

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.
Q19

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
Q20

During the process of exhalation, the ribs move

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