Class 7 Science Chapter 10 MCQ

Class 7 Science Chapter 10 MCQ (Multiple Choice Questions) of Respiration in Organisms updated for academic session 2021-2022. All the objective questions are taken from the latest NCERT Textbooks issued for CBSE Session 2021-22.

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 2021-2022

Class: 7Science
Chapter: 10Respiration 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

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

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
Q9

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
Q10

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



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

Which of the following organisms can respire anaerobically?

[A]. Amoeba
[B]. Yeast
[C]. Paramecium
[D]. Euglena
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

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.
Q17

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
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 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

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
Q25

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

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