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

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

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
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

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

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
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

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

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
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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