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

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

During exhalation, the ribs:

[A]. Move outward
[B]. Move downwards
[C]. Move upwards
[D]. Do not move at all
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

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

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

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

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

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

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

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

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.
Q22

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
Q23

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
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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