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Class 7 Science Chapter 10 MCQ

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

MCQ Tests with Answers for Class 7 Science Chapter 10

Pick the odd one out from the groups, given below on the basis of respiratory organs:

Fish is the odd one, as most fish breathe through their gills and do not have lungs.

The end products of respiration are:

The process of releasing energy from food is called respiration. Respiration occurs in all the living cells. The process of respiration involves taking in oxygen into the cells, using it for releasing energy by burning food, and then eliminating the waste products carbon dioxide and water from the body.

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.

It is not only the human beings who need energy but also all the other animals and plants also require energy.

Read the following sentences carefully, and choose the correct one:

[C]. The process of respiration involves taking in oxygen into the cells using it and then eliminating the waste products from the body.

Here, all these statements are correct. Hence, your answer will be option [D]

Consider the following statements and choose the incorrect one(s):

Cockroaches breathe with the help of air tubes called “tracheae”. 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.

Normal range of breathing rate per minute in an average adult person at rest is:

The number of times a person breathes in one minute is called breathing rate. The average breathing rate in an adult human being at rest is 15 to 18 times per minute. During running, the breathing rate of an adult human being can increase up to 25 per minute or even more.

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:

[B]. Those organisms which obtain energy by the process of anaerobic respiration without using oxygen are called anaerobes.

The breakdown of food like glucose to release energy can occur in the presence of oxygen as well as in the absence of oxygen. Based on these, there are two types of respiration as aerobic respiration and anaerobic respiration.

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?

[B]. The process of respiration which release energy from food take place inside the cells of the body it is called cellular respiration.

Here, all these statements are correct. Hence, your answer will be option [D]

Earthworms and frogs breathe through their skin because of which the skin of both the organisms is:

Earthworms and frogs have moist and slimy skin that helps them to absorb the oxygen for respiration.

During heavy exercise, we get cramps in the legs due to the accumulation of:

The accumulation of lactic acid in the muscles causes muscle cramps. During running or heavy exercise, we get muscles cramps. Generally, muscle cramps mean a painful contraction of muscles are called cramps. During heavy exercise some of our muscles respire anaerobically. The anaerobic respiration by muscles bring about partial breakdown of glucose or food to form lactic acid. This lactic acid accumulates in the muscles and reason for pain.

The mountaineers carry oxygen with them because:

The amount of air available to the person is less than that available on the ground.

Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to:

Fish has special organs called gills that help it to use oxygen dissolved in water. Gills are projections of the skin that are well supplied with blood vessels for exchange of gases.

Which of the following organisms can respire anaerobically?

All the organisms which obtain energy by anaerobic respiration can live without the oxygen. Yeast is an organism which can live without oxygen of air because it obtains energy by the process of anaerobic respiration. Those organisms which obtain energy by the process of an aerobic respiration are called anaerobes. Yeast is an anaerobe. It can survive in the absence of oxygen and converts glucose into alcohol. Therefore, it used in wine industry to make alcohol.

In a science quiz competition, Payel are asked a question where she had to choose the statement which was/were incorrect?

[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.

The accumulation of lactic acid in the muscles causes muscle cramps. During running or heavy exercise, we get muscles cramps. Generally, muscle cramps mean a painful contraction of muscles are called cramps. During heavy exercise some of our muscles respire anaerobically. The anaerobic respiration by muscles bring about partial breakdown of glucose or food to form lactic acid. This lactic acid accumulates in the muscles and reason for pain.

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

Here, all these statements are correct told by Paheli. Hence, your answer will be option [D]

Class 7 Science Chapter 9 MCQ

Class 7 Science Chapter 9 MCQ (Multiple Choice Questions) of Soil. All the MCQ objective questions are given here with suitable answers and explanation of answers. Contents are updated for academic session 2022-2023. Important questions and MCQ collectively provide a perfect revision of the chapter for a standard 7 students. Practice here with MCQ to score good marks in exams and clear your doubts.

Class 7 Science Chapter 9 MCQ for 2022-2023

Class: 7 Science
Chapter: 9 Soil
Contents: MCQ Objective Questions with Answers

MCQ Tests with Answers for Class 7 Science Chapter 9

Read the following sentences carefully, and choose the correct one:

Here, all the statements are correct. Hence, your answer will be option [D].

Consider the following statements and choose the incorrect one:

Soil is one of the most important natural resources. Soil supports for growth of plants and trees by holding their roots firmly and by supplying them with water and nutrients. Hence, soil is used to grow all types of plants not only for cotton plants.

Priya is writing some statements, choose the incorrect statement and help her:

[B]. Humus contains nutrients like nitrogen and phosphorus, which are needed by the plant for their growth.

Weathering of rocks is a very, very slow process. The process by which huge rocks are broken down into small particles by the action of sun’s heat, wind, rain and flowing river water etc., is called weathering. It takes thousands of years weather huge rocks or break down huge rocks into fine particles fit to make soil.