Respiration in Organisms MCQ Questions for Class 7 Science Chapter 10 with Answers

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 7 Science book Chapter 10 Respiration in Organisms with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 7 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Respiration in Organisms. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 7 free Pdf and prepare to exam and help students understand the concept very well.

MCQ Questions for Class 7 Science with Answers

Q1. We feel hungry after a physical activity because we need:

(i) oxygen
(ii) energy
(iii) food
(iv) none of these

(ii) energy

Q2. Lime water turns milky due to the presence of which of the following gases?

(i) Carbon monoxide
(ii) Carbon dioxide
(iii) Nitrogen
(iv) Oxygen

(ii) Carbon dioxide

Q3. Name the organ of the body in which the blood is oxygenated.

(i) Heart
(ii) Lungs
(iii) Lever
(iv) Pancreas

(ii) Lungs

Q4. Taking in air rich in oxygen into the body is called _

(i) Respiration
(ii) Inhalation
(iii) Exhalation
(iv) Breathing

(iii) Exhalation

Q5. The process of breakdown of food in the cell is known as

(i) breakdown process
(ii) cellular respiration
(iii) food breakdown
(iv) none of these

(ii) cellular respiration

Q6. The vital biological process of organisms is:

(i) inspiration
(ii) respiration
(iii) transpiration
(iv) evaporation

(ii) respiration

Q7. Oxidation of food inside cell takes place in

(i) Golgi bodies
(ii) Mitochondria
(iii) Chromosome
(iv) Ribosome

(ii) Mitochondria

Q8. Yeasts are used in

(i) wine and beer industry
(ii) bakery
(iii) in both
(iv) none of these

(i) wine and beer industry

Q9. During exhalation the size of the chest cavity __

(i) Decreases
(ii) Increases
(iii) Remains the same
(iv) Get out of the lungs

(i) Decreases

Q10. When breakdown of glucose occurs with the use of oxygen, it is called

(i) anaerobic respiration
(ii) aerobic respiration
(iii) regular respiration
(iv) all of these

(ii) aerobic respiration

Q11. The percentage of oxygen in inhaled air is:

(i) 14.4%
(ii) 4.4%
(iii) 16.4%
(iv) 21%

(iv) 21%

Q12. Voice box is present in

(i) Pharynx
(ii) Epiglottis
(iii) Mouth
(iv) Larynx

(iv) Larynx

Q13. Breathing rate in human beings in normal condition is

(i) 12-15 times in a minute
(ii) 15-18 times in a minute
(iii) 18-22 times in a minute
(iv) 22-25 times in a minute

(ii) 15-18 times in a minute

Q14. The small openings in the body of a cockroach are called

(i) Holes
(ii) Spiracles
(iii) Tracks
(iv) Pores

(ii) Spiracles

Q15. Name the term which means ‘taking in of air rich in oxygen into the body’.

(i) Exhalation
(ii) Inhalation
(iii) Breathing
(iv) Respiration

(ii) Inhalation

Q16. The process of respiration leads to the release of energy in:

(i) plants
(ii) animals
(iii) human beings
(iv) all of these

(i) plants

Q17. Muscular floor of the chest cavity is called

(i) Rib cage
(ii) Diaphragm
(iii) Trachea
(iv) Bronchus

(ii) Diaphragm

Q18. In cockroaches, air enters the body through __

(i) Lungs
(ii) Gills
(iii) Spiracles
(iv) Skin

(iii) Spiracles

Q19. Yeast are used to make

(i) curd
(ii) wine and beer
(iii) bakery items
(iv) both (ii) and (iii)

(iv) both (ii) and (iii)

Q20. The respiratory organ of birds are:

(i) mouth
(ii) gills
(iii) wet skin
(iv) lungs

(iv) lungs

Q21. Stomata are surrounded by

(i) Pigmented cells
(ii) Accessories cells
(iii) Guard cells
(iv) Lenticels

(iii) Guard cells

Q22. Which Of The Following Is Most Likely To Have A Much Higher Breathing Rate?

(i) Man
(ii) Dog
(iii) Sparrow
(iv) Fish

(iv) Fish

Q23. In the cells, oxygen is used to break down glucose into

(i) carbon dioxide, water and energy
(ii) fats
(iii) alcohol, carbon dioxide and energy
(iv) lactic acid, water and energy

(i) carbon dioxide, water and energy

Q24. Air enters the lungs when:

(i) diaphragm is lowered
(ii) diaphragm is pushed upwards
(iii) diaphragm remains at its place
(iv) none of these

(i) diaphragm is lowered

Q25. The opening of the pharynx to larynx is guarded by

(i) Adam’s apple
(ii) Epiglottis
(iii) Alveoli
(iv) Trachea

(ii) Epiglottis

Q26. Which of these are the organs of human respiratory system?

(i) Trachea
(ii) Bronchus
(iii) Alveolus
(iv) All of these

(iv) All of these

Q27. The most common substrate for respiration is

(i) fats
(ii) amino acids
(iii) glucose
(iv) sucrose

(iii) glucose

Q28. If a potted plant is over watered, the roots will:

(i) grow
(ii) die
(iii) dry
(iv) none of these

(ii) die

Q29. Inhalation is the

(i) Release of oxygen
(ii) Intake of carbon dioxide
(iii) Intake of oxygen
(iv) Release of carbon dioxide

(iii) Intake of oxygen

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