Chapter-wise MCQ Questions

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Question-1. Air exhaled:

  1. has less amount of carbon dioxide
  2. has no moisture
  3. has more amount of oxygen
  4. has moisture
Answer-1

Question-2. Air tubes in insect is called

  1. Tracheae
  2. Gills
  3. Air tube
  4. Air bladder
Answer-2

Question-3. An adult human being at rest breathes in and out for…..............times in a minute

  1. 50-60
  2. 15-18
  3. 20-25
  4. 10-15
Answer-3

Question-4. Breathing rate in human beings in normal condition is

  1. 22-25 times in a minute
  2. 12-15 times in a minute
  3. 15-18 times in a minute
  4. 18-22 times in a minute
Answer-4

Question-5. Chest cavity is surrounded by

  1. 25 ribs
  2. 12 pair of ribs
  3. 10 pair of ribs
  4. 11 pair of ribs
Answer-5

Question-6. Cockroaches breathe by using an organ called

  1. none of these
  2. nose
  3. tracheae
  4. both (a) and (b)
Answer-6

Question-7. During exhalation the size of the chest cavity

  1. Get out of the lungs
  2. Decreases
  3. Increases
  4. Remains the same
Answer-7

Question-8. During heavy exercise, we get cramps in the legs due to the accumulation of

  1. water
  2. Carbon dioxide
  3. Lactic acid
  4. Alcohol
Answer-8

Question-9. During inhalation the ribs:

  1. do not move at all
  2. move outwards
  3. move downwards
  4. move upwards
Answer-9

Question-10. Earthworms breathe through

  1. nose
  2. skin
  3. legs
  4. trachea
Answer-10

Question-11. Giving out of air rich in carbon dioxide is called

  1. Breathing
  2. Respiration
  3. Inhalation
  4. Exhalation
Answer-11

Question-12. In cockroaches, air enters the body through…..............

  1. Skin
  2. Lungs
  3. Gills
  4. Spiracles
Answer-12

Question-13. Lime water turns milky due to the presence of which of the following gases?

  1. Oxygen
  2. Carbon monoxide
  3. Carbon dioxide
  4. Nitrogen
Answer-13

Question-14. More energy is released in

  1. Aerobic respiration
  2. Breathing
  3. Fermentation
  4. Anaerobic respiration
Answer-14

Question-15. Muscular floor of the chest cavity is called

  1. Bronchus
  2. Rib cage
  3. Diaphragm
  4. Trachea
Answer-15

Question-16. Name the organ of the body in which the blood is oxygenated.

  1. Pancreas
  2. Heart
  3. Lungs
  4. Lever
Answer-16

Question-17. Name the organism that breathes through its lungs as well as its skin

  1. Earthworm
  2. Human being
  3. Frog
  4. Dog
Answer-17

Question-18. Name the organism which breathes through its skin

  1. Earthworm
  2. Cat
  3. Human beings
  4. Dog
Answer-18

Question-19. Name the term which means ?taking in of air rich in oxygen into the body?.

  1. Respiration
  2. Exhalation
  3. Inhalation
  4. Breathing
Answer-19

Question-20. Taking in air rich in oxygen into the body is called _________

  1. Breathing
  2. Respiration
  3. Inhalation
  4. Exhalation
Answer-20

Question-21. The air tubes that an insect has are useful for the exchange of

  1. No exchange
  2. Gases
  3. Liquids
  4. Solid s
Answer-21

Question-22. The end products of anaerobic respiration are:

  1. none of these
  2. ethyl alcohol
  3. carbon dioxide
  4. both (a) and (b)
Answer-22

Question-23. The most common substrate for respiration is

  1. sucrose
  2. fats
  3. amino acids
  4. glucose
Answer-23

Question-24. The muscles of legs can be relieved by:

  1. sleeping
  2. massaging
  3. running
  4. exercising
Answer-24

Question-25. The percentage of oxygen in inhaled air is:

  1. 21%
  2. 14.40%
  3. 4.40%
  4. 16.40%
Answer-25

Question-26. The process of breakdown of food in the cell is known as

  1. none of these
  2. breakdown process
  3. cellular respiration
  4. food breakdown
Answer-26

Question-27. The rate of exchange of gases in plants is not as fast as in:

  1. human beings
  2. animals
  3. insects
  4. birds
Answer-27

Question-28. The small openings in the body of a cockroach are called

  1. Pores
  2. Holes
  3. Spiracles
  4. Tracks
Answer-28

Question-29. To which disease is smoking linked ?

  1. Anaemia
  2. Appendicitis
  3. Cancer
  4. Fever
Answer-29

Question-30. Which disease is linked to smoking ?

  1. lung cancer
  2. malaria
  3. cholera
  4. typhoid
Answer-30

Question-31. Which Of The Following Is Most Likely To Have A Much Higher Breathing Rate?

  1. Fish
  2. Man
  3. Dog
  4. Sparrow
Answer-31

Question-32. Which of these are the organs of human respiratory system?

  1. All of these
  2. Trachea
  3. Bronchus
  4. Alveolus
Answer-32

Question-33. Which one of the following is an anaerobic organism ?

  1. dog
  2. yeast
  3. crow
  4. ant
Answer-33

Question-34. Which part of nose prevents the passage of smoke dust inside the body:

  1. none of these
  2. hair
  3. nosal cavity
  4. nostrils
Answer-34

Question-35. Which statement is correct?

  1. Exhaled air contains more carbon dioxide and less oxygen.
  2. Exhaled air contains more oxygen and less carbon dioxide.
  3. Exhaled air contains less oxygen and less carbon dioxide.
  4. Inhaled air contains equal amount of carbon dioxide and oxygen.
Answer-35

Question-36. Yeast is used in wine and beer industries because it respires.

  1. anaerobically producing CO2
  2. aerobically producing oxygen
  3. aerobically producing alcohol
  4. anaerobically producing alcohol
Answer-36



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