Chapter-wise MCQ Questions

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Question-1. Air exhaled:

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

Question-2. Air tubes in insect is called

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

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

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

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

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

Question-5. Chest cavity is surrounded by

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

Question-6. Cockroaches breathe by using an organ called

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

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

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

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

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

Question-9. During inhalation the ribs:

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

Question-10. Earthworms breathe through

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

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

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

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

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

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

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

Question-14. More energy is released in

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Question-23. The most common substrate for respiration is

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

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

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

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

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

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

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

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

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

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

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

Question-29. To which disease is smoking linked ?

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

Question-30. Which disease is linked to smoking ?

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

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

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

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

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

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

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

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

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

Question-35. Which statement is correct?

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

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

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



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