Respiration in Plants and Humans

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1. The process of releasing energy from food is called –

(a) Respiration

(b) Nutrition

(d) All of these

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2. In which form is energy produced in cells during respiration?

(a) ADP

(b) ATP

(d) In the form of heat

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3. Choose the correct statements:

1. Respiration is essential for life.
2. Viruses do not respire.
3. ATP is the form of energy used in cells.

All 3 are correct

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4. Which of the following is NOT true about respiration?

(a) The final stage of respiration occurs in mitochondria.

(b) Respiration provides energy for all biological processes.

(d) In respiration, energy is stored as glucose instead of ATP.

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5. What is the site of respiration?

(a) Ribosome

(b) Stomach

(d) None of these

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6. What is the end product of solar energy conversion to chemical energy in
photosynthesis, which is used in respiration?

(a) Amino acid

(b) Glucose

(d) ATP

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7. What is the universal carrier of chemical energy in all living cells?

(a) Glucose

(b) ATP

(d) Amino acid

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8. In which organelle is the majority of energy produced through cellular
respiration?

(a) Ribosome

(b) Amino acid

(d) Mitochondria

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9. Choose the correct statements:

1. Respiration begins in the cytoplasm and ends in mitochondria.
2. Mitochondria play a major role in aerobic respiration.
3. Anaerobic respiration only occurs in yeast and some bacteria.

(a) All 3

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10. Where does glycolysis occur?

(a) In ribosomes

(b) In mitochondria

(d) In vacuoles

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11. Where does the Krebs cycle take place?

(a) In ribosomes

(b) In vacuoles

(d) In mitochondria

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12. During anaerobic respiration, which products are formed in yeast due to
breakdown of glucose?

(a) H₂O and CO₂

(b) Alcohol and H₂O

(d) Alcohol and glucose

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13. In animals, anaerobic respiration in muscle cells produces which
products?

(a) Alcohol and CO₂

(b) Lactic acid and CO₂

(d) CO₂ and H₂O

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14. Choose the correct statements:
1. All cells require oxygen to produce energy.
2. Cells can produce energy even without oxygen.
Which statement(s) is/are correct?

(a) Only 1

(b) Only 2

(d) Neither 1 nor 2

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15. Which enzyme is responsible for breaking down carbohydrates like
glucose and starch into simpler sugars for energy?

(a) Maltase

(b) Amylase

(d) Translocase

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16. Which of the following statements about aerobic or anaerobic respiration
is NOT true?

(a) Aerobic respiration occurs in oxygen-rich environments.

(b) Anaerobic respiration occurs in some microorganisms.

(d) Anaerobic respiration occurs in oxygen-deficient conditions.

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17. Where does aerobic respiration take place?

(a) Glycolysis

(b) Krebs cycle

(d) None of these

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18. In absence of oxygen, what are the products in muscle cells and yeast
respectively?

(a) Ethyl alcohol

(b) Lactic acid

(d) Carbon dioxide

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20. What is the site of respiration?

(a) Mitochondria

(b) Cytoplasm

(d) All of these

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19. What is the final step of respiration in cells?

(a) Glucose

(b) Glycolysis

(d) Oxidation

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21. Choose the correct statement:

1. ATP is called bio-energy.

🧠 Explanation: ATP provides energy for all life processes and is called bio-energy.

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22. Why is glucose called the cellular fuel?

Which statements are correct?
1. It provides energy.
2. It helps in oxidation

Both 1 and 2 are correct

🧠 Explanation: Glucose provides energy and undergoes oxidation during respiration.

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23. What is the end product of glycolysis?

(a) Glucose

(b) Ethyl alcohol

(d) CO₂

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24. What are the products of the Krebs cycle?

(a) ATP

(b) CO₂ and H₂O

(d) Pyruvic acid

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25. What is another name for the Krebs cycle?

(a) Pyruvic acid cycle

(b) Citric acid cycle

(d) Oxidation cycle

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26. What is the end result of respiration?

(a) Anaerobic respiration

(b) Aerobic respiration

(d) Pyruvate formation

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27. Where does anaerobic respiration take place inside the cell?

(a) Endoplasmic Reticulum

(b) Cytoplasm

(d) Mitochondria

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28. How many ATP molecules are produced during aerobic respiration of one
glucose molecule?

(a) 2 ATP

(b) 36 ATP

(d) 46 ATP

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29. What is the cause of pain in muscles after intense physical activity?

(a) Excess glycogen

(b) Ethyl alcohol

(d) None of these

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30. Why do we get extra energy during digestion and respiration in the body?

(a) Fat is broken down.

(b) Oxygen levels increase in cells.

(d) All of these

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31. Which of the following statements is NOT true?

(a) In aerobic respiration, the process completes in two stages – Glycolysis and Krebs cycle.

(b) Anaerobic respiration is completed entirely in the cytoplasm.

(d) During anaerobic respiration, pyruvic acid does not form.

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32. What is produced during respiration in animals?

(a) Pyruvic acid and ATP

(b) Lactic acid and ATP

(d) Alcohol, CO₂, and ATP

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33. What is released during anaerobic respiration in yeast?

(a) Pyruvic acid and ATP

(b) Alcohol, CO₂, and ATP

(d) Only CO₂ and ATP

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34. In aerobic respiration, how many ATP molecules are produced from
complete oxidation of one glucose?

(a) 2

(b) 28

(d) 48

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35. What are the stages of external respiration?

(a) Inhalation

(b) Exhalation

(d) None of these

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36. Which parts of the plant perform respiration?

(a) Root

(b) Stem

(d) All of these

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37. Through which opening do plants take in atmospheric oxygen?

(a) Stomata

(b) Lenticels

(d) All of these

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39. Which of the following is NOT true?

(a) Respiration in animals is similar to plants.

(b) In both plants and animals, respiration starts with glucose.

(d) Respiration does not occur in the roots of plants.

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38. Exchange of gases in plants happens through—

(a) Stomata

(b) Lenticels

(d) All of these

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40. What gases are absorbed and released during respiration in plants?

(a) Oxygen – In, CO₂ – Out

(b) CO₂ – In, O₂ – Out

(d) Oxygen – In, Water – Out

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41. Why is oxygen important in respiration?

(a) Combustion

(b) Oxidation

(d) All of these

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42. Why don’t plants take in oxygen from the environment during daytime for
respiration?

(a) They don’t respire during the day.

(b) They take oxygen only at night.

(d) They do anaerobic respiration during the day.

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43. In which parts of plants are lenticels found?

(a) Leaves

(b) Roots

(d) All of these

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44. In cockroaches, how does exchange of gases occur?

(a) Through spiracles and tracheae

(b) Through blood vessels

(d) Not known

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45. Choose the correct statements:
1. Respiration in insects is through tracheae.
2. Insects exchange gases through spiracles.
3. Spiracles open and close with the help of muscles.

(d) All 1, 2, and 3

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46. Choose the correct statements:
1. Aquatic animals take oxygen from water using gills.
2. Terrestrial animals take oxygen from air.

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47. In which of the following, which organelle is used by unicellular organisms
(like Amoeba) for cellular respiration?

(a) Amoeba

(b) Ribosomes

(d) Lysosomes

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48. In Hydra and Leech, respiration is carried out by—

(a) Gills

(b) Skin

(d) Lungs

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49. Which structure absorbs oxygen during respiration in leech?

(a) Gills

(b) Skin

(d) All of these

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50. Which of the following is NOT true?

(a) Fishes and aquatic animals use gills for respiration.

(b) Gills help extract dissolved oxygen from water.

(d) Gills cannot be used for respiration in land-dwelling animals.

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51. Which of the following structures help lungs in respiration?

(a) Diaphragm

(b) Rib muscles

(d) All of these

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52. Which of the following shows the correct sequence of the human
respiratory system?

(a) Nostrils → Pharynx → Larynx → Trachea → Lungs

(b) Nostrils → Larynx → Pharynx → Trachea → Lungs

(d) Nostrils → Trachea → Larynx → Pharynx → Lungs

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53. Why do humans sneeze when entering a dusty place or pollution zone?

(a) Dust irritates the nasal passage.

(b) Nasal cavity has a sensitive mucous lining.

(d) Nasal chamber is small.

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54. Choose the correct statement(s):
1. Human respiration starts with nasal opening.
2. Respiration ends in lungs or alveoli.

(a) Only 1

(b) Only 2

(d) Neither 1 nor 2

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55. The small region of the nasal chamber which opens to the outside is
called—

(a) Vestibule

(b) Olfactory region

(d) Respiratory region

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56. What helps to detect smell and taste from inhaled air?

(a) Nasal septum

(b) Olfactory region

(d) Trachea

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57. What is the approximate length of the human trachea (windpipe)?

(a) 9 cm

(b) 11 cm

(d) 25 cm

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58. What is the bony plate between the nasal chambers called?

(a) Nasal system

(b) Conchae

(d) Nasal septum

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59. Which of the following is NOT a part of the human respiratory system?

(a) Lungs

(b) Blood

(d) Nasal cavity

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60. Which structure separates the thoracic cavity (chest) from the abdominal
cavity in humans?

(a) Ribs

(b) Diaphragm

(d) Lungs

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61. Which structure forms the structural and functional unit of lungs?

(a) Trachea

(b) Bronchi

(d) Ribs

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62. Pharynx is a part of which human system?

(a) Digestive system

(b) Respiratory system

(d) None of these

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63. Why are the walls of the trachea (windpipe) C-shaped?

(a) To remain open

(b) To avoid collapse due to pressure

(d) All of the above

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64. Choose the correct statement(s):

1. Trachea divides into two bronchi when reaching the lungs.
2. Bronchi further divide into smaller bronchioles.
3. Bronchioles end in alveolar sacs (alveoli)

(a) Only 1

(b) 1 and 2

(d) All 1, 2, and 3

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65. How many alveoli are approximately present in both human lungs?

(a) 2 × 10⁸

(b) 3 × 10⁸

(d) 5 × 10⁸

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66. How many lobes are present in the lungs?

(a) Three

(b) Two

(d) Six

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67. Which structure acts as the sound-producing box (Sound-Box) in the
human body?

(a) Larynx

(b) Pharynx

(d) Trachea

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68. Which muscles help expand the lungs during inhalation?

(a) Intercostal muscles

(b) Ribs

(d) Pericardium

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69. What occurs during breathing?

(a) Only inhalation

(b) Only exhalation

(d) None of these

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70. What is the function of the nasal chamber in the respiratory system?

(a) To detect smell and filter harmful substances

(b) To moisten and warm the air

(d) All of the above

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72. Which pigment is known as respiratory pigment?

(a) Myoglobin

(b) Hemoglobin

(d) Neutrophils

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71. Choose the correct statements—

1. Due to low O₂ in blood, the pressure in alveoli is high, so O₂ moves into the blood.
2. Due to high CO₂ in blood, it diffuses out from blood into alveoli.

(a) Only 1

(b) Only 2

(d) Neither 1 nor 2

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73. What is the average respiration rate of a normal adult human?

(a) 9–12 breaths/min

(b) 15–18 breaths/min

(d) 30–35 breaths/min

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74. During respiration, which step involves taking in oxygen and releasing
carbon dioxide?

(a) Internal respiration

(b) Excretion

(d) External respiration

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75. Oxygen is transported in blood mainly by—

(a) Blood plasma

(b) Hemoglobin

(d) Neutrophils

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76. What is the percentage of CO₂ transported as bicarbonate in blood?

(a) 10–20%

(b) 30–40%

(d) 1–2%

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77. In which part of lungs does gas exchange take place?

(a) Nasal cavity

(b) Lungs

(d) None of these

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78. What is the percentage of oxygen in inhaled (inspiration) and exhaled
(expiration) air?

(a) 21% and 16.4%

(b) 16.4% and 21%

(d) None of these

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79. What percentage of oxygen is in exhaled air?

(a) 14%

(b) 16%

(d) 25%

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80. What percentage of carbon dioxide is in exhaled air?

(a) 16%

(b) 4%

(d) 20%

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81. What is the color of oxygenated hemoglobin?

(a) Shining red

(b) Blue

(d) Yellow

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82. What is the condition called when oxygen level is low in tissues?

(a) When oxygen supply is less

(b) When oxygen use is more

(d) None of these

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83. What happens when we yawn?

(a) Mouth opens

(b) Deep breath is taken

(d) All of the above

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84. What is the name of the air exhaled after one normal breath?

(a) Tidal volume

(b) Residual volume

(d) Expiratory reserve

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85. What is formed when CO₂ combines with hemoglobin?

(a) Oxyhemoglobin

(b) Carbaminohemoglobin

(d) None of these

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86. What is the average vital capacity (maximum lung capacity) of human
lungs?

(a) 1500–3000 mL

(b) 3800–4000 mL

(d) 5400–6000 mL

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87. What is the residual volume of lungs (air that remains after full
exhalation)?

(a) 5.4 to 6 liters

(b) 4 liters

(d) 1.5–2 liters

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88. What is the vital capacity of lungs?

(a) 1500 mL

(b) 3400–3800 mL

(d) 5400–6000 mL

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89. How much air does a human breathe out after deep breathing?

(a) 500 mL

(b) 1500 mL

(d) 4000 mL

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90. Choose the correct statements —
1. The respiration process in plants and animals is similar.
2. There are differences in respiration in plants and animals.

(a) Only 1

(b) Only 2

(d) Neither 1 nor 2

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91. What type of membrane is found between pleura and lungs?

(a) Moist and slippery

(b) Dry and slippery

(d) All of the above

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92. What is the name of the instrument used to measure breathing rate?

(a) Barometer

(b) Scale

(d) All of the above

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93. Where is the cardiac notch found?

(a) In left lung

(b) In right lung

(d) Not found

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94. Which of the following is not related to breathing?

(a) It is a mechanical process

(b) It starts from the nose

(d) It involves digestion

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95. Choose the correct statements —
1. The lungs do not have muscle to expand or contract.
2. During inhalation, diaphragm contracts and chest expands, increasing lung volume.
3. During exhalation, diaphragm relaxes and moves up, decreasing lung volume.

(a) Only 1

(b) Only 2

(d) All 1, 2, and 3

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96. Respiratory quotient (RQ) or respiratory ratio is =

(a) Volume of CO₂ released / Volume of O₂ absorbed

(b) Volume of O₂ absorbed / Volume of CO₂ released

(d) Volume of CO₂ released / Volume of O₂ released

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97. What is the condition called when lungs are completely deprived of
oxygen?

(a) Hypoxia

(b) Anoxia

(d) Necrosis

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98. Which of the following statements is correct?
1. A person cannot survive with one lung.
2. A person can survive with one lung, but its capacity is reduced.

(a) Only 1

(b) Only 2

(d) Neither 1 nor 2

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99. How is carbon dioxide transported in human blood?

(a) As carbaminohemoglobin

(b) Dissolved in plasma

(d) All of the above

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100. Which of the following reactions is correct for both aerobic and
anaerobic respiration?

(a) Glucose is converted to ethyl alcohol and CO₂

(b) Glucose is broken into pyruvate in cytoplasm

(d) Glucose is broken into lactic acid

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101. Which of the following is not true for hemoglobin?

(a) Hemoglobin can carry oxygen but not carbondioxide

(b) Hemoglobin can carry carbondioxide but not oxygen

(d) Hemoglobin carries oxygen at alveoli but releases it in tissues

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102. In the human body, where is the iron reserve mainly found?

(a) Liver

(b) Bones

(d) Spleen

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103. During ATP formation in cells, which factor is essential?

(a) Glucose

(b) Oxygen

(d) Phosphorus

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104. What happens when excess ATP is produced in the body due to
respiration?

(a) Stored as glycogen

(b) Used up

(d) Decomposed

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105. Which of the following is a waste product of aerobic respiration?

(a) Glucose

(b) Oxygen

(d) Urea

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106. How many cells are in human lungs?

(a) 100 million

(b) 200 million

(d) 300 million

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107. What is released during human respiration?

(a) Oxygen

(b) Carbon dioxide

(d) Carbon monoxide

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🦴 Chapter 13: Skeletal System of Human Body

Control and Coordination in Plants and Human Body

Chapter 10:Excretion in Plants and Humans

Chapter 9:Transport in Plant and Human Body

Respiration in Plants and Humans

🧪 Biomolecules – Component of Food

🌿 Nutrition in Plants and Humans – Practice Questions

🧬 Biological Classification of Animal Kingdom

🌱 Chapter 4: Biological Classification of Plants

Micro-organism

Respiration in Plants and Humans