1. Where does the breakdown of glucose into pyruvate occur?
a. Mitochondria
b. Cytoplasm
c. Chloroplast
d. Nucleus
2. In the absence of oxygen, pyruvate is converted into:
a. Carbon dioxide and water
b. Ethanol and carbon dioxide
c. Lactic acid
d. ATP
3. Which of the following is NOT a product of anaerobic respiration in yeast?
a. Ethanol
b. Carbon dioxide
c. Lactic acid
d. ATP
4. What is the role of ATP in cellular activities?
a. Provides energy
b. Provides carbon dioxide
c. Provides oxygen
d. Provides glucose
5. Assertion: Aerobic respiration releases more energy than anaerobic respiration.
Reason: Aerobic respiration involves the complete breakdown of glucose.
a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c. Assertion is true, but Reason is false.
d. Assertion is false, but Reason is true
6. In which organelle does the breakdown of pyruvate using oxygen occur?
a. Cytoplasm
b. Mitochondria
c. Chloroplast
d. Nucleus
7. What causes muscle cramps during sudden activity?
a. Accumulation of lactic acid
b. Excess oxygen
c. Excess carbon dioxide
d. Lack of glucose
8. Assertion: Mucus in the nasal passage helps in filtering air.
Reason: Mucus traps dust particles and pathogens.
a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c. Assertion is true, but Reason is false.
d. Assertion is false, but Reason is true.
9. Assertion: Stomata are closed during the night in plants.
Reason: Plants do not perform photosynthesis at night.
a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c. Assertion is true, but Reason is false.
d. Assertion is false, but Reason is true.
10. Which structure in fish helps in the uptake of oxygen from water?
a. Lungs
b. Gills
c. Skin
d. Fins
11. Where does the exchange of gases take place in human lungs?
a. Bronchi
b. Trachea
c. Alveoli
d. Larynx
12. What ensures that the air passage does not collapse in the human throat?
a. Alveoli
b. Diaphragm
c. Cartilage rings
d. Mucus lining
13. Match the following respiratory structures with the organisms:
|
Organism |
Respiratory Structure |
|
i) Fish |
a) Alveoli |
|
ii) Humans |
b) Gills |
|
iii) Earthworm |
c) Skin |
a. i-a, ii-b, iii-c
b. i-b, ii-a, iii-c
c. i-c, ii-b, iii-a
d. i-a, ii-c, iii-b
14. What respiratory pigment is present in human red blood cells?
a. Chlorophyll
b. Haemoglobin
c. Myoglobin
d. Cytochrome
15. Which product is formed during alcoholic fermentation?
a. Carbon dioxide
b. Ethanol
c. Lactic acid
d. Oxygen
16. Which process generates the most ATP?
a. Glycolysis
b. Fermentation
c. Aerobic respiration
d. Anaerobic respiration
17. Assertion: The rate of breathing in aquatic organisms is faster than terrestrial organisms.
Reason: Aquatic organisms use dissolved oxygen which is lower in concentration
compared to atmospheric oxygen.
a. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c. Assertion is true, but Reason is false.
d. Assertion is false, but Reason is true.
18. The energy released during cellular respiration is used to synthesize which molecule?
a. Glucose
b. ATP
c. Pyruvate
d. Carbon dioxide
19. Which of the following is NOT involved in the respiration process?
a. ATP production
b. Oxygen intake
c. Glucose breakdown
d. Chlorophyll synthesis
20. What triggers the opening and closing of stomata in plants?
a. Water movement in guard cells
b. Carbon dioxide concentration
c. Oxygen concentration
d. Light intensity
Answer Key:
1. b) Cytoplasm
2. b) Ethanol and carbon dioxide
3. c) Lactic acid
4. a) Provides energy
5. a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
6. b) Mitochondria
7. a) Accumulation of lactic acid
8. a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion
9. a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
10. b) Gills
11. c) Alveoli
12. c) Cartilage rings
13. b) i-b, ii-a, iii-c
14. b) Haemoglobin
15. b) Ethanol
16. c) Aerobic respiration
17. a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
18. b) ATP
19. d) Chlorophyll synthesis
20. a) Water movement in guard cells
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