Question Paper – Respiration in Organisms
Maximum Marks: 75
Section A – Multiple Choice Questions (1 mark each × 10 = 10 marks)
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The cell organelle where cellular respiration takes place is:
a) Ribosome
b) Nucleus
c) Mitochondria
d) Golgi apparatus -
The byproduct of anaerobic respiration in human muscles is:
a) Ethanol
b) Carbon dioxide
c) Lactic acid
d) Oxygen -
Which of the following organisms respires through spiracles?
a) Frog
b) Cockroach
c) Fish
d) Earthworm -
The average breathing rate of an adult human being is:
a) 5–8 times per minute
b) 10–12 times per minute
c) 15–18 times per minute
d) 25–30 times per minute -
Which structure in plants allows exchange of gases in woody stems?
a) Guard cells
b) Stomata
c) Lenticels
d) Xylem -
Which organisms are called anaerobes?
a) Animals breathing through lungs
b) Plants
c) Organisms surviving without oxygen
d) Amphibians -
During heavy exercise, the muscle cells respire:
a) Only aerobically
b) Only anaerobically
c) Both aerobically and anaerobically
d) Not at all -
Which of the following releases the maximum energy?
a) Anaerobic respiration in muscles
b) Anaerobic respiration in yeast
c) Aerobic respiration
d) Breathing -
In fish, gaseous exchange takes place through:
a) Lungs
b) Gills
c) Trachea
d) Skin -
Overwatering plants may kill them because:
a) Roots cannot absorb water
b) Soil becomes too hard
c) Roots do not get oxygen
d) Stems rot
Section B – Assertion & Reason (2 marks each × 5 = 10 marks)
Directions: Choose the correct option:
(A) Both Assertion and Reason are true, and Reason explains Assertion.
(B) Both are true, but Reason does not explain Assertion.
(C) Assertion is true, Reason is false.
(D) Assertion is false, Reason is true.
-
Assertion: Mitochondria are called the powerhouse of the cell.
Reason: They are the site of cellular respiration and energy release. -
Assertion: Yeast is used in wine-making.
Reason: It undergoes anaerobic respiration and releases ethanol. -
Assertion: We feel cramps after heavy exercise.
Reason: Excess lactic acid is formed in muscles due to anaerobic respiration. -
Assertion: Breathing and respiration are the same processes.
Reason: Both involve gaseous exchange in the lungs. -
Assertion: Plants die if overwatered.
Reason: Excess water fills soil pores, blocking oxygen supply to roots.
Section C – Short Answer Questions (3 marks each × 7 = 21 marks)
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Differentiate between aerobic and anaerobic respiration with two examples.
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Define breathing. Explain inhalation and exhalation.
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Why do we feel hungry after physical activity?
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Explain why hot water bath or massage relieves muscle cramps.
-
Describe the mechanism of breathing in human beings.
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How do earthworms and frogs carry out respiration?
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Explain how respiration occurs in plants through stomata and lenticels.
Section D – Matching Type (2 marks each × 4 = 8 marks)
-
Match the following:
| Column A | Column B |
|---|---|
| A. Cockroach | i. Skin respiration |
| B. Fish | ii. Spiracles |
| C. Earthworm | iii. Lenticels |
| D. Woody stems | iv. Gills |
-
Match the following:
| Column A | Column B |
|---|---|
| A. Anaerobic respiration in yeast | i. Lactic acid |
| B. Anaerobic respiration in muscles | ii. CO₂ + Ethanol |
| C. Aerobic respiration | iii. Water + CO₂ |
| D. Respiration in plants | iv. Oxygen release |
Section E – True/False (1 mark each × 6 = 6 marks)
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Cellular respiration occurs in chloroplasts. ( )
-
Frogs can respire through both lungs and skin. ( )
-
Breathing rate increases during exercise. ( )
-
Anaerobes survive only in the presence of oxygen. ( )
-
Lactic acid accumulation in muscles causes cramps. ( )
-
Respiration in roots occurs through root hairs. ( )
Section F – Long Answer Questions (5 marks each × 4 = 20 marks)
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Explain cellular respiration in detail with a diagram of mitochondria.
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Describe aerobic and anaerobic respiration with diagrams and examples.
-
Explain respiration in human beings with a neat diagram of the respiratory system.
-
Describe respiration in plants and explain why overwatering can kill plants.
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