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Gaseous exchange
10 Class 10 Biology questions with answers and explanations.
Printable worksheet with answer key
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Gaseous exchange in plants takes place through the:
- 1 Xylem
- 2 Stomata
- 3 Phloem
- 4 Roots only
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Correct answer: Stomata
Stomata let carbon dioxide and oxygen move in and out of leaves.
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Gaseous exchange in humans takes place in the:
- 1 Trachea
- 2 Bronchi
- 3 Alveoli
- 4 Larynx
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Correct answer: Alveoli
Alveoli are thin walled air sacs surrounded by capillaries.
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The muscle that helps in breathing is the:
- 1 Diaphragm
- 2 Biceps
- 3 Heart
- 4 Stomach
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Correct answer: Diaphragm
The diaphragm and intercostal muscles change the volume of the chest.
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During inhalation, the diaphragm:
- 1 Contracts and flattens
- 2 Stays still
- 3 Stops moving
- 4 Relaxes and rises
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Correct answer: Contracts and flattens
It contracts and flattens, enlarging the chest cavity.
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Oxygen is carried in the blood mainly by:
- 1 Plasma
- 2 Platelets
- 3 White blood cells
- 4 Haemoglobin
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Which disease inflames the lungs and fills the alveoli with fluid?
- 1 Pneumonia
- 2 Anaemia
- 3 Typhoid
- 4 Diabetes
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Correct answer: Pneumonia
Pneumonia is an infection that affects the alveoli.
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The windpipe is also called the:
- 1 Trachea
- 2 Larynx
- 3 Pharynx
- 4 Bronchus
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Smoking mainly damages the:
- 1 Hair
- 2 Lungs
- 3 Nails
- 4 Skin only
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The gas given out during exhalation in larger amount than in air breathed in is:
- 1 Argon
- 2 Carbon dioxide
- 3 Nitrogen
- 4 Oxygen
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Stomata are opened and closed by:
- 1 Root hairs
- 2 Phloem
- 3 Guard cells
- 4 Xylem