The number of stomata present per cm2 of leaf is:
Correct answer: B. 10,000
- A. Less than 100
- B. 10,000
- C. One million
- D. None of the above
Explanation
Number of stomata depend on environmental factors like carbon dioxide concentration. The average number of stomata is about 10,000 per square mm of leaf surface.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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