There are _________ stomata per square cm of leaf surface in Tobacco plants?
Correct answer: C. 100,000
- A. 1200
- B. 12000
- C. 100,000
- D. 1000
Explanation
Tobacco leaves may have about 100,000 stomata per square centimetre of leaf surface, allowing substantial exchange of carbon dioxide, oxygen and water vapour. Students may choose 12,000 per square centimetre because that value is a plausible stomatal density for some other plants, but it is too low for the stated textbook value for tobacco.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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