alleryStart learning →Gaseous exchange in plant leaves occurs mainly through
APhloem sieve tubes in the midrib
BHydathodes at the leaf margins
CCuticle covering the upper epidermis
DStomata bordered by guard cells
Answer & Solution
Correct answer: D. Stomata bordered by guard cells
1. The chapter on gaseous exchange names stomata as the main route.
2. Each stoma is bordered by two guard cells.
3. Oxygen and CO2 enter and leave by diffusion through these openings.
4. So option A is correct.
_Source: Selina Concise Biology Class 9, Ch 7 Respiration in Plants (Mistral OCR'd PDF), section on gaseous exchange_
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