Water vapor exits and CO2 enters a leaf through the _.
Correct answer: A. Stomata
- A. Stomata
- B. Grana
- C. Porphyrin ring
- D. Photons
Explanation
Option A is correct. Water vapor exits and carbon dioxide (CO2) enters a leaf through tiny pores called stomata. Stomata are small openings primarily found on the undersides of leaves, although they can also be present on stems and other plant organs. Each stoma is surrounded by two specialized cells known as guard cells, which control the opening and closing of the pore.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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