A. Water absorption
B. Gas exchange (CO₂ intake, O₂ release)
C. Food storage
D. Defense against pests
Explanation: Stomata are small openings on the leaf surface that facilitate the exchange of gases, allowing plants to take in carbon dioxide for photosynthesis and release oxygen.
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The correct answer to the question: "Main function of stomata:" is "Gas exchange (CO₂ intake, O₂ release)".