Stomata are tiny openings on the leaf surface controlled by guard cells. • When guard cells lose water, they become flaccid, causing the stoma to close. • This usually happens during water stress or nighttime, helping the plant conserve water.
Stoma, found in the epidermis of leaves closes when guard cells ______?
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Question context
This question is part of 🧫 Biotechnology within the broader 🧬 Medical Science subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.