Multiple choice

The stomata are surrounded by two kidney-shaped cells called

  1. hydathodes

  2. guard cells

  3. bulliform cells

  4. epidermal cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Guard cells are the specialized kidney-shaped cells that surround each stoma and control its opening and closing through changes in turgor pressure. Hydathodes are involved in guttation (water secretion), bulliform cells aid in leaf rolling in grasses, and epidermal cells are the general pavement cells forming the outer layer. The distinctive kidney shape is unique to guard cells in dicot leaves.

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