Multiple choice

Openings of stomata are surrounded by ____.

  1. epidermal cells

  2. chloroplast

  3. subsidiary cells

  4. guard cells

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Guard cells are specialized cells that surround each stoma and control its opening and closing by changing shape. Epidermal cells form the outer layer, chloroplasts contain chlorophyll for photosynthesis, and subsidiary cells may support guard cells but don't directly control stomata.