In land plants, the guard cells differ from other epidermal cells in having:
Correct answer: D. Chloroplasts
- A. Cytoskeleton
- B. Mitochondria
- C. Endoplasmic reticulum
- D. Chloroplasts
Explanation
The leaf and stem epidermis is covered with pores called stomata (sing., stoma), part of a stoma complex consisting of a pore surrounded on each side by chloroplast containing guard cells, and two to four subsidiary cells that lack chloroplasts. The guard cells differ from the epidermal cells in the following aspects: The guard cells are beanshaped in surface view, while the epidermal cells are irregular in shape. The guard cells contain chloroplasts, so they can manufacture food by photosynthesis (The epidermal cells do not contain chloroplasts). Guard cells are the only epidermal cells that can synthesis sugar. Both have cytoskeleton. Both have mitochondria. All cells (epidermal and guard cells) have endoplasmic reticullum. So correct option is D.
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