MCQ
In land plants, the guard cells differ from other epidermal cells in having.
- ✓Chloroplasts.
- BMitochondria.
- CCytoskeleton.
- DEndoplasmic reticulum.
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$I$. It checks the mixing of oxygenated and deoxygenated blood in heart
$II$. It circulates only oxygenated blood through heart.
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