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The hypodermis of a dicot stem provides mechanical support because it is composed of:
ACollenchyma cells
BParenchyma cells
CSclerenchyma cells
DChlorenchyma cells
Answer & Solution
Correct answer: A. Collenchyma cells
1. The hypodermis lies just below the epidermis of the stem.
2. In the dicot stem it has three to six layers of cells.
3. These cells are collenchyma, which give mechanical support.
4. So collenchyma is the correct tissue.
5. Option C sclerenchyma forms the monocot stem hypodermis, the trap.
6. Option B parenchyma is thin-walled and gives little support, so it is wrong.
7. Option D chlorenchyma is photosynthetic, not a support layer here.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Internal Structure of Dicot Stem", p.183_
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