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The endodermis of a dicot stem stores starch grains and is therefore also called the:
AStarch sheath
BBundle cap
CBundle sheath
DPiliferous layer
Answer & Solution
Correct answer: A. Starch sheath
1. In the dicot stem the endodermis is the innermost layer of the cortex.
2. Its cells are barrel-shaped and single-layered.
3. These cells are packed with starch grains.
4. Because of this starch, the layer is also called the starch sheath.
5. Option B bundle cap is a sclerenchyma patch outside the phloem, the trap.
6. Option C bundle sheath surrounds a whole vascular bundle, so it is wrong.
7. Option D piliferous layer is the root epiblema, not a stem layer.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Internal Structure of Dicot Stem", p.184_
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