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Casparian strips in the endodermis are made up of which substance?
APectin
BCellulose
CLignin
DSuberin
Answer & Solution
Correct answer: D. Suberin
1. In the monocot root endodermis, the band-like thickenings are described as Casparian strips.
2. These thickenings are stated to be made of suberin.
3. Therefore suberin is the correct material.
4. Lignin thickens xylem walls, not Casparian strips, so it is ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Internal Structure of Monocot Root", p.183_
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