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Chapter: Plant Water Relation· Biology

Identify and define ‘A’ and ‘B’ in relation to uptake of water by the root :[Figure: Transverse section of a part of root from root hair to the central xylem. Path A starts inside the root hair and runs across the cortex through the cells (cytoplasm)…

Q.9 Identify and define ‘A’ and ‘B’ in relation to uptake of water by the root :

[Figure: Transverse section of a part of root from root hair to the central xylem. Path A starts inside the root hair and runs across the cortex through the cells (cytoplasm) to the xylem. Path B starts at an epidermal cell and runs in a zig-zag manner along the cell walls of the cortex up to the endodermis and xylem.]

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Answer: A = Symplast pathway; B = Apoplast pathway.

A – Symplast pathway: movement of water from cell to cell through the living protoplasts (cytoplasm) which are interconnected by plasmodesmata. It is slower.

B – Apoplast pathway: movement of water through the non-living parts, i.e. the cell walls and intercellular spaces, without crossing any membrane. It is faster, but at the endodermis it is blocked by the Casparian strips, so water then enters the symplast.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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