Absorption, Transport and Water Loss in Plants — Syllabus
Telangana Open School (TOSS) · Class 12 · Biology
What Absorption, Transport and Water Loss in Plants covers in Telangana Open School (TOSS) Class 12 Biology: 4 topics, for the 2026-27 session.
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Topics in Absorption, Transport and Water Loss in Plants
Water Absorption in Plants
- Water is mainly absorbed by root hairs from the soil.
- Root hairs increase surface area for absorption.
- Capillary water in the soil is the most readily available form for plants.
Osmosis and Water Potential
- Osmosis is the diffusion of water through a semi-permeable membrane from higher to lower water concentration.
- Water potential (ψ) determines the direction of water movement — water moves from high ψ to low ψ.
- Pure water has ψ = 0; adding solutes makes ψ negative.
Transport of Water in Xylem
- Water moves upward through xylem vessels from roots to leaves.
- Root pressure is a positive pressure that pushes water up but is insufficient for tall trees.
- Cohesion-Tension Theory is the most accepted explanation for ascent of sap.
Translocation of Organic Solutes
- Organic solutes like sucrose are transported through phloem.
- Source (e.g., leaf) produces food; sink (e.g., root, fruit) consumes or stores it.
- Translocation occurs in both directions depending on source-sink relationship.
Key Concepts
Central concept: Water Movement in Plants
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