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Absorption, Transport and Water Loss in Plants — Revision Notes

Telangana Open School (TOSS) · Class 12 · Biology

Absorption, Transport and Water Loss in Plants revision notes for Telangana Open School (TOSS) Class 12 Biology: 4 topics in quick points.

51 questions25 flashcards2 formulas & key relations5 concepts

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Key Topics to Revise

1

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.
2

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.
3

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.
4

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.

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Full Notes

Key Concepts

Diffusion is the movement of moleculesWater potential (ψ) is the tendencyWater moves through two pathwaysProposed by DixonTranspiration is water loss as vapor

Frequently Asked Questions

What are the important topics in Absorption, Transport and Water Loss in Plants for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Absorption, Transport and Water Loss in Plants include Water Absorption in Plants, Osmosis and Water Potential, Transport of Water in Xylem, Translocation of Organic Solutes. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Absorption, Transport and Water Loss in Plants for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 51 practice questions on Absorption, Transport and Water Loss in Plants. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All Telangana Open School (TOSS) Class 12 Biology Revision Notes

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