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Absorption, Transport and Water Loss in Plants

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Absorption, Transport and Water Loss in Plants — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

51 questions25 flashcards5 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?
Absorption, Transport and Water Loss in Plants covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Absorption, Transport and Water Loss in Plants — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 51 practice questions available for this chapter. Revise formulas and 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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