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Plant Water Relation

Maharashtra Board · Class 12 · Biology

Quick revision notes for Plant Water Relation — Maharashtra Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions22 flashcards5 concepts

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Key Topics to Revise

1

Properties of Water and Its Biological Significance

  • Water is liquid at room temperature and acts as the best universal solvent
  • High specific heat, heat of vaporization, and heat of fusion make water a thermal buffer
  • Hydrogen bonds between water molecules create cohesive and adhesive forces
2

Root Structure and Water Absorption

  • Root hair zone is the primary site of water absorption
  • Root hairs are unicellular extensions of epidermal cells (epiblema)
  • Root hair structure: thin cell wall (pectin outer, cellulose inner), large vacuole, thin cytoplasm
3

Water Absorption Mechanisms

  • Three sequential processes: Imbibition → Diffusion → Osmosis
  • Imbibition: Swelling of hydrophilic colloids (cell wall) by water adsorption
  • Diffusion: Movement from higher to lower concentration through cell wall
4

Water Potential and Plasmolysis

  • Water potential (ψ) = negative value of DPD
  • Pure water has ψ = 0, adding solutes makes it negative
  • Water flows from less negative to more negative potential

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Full Notes

Key Concepts

Water has unique properties including highRoot hairs are unicellular extensionsWater absorption occurs through three sequentialWater potential (ψ) represents the chemicalPlasmolysis occurs when cells are placed

Frequently Asked Questions

What are the important topics in Plant Water Relation for Maharashtra Board Class 12 Biology?
Plant Water Relation covers several key topics that are frequently asked in Maharashtra Board 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 Plant Water Relation — Maharashtra Board Class 12 Biology?
Understand the core concepts first, then work through the 44 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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