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Absorption of Water and Minerals by Roots

ICSE · Class 10 · Biology

Quick revision notes for Absorption of Water and Minerals by Roots — ICSE Class 10 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions22 flashcards5 concepts

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A table comparing the percentage of water by body weight in various land plants, woody plants, herbaceous plants, aquatic plants, and animals.
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Key Topics to Revise

1

Importance of Water in Plants

  • Water content varies by plant type: Land plants (40-80%), Woody plants (40-50%), Herbaceous plants (70-80%), Aquatic plants (75-98%)
  • Water serves as solvent for many substances and participates in metabolic reactions
  • Facilitates gas exchange by dissolving gases between organism and atmosphere
2

Imbibition and Diffusion

  • Imbibition: Adsorption of water molecules by dry hydrophilic colloids due to surface attraction
  • Occurs along diffusion gradient with maximum imbibition in agar-agar, protein, pectin, cellulose
  • Examples: Swelling of dry seeds, wooden doors/windows in rain, kneading of flour
3

Types of Membranes and Osmosis

  • Four membrane types: Impermeable (no passage), Permeable (both solute and solvent), Semi-permeable (only solvent), Selectively permeable (water and selected solutes)
  • Osmosis: Movement of water molecules through semi-permeable membrane from higher to lower water concentration
  • Can be demonstrated using thistle funnel with sugar solution and semi-permeable membrane
4

Endosmosis, Exosmosis and Tonicity

  • Endosmosis: Water entry into cell when placed in hypotonic solution, cell becomes turgid
  • Exosmosis: Water exit from cell when placed in hypertonic solution, cell becomes flaccid
  • Tonicity determines direction of water movement based on relative solute concentration

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Full Notes

Key Concepts

Water serves multiple vital functionsThe process where dry hydrophilic colloidsMovement of molecules from higher concentrationSpecial type of diffusion where waterHypotonic (lower solute concentration

Frequently Asked Questions

What are the important topics in Absorption of Water and Minerals by Roots for ICSE Class 10 Biology?
Absorption of Water and Minerals by Roots covers several key topics that are frequently asked in ICSE Class 10 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 of Water and Minerals by Roots — ICSE Class 10 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

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