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Absorption, Transport And Water Loss In Plants

NIOS · Class 12 · Biology

Quick revision notes for Absorption, Transport And Water Loss In Plants — NIOS Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions25 flashcards5 concepts

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A diagram illustrating the process of osmosis, where solvent molecules move across a semipermeable membrane from a region of higher solvent concentration (lower solute concentration) to a region of lo
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Key Topics to Revise

1

8.1 Four Basic Phenomena - Permeability, Diffusion, Osmosis, and Plasmolysis

  • Permeability is the property of a membrane to allow passage of substances. Plant cell walls are fully permeable; biological membranes are selectively permeable
  • Diffusion is the random movement of molecules from high to low concentration, independent of membrane presence. Requires fully permeable membrane if one is present
  • Osmosis is the movement of water molecules through a semipermeable membrane from high water concentration to low water concentration region
2

8.2 Water Potential and Related Concepts

  • Water potential (ψ) is the energy or tendency of water molecules to do work or leave a system
  • Pure water has the highest water potential set as zero (ψ = 0)
  • Solutions have negative water potential values because dissolved solutes reduce available water molecules
3

8.3 Absorption of Water by Plants

  • Water is primarily absorbed by root hairs (modified epidermal cells) from soil capillary water
  • Root hairs increase surface area for water absorption
  • Water can also be absorbed by leaves and stems in some cases
4

8.4 Translocation of Organic Solutes (Phloem Transport)

  • Translocation is the movement of organic and inorganic solutes from one plant part to another
  • Phloem is the tissue responsible for translocating sugars produced in photosynthesis
  • Leaf is the source where food (sugars) is produced through photosynthesis

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Full Notes

Key Concepts

Permeability is the property ofDiffusion is the spontaneous interminglingOsmosis is a special typeSolutions are classified based on theirPlasmolysis occurs when a cell

Frequently Asked Questions

What are the important topics in Absorption, Transport And Water Loss In Plants for NIOS Class 12 Biology?
Key topics in Absorption, Transport And Water Loss In Plants include Overview of Water Relations in Plants, Chapter Overview - Water Absorption, Transport and Loss in Plants, Classification of membrane types and their permeability properties in plant structures. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Absorption, Transport And Water Loss In Plants — NIOS 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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