Chapter 4 Absorption By Roots

Scope of syllabus: Characteristics of roots, which make them suitable for absorbing water, experiments to explain the different phenomena, structure of a single full grown root hair, experiments to show the conduction of water through the xylem, mention of causative forces.

1) Introduction

2) Need of water and minerals for plants:

  • a) Absorption of minerals:
  1. Passive mineral absorption
  2. Active mineral absorption
  • b) General functions of minerals.

3) Water absorbing system.

4) Modes of absorption and conduction of water and minerals:

  • a) Imbibition(with experiment)
  • b) Diffusion(with experiment)
  • c) Osmosis: 1) Types of osmosis(with experiment)
  • d) Tonicity:
  1. Isotonic Solution
  2. Hypotonic solution
  3. Hypertonic solution
  4. Significance of osmosis
  • f) Difference between Diffusion and Osmosis(table)

5) Active transport

6) Turgidity and turgor pressure: significance of turgidity

7) Plasmolysis and Deplasmolysis

8) Ascent of sap(diag)

9) Experiments

10) Key Points to remember: (Summary)

11) Key terms

12) BTT(Beyond the text): Extra Info.

13) Assignments:

  • 1) Objective type(1 mark each)
  • 2) Answer in one or two sentences (1 mark each)
  • 3) Give reasons (2 marks each)
  • 4) Short notes (2/3 marks each)
  • 5) Answer in detail (4/5 marks each)
  • 6) Board questions
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