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ICSE BIOLOGY ABSORPTION BY ROOTS NOTES

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Tanay Nayak
Avalon Heights International School, Mumbai

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Disha Educentre Exhaustive Notes ~1~ 3. Absorption by Roots ABSORPTION BY ROOTS Scope of Syllabus: Characteristics of roots which make them suitable for absorbing water should be discussed with the process of absorption. Structure of a full-grown root hair must be explained. Experiments to show conduction of water through the xylem should be discussed. Mention the causative forces must be made for better understanding as per syllabus. ~ Part A ~ ROOT HAIR AND INVOLVED PROCESSES I. Definitions and Explanations 1. Imbibition 2. Diffusion 3. Root Pressure 4. Guttation II. Imbibition is a process by which the living or dead plant cells absorb water by surface attraction. Diffusion is the free movement of molecules of a substance (solute or solvent, gas, liquid) from the region of higher concentration to the region of lower concentration where the two have a direct contact. Root pressure is the pressure developed in the roots due to the continued inward movement of water through cell-to-cell osmosis, which helps in the ascent of cell sap upward through the stem. The loss of excess water from plants in the form of tiny drops along the leaf margins is known as guttation. Questions-Answers 1. What are the processes for which plants need water? ANSWER Plants need water for four processes photosynthesis, transpiration, transportation and mechanical stiffness. (i) Photosynthesis Water is a raw material in the synthesis of carbohydrates by green plants. (ii) Transpiration Water lost by the plants through its leaves must be compensated for. (iii) Transportation Water is transported from the roots to the shoots and from leaves to other plants. Dissolved substances are also transported along with it. (iv) Mechanical Water provides turgidity to cells, which impart mechanical stiffness to it. Stiffness 2. Draw a neat, labelled diagram of a root hair showing its various parts. 3. What are the different adaptations of root hairs? hairs have the following adaptations:Their cell wall is freely permeable. Their cell membrane is semipermeable. The cell sap in them contains less water (solvent) as compared to water solution. Thus, it is hypotonic. It is unicellular; i.e. it has a large surface area. It is temporary; i.e. it is soon replaced by newer root hairs. ANSWER Root Notes Prepared by Neil Valentine D Silva

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Additional Info : ICSE Biology Notes by Bhomik Acharya (bhomik1018)
Tags : icse absorption by roots plant biology, ICSE Notes and Tips.

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