Absorption of Water and Minerals by Roots
ICSE · Class 10 · Biology
Flashcards for Absorption of Water and Minerals by Roots — ICSE Class 10 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat percentage of water content is found in herbaceous plants?
Answer
Herbaceous plants contain 70-80% water by body weight. This is higher than woody plants (40-50%) and land plants in general (40-80%), but lower than aquatic plants (75-98%).
Define imbibition and give two examples.
Answer
Imbibition is the process of adsorption of water molecules by dry hydrophilic colloids due to surface attraction. Examples: (1) Swelling of dry seeds during germination (2) Wooden doors and windows sw…
What is diffusion and what factors affect its rate?
Answer
Diffusion is the movement of molecules from higher concentration to lower concentration when in direct contact. Rate depends on: (1) Size of molecules (2) Temperature (3) Concentration gradient. Great…
Compare permeable, semipermeable, and selectively permeable membranes.
Answer
Permeable: Allow both solute and solvent to pass (e.g., cell wall). Semipermeable: Allow only solvent (water) to pass (e.g., cellophane). Selectively permeable: Allow water and selected solutes to pas…
Define osmosis and state the condition required for it to occur.
Answer
Osmosis is the movement of water molecules through a semipermeable membrane from region of higher concentration to lower concentration. It requires a semipermeable membrane and concentration gradient …
What happens during endosmosis and when does it occur?
Answer
Endosmosis is the movement of water into the cell through a semipermeable membrane. It occurs when a cell is placed in a hypotonic solution (lower solute concentration than cell sap). The cell becomes…
What happens during exosmosis and when does it occur?
Answer
Exosmosis is the movement of water out of the cell through a semipermeable membrane. It occurs when a cell is placed in a hypertonic solution (higher solute concentration than cell sap). The cell beco…
Define hypotonic, hypertonic, and isotonic solutions with their effects on cells.
Answer
Hypotonic: Lower solute concentration than cell - causes endosmosis, cell becomes turgid. Hypertonic: Higher solute concentration than cell - causes exosmosis, cell becomes flaccid. Isotonic: Equal so…
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