Absorption, Transport And Water Loss In Plants — Flashcards
NIOS · Class 12 · Biology
25 flashcards for Absorption, Transport And Water Loss In Plants (NIOS Class 12 Biology) to test yourself on key terms and facts.
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What is permeability in the context of plant cell membranes?
Answer
Permeability is the property of a membrane to allow the passage of substances through it. Plant cell walls are fully permeable, allowing both solvent and solute molecules to pass through. In contrast,…
Define diffusion and explain why it does not require a membrane.
Answer
Diffusion is the intermingling of molecules of the same or different substances as a result of their random movement from a region of higher concentration to lower concentration. It does not require a…
What is osmosis and how does it differ from diffusion?
Answer
Osmosis is the special type of diffusion of solvent molecules (typically water) from a region of higher water concentration to a region of lower water concentration through a semipermeable membrane. K…
Explain the potato osmoscope experiment and what it demonstrates.
Answer
The potato osmoscope experiment demonstrates osmosis through the following steps: (1) A large potato tuber is peeled and a cavity is cut into one end; (2) Sugar solution is poured into the cavity to f…
What happens to a plant cell when placed in a hypertonic solution?
Answer
When a plant cell is placed in a hypertonic solution (where the external solution has higher solute concentration than the cell sap), water moves out of the cell by osmosis. This causes the protoplasm…
Distinguish between isotonic, hypotonic, and hypertonic solutions with reference to plant cells.
Answer
Isotonic Solution: Has the same concentration of solutes as the cell sap. The cell neither swells nor shrinks; it remains in a stable, turgid state with no net movement of water. Hypotonic Solution: H…
What is imbibition and why is it important for seed germination?
Answer
Imbibition is the absorption and adsorption of water by protoplasmic and cell wall constituents of dry plant material (seeds, dry wood) when they come in contact with water. Water is absorbed through …
Define water potential and explain why it is negative for solutions.
Answer
Water potential (ψ, psi) is the energy of water molecules or the tendency of water to leave a system—essentially, the ability of free water molecules to do work or move. Pure water has the highest wat…
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