Plant Water Relation — Flashcards
Maharashtra Board · Class 12 · Biology
22 flashcards for Plant Water Relation (Maharashtra Board Class 12 Biology) to test yourself on key terms and facts.
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What are the key properties of water that make it biologically important for plants?
Answer
Water has several biologically important properties: 1) Liquid at room temperature and excellent solvent for most solutes, 2) Inert with neutral pH making it ideal transport medium, 3) High specific h…
Describe the structure and function of root hairs in water absorption.
Answer
Root hairs are cytoplasmic extensions of epiblema cells, approximately 1-10mm long, tube-like, colorless, unbranched, and ephemeral. Structure: Large central vacuole surrounded by thin cytoplasm, plas…
What types of water are present in soil and which type is available for plant absorption?
Answer
Soil water types: 1) Gravitational water - percolates deep due to gravity, not available to plants, 2) Hygroscopic water - adsorbed by soil particles, cannot be absorbed by roots, 3) Combined water - …
Define imbibition and explain its role in water absorption by roots.
Answer
Imbibition is the swelling of hydrophilic colloids due to adsorption of water. The substance that adsorbs water is imbibant, and water that gets imbibed is imbibate. In root hairs, the cell wall (made…
What is Diffusion Pressure Deficit (DPD) and how is it related to water potential?
Answer
DPD is the difference between diffusion pressure of pure solvent and solvent in a solution. Coined by B.S. Meyer (1938), also called Suction Pressure. Formula: DPD = OP - TP (where OP = Osmotic Pressu…
Compare and contrast the three types of solutions in osmotic systems.
Answer
1) Hypotonic solution: Weak solution with low osmotic concentration, causes endosmosis and cell turgidity. 2) Hypertonic solution: Strong solution with high osmotic concentration, causes exosmosis and…
Explain the relationship between Osmotic Pressure (OP), Turgor Pressure (TP), and Wall Pressure (WP) in plant cells.
Answer
Osmotic Pressure (OP): Pressure required to stop solvent entry into cell. Turgor Pressure (TP): Pressure exerted by turgid cell sap on cell membrane and wall. Wall Pressure (WP): Counter pressure exer…
What is plasmolysis and under what conditions does it occur?
Answer
Plasmolysis is exo-osmosis in a living cell when placed in hypertonic solution. The protoplast shrinks and recedes from the cell wall, creating a gap filled by external solution. Cell becomes flaccid …
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