Plant Water Relations
Biology ⇒ Plant Biology
Plant Water Relations starts at 8 and continues till grade 12.
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See sample questions for grade 12
A plant cell with a water potential of -0.5 MPa is placed in a solution with a water potential of -0.8 MPa. In which direction will water move?
A wilted plant is placed in pure water. What will happen to its cells?
Calculate the solute potential (Ψs) of a cell sap at 25°C if the molarity is 0.2 M. (Use Ψs = -iCRT, where i = 1, C = 0.2 mol/L, R = 0.0831 L·bar/mol·K, T = 298 K)
Calculate the water potential (Ψ) of a plant cell if the solute potential (Ψs) is -0.7 MPa and the pressure potential (Ψp) is 0.5 MPa.
Define water potential and explain its significance in plant water relations.
Describe how root hairs increase the efficiency of water absorption in plants.
Describe the cohesion-tension theory of water transport in plants.
Describe the effect of high soil salinity on plant water uptake.
Explain how stomatal opening and closing are regulated in response to environmental conditions.
Explain the difference between diffusion and osmosis in the context of plant water relations.
Explain the difference between guttation and transpiration.
Explain the role of aquaporins in plant water relations.
Explain the term 'incipient plasmolysis' and its significance in plant physiology.
Name the structure in roots that forces water and solutes to cross the plasma membrane before entering the xylem.
A plant is exposed to an environment with high atmospheric humidity and low soil water availability. Predict and explain the likely changes in its transpiration rate and water uptake.
A researcher observes that a certain plant species closes its stomata during the day and opens them at night. What type of photosynthetic adaptation does this plant likely exhibit, and how does this adaptation benefit its water relations?
Calculate the pressure potential (Ψp) in a plant cell if the total water potential (Ψ) is -0.3 MPa and the solute potential (Ψs) is -0.8 MPa.
Describe the impact of negative pressure (tension) in the xylem on the risk of cavitation and embolism in tall plants.
Explain how the presence of mycorrhizal associations can influence plant water relations, especially under drought conditions.
Explain why water potential in the atmosphere is usually much lower than in plant tissues, and discuss the significance of this gradient for water movement in plants.
