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?
Define water potential and explain its significance in plant water relations.
Describe how root hairs increase the efficiency of water absorption in plants.
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?
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?
A plant cell placed in a hypertonic solution will:
(1) Gain water and become turgid
(2) Lose water and become plasmolysed
(3) Remain unchanged
(4) Burst
Which component of water potential is always negative in plant cells?
(1) Pressure potential
(2) Solute potential
(3) Matric potential
(4) Gravitational potential
Which hormone is primarily responsible for closing stomata during water stress?
(1) Auxin
(2) Gibberellin
(3) Abscisic acid
(4) Cytokinin
Which of the following best describes osmosis in plant cells?
(1) Movement of water from a region of low solute concentration to high solute concentration through a semipermeable membrane
(2) Movement of solutes from high to low concentration
(3) Active transport of water against its concentration gradient
(4) Movement of water from high solute concentration to low solute concentration
The loss of water in liquid form from the uninjured tip of leaves is called _________.
The main force responsible for the movement of water from roots to leaves in tall trees is _________.
The pressure exerted by the plasma membrane against the cell wall due to water intake is called __________.
The process by which water is absorbed by seeds during germination is called _________.
True or False: Guttation occurs through stomata.
True or False: The Casparian strip is made of suberin and is found in the endodermis of roots.
True or False: The symplast pathway allows water to bypass the Casparian strip.
True or False: Transpiration is the process by which water is lost from the aerial parts of plants, mainly through the stomata.
