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 11
A plant cell is placed in distilled water. What will happen to the cell?
A plant cell with a water potential of -0.7 MPa is placed in a solution with a water potential of -0.3 MPa. In which direction will water move?
Define water potential and explain its significance in plant water relations.
Describe how stomatal opening is regulated by potassium ions.
Describe the cohesion-tension theory of water transport in plants.
Describe the effect of high humidity on the rate of transpiration.
A plant cell is placed in distilled water. What will happen to the cell?
A plant cell with a water potential of -0.7 MPa is placed in a solution with a water potential of -0.3 MPa. In which direction will water move?
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 due to excess water intake
Which component of water potential is always negative in plant cells?
(1) Pressure potential
(2) Solute potential
(3) Gravitational potential
(4) Matric potential
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 the concentration gradient
(4) Movement of water from high solute concentration to low solute concentration
Which of the following best explains the term 'imbibition'?
(1) Uptake of water by living cells
(2) Absorption of water by dry colloidal substances causing them to swell
(3) Loss of water from leaves
(4) Movement of water through xylem
The loss of water from the internal tissues of leaves to the atmosphere is called __________.
The main driving force for the upward movement of water in the xylem is __________.
The main tissue responsible for the upward transport of water in plants is __________.
The movement of water through the spaces between cell walls is called the __________ pathway.
True or False: Guttation is the loss of water in the form of vapor from the aerial parts of plants.
True or False: The apoplast pathway is blocked at the endodermis by the Casparian strip.
True or False: The Casparian strip in the endodermis prevents the passive flow of water and solutes into the stele.
True or False: The opening and closing of stomata are regulated by changes in turgor pressure of guard cells.
