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 10
Define osmosis in the context of plant water relations.
Describe the effect of wind on the rate of transpiration.
Describe the role of cohesion and adhesion in the ascent of sap.
Describe the role of root hairs in water absorption.
Describe what happens to a plant cell in an isotonic solution.
A student places a wilted plant in water. After a few hours, the plant stands upright again. Which property of plant cells is responsible for this recovery?
(1) Plasmolysis
(2) Turgor pressure
(3) Guttation
(4) Diffusion
A plant is exposed to high light intensity and low humidity. Predict and explain the effect on its rate of transpiration.
A scientist observes that a plant growing in saline soil has developed specialized structures on its leaves to excrete excess salt. How might this adaptation affect the plant’s water relations?
A student places a wilted plant in water. After a few hours, the plant stands upright again. Which property of plant cells is responsible for this recovery?
(1) Plasmolysis
(2) Turgor pressure
(3) Guttation
(4) Diffusion
Water potential is usually measured in which unit?
(1) Joules
(2) Pascals
(3) Bars
(4) Moles
Which of the following best describes the direction of water movement in a plant?
(1) From leaves to roots
(2) From roots to leaves
(3) From stem to soil
(4) From flowers to roots
Which of the following best explains why stomata close during the hottest part of the day?
(1) To increase photosynthesis
(2) To reduce water loss
(3) To absorb more CO₂
(4) To increase guttation
A plant cell placed in a solution with lower water potential than its cytoplasm will undergo __________.
A plant cell with a turgor pressure of 0.5 MPa and a solute potential of -0.7 MPa has a water potential of __________ MPa.
The loss of water as droplets from the edges of leaves is called __________.
The movement of water from cell to cell through the cytoplasm is called the __________ pathway.
True or False: The Casparian strip in roots forces water to pass through the cytoplasm of endodermal cells.
True or False: The cuticle on leaves helps to reduce water loss.
True or False: The movement of water from the soil into the root hairs is mainly by osmosis.
True or False: The phloem is responsible for transporting water in plants.
