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PLANT PHYSIOLOGY - PLANT WATER RELATION
Test Description: GET YOUR KNOWLEDGE ON WATER PROPERTIES AND WATER TRANSPORT IN PLANT INTO TEST WHILE PLAYING THE GAMES. LEARN, PLAY AND ENJOY.
Instructions: Answer all questions to get your test result.
1) Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
A
The insects are small enough to see the individual water molecules, they are able to step carefully from one molecule to othe
B
The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
C
The insect’s feet are non-polar, so they are repelled by the polar water molecules and pushed away from the water’s surface
D
The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
2) Which of the following properties of water enables it to move from the roots to the leaves of plants?
A
Water expands as it freezes
B
Water is an excellent solvent
C
Water moderates temperature
D
Water exhibits cohesive behaviour
3) Why can water have no net charge but have slight charges in different parts of the molecule?
A
The hydrogen end is slightly negative and the oxygen end is slightly positive
B
The oxygen end is slightly negative and the hydrogen end is slightly positive
C
Because it is hydrophobic
D
The hydrogen and oxygen ends change in polarity
4) Plant roots are able to absorb water because of ....?
A
universal solvent
B
surface tension
C
evaporation
D
capillary action
5) The rate of transpiration will _________ if the atmospheric pressure is low.
A
Can’t be determined
B
Stay unchanged
C
Increase
D
Decrease
6) Root pressure occurs when there is
A
Less transpiration and more absorption
B
More transpiration and less absorption
C
Less transpiration and less absorption
D
More transpiration and more absorption
7) Why does the rate of transpiration increase if the light intensity is increased?
A
The stomata open wider to let more carbon dioxide into the leaf for photosynthesis
B
The humidity increases, which makes the rate of transpiration increase.
C
The root hair cells become more permeable to water, letting more water into the plant and through the xylem
8) Why does water loss slow down if a plant is put into a plastic bag?
A
The light intensity increases
B
The humidity increases
C
The temperature increases
D
The transpiration increases
9) How are the xylem and phloem arranged in plant roots?
A
Evenly spaced out across the root
B
In the centre of the root
C
In bundles near the edge of the root
10) How are sucrose and amino acids transported in a plant?
A
Through the phloem
B
Through the xylem and phloem
C
Through the xylem
*select an answer for all questions
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