Which is NOT a method that a plant can use to minimize the impact, or repair, an
ID: 188876 • Letter: W
Question
Which is NOT a method that a plant can use to minimize the impact, or repair, an embolism resulting from cavitation?
A. A plant may grow new xylem tracheids and vessels elements to bypass cavitated cells.
B. When stomata are closed at night, root pressure can reverse the forces that caused cavitation in the first place, and the gases can go dissolve back into to the solution.
C. The plant may open stomata and pull the air bubble out of the xylem by increasing transpiration.
D. Pits between tracheids and vessel elements allow water to move laterally to bypass the embolism.
A. A plant may grow new xylem tracheids and vessels elements to bypass cavitated cells.
B. When stomata are closed at night, root pressure can reverse the forces that caused cavitation in the first place, and the gases can go dissolve back into to the solution.
C. The plant may open stomata and pull the air bubble out of the xylem by increasing transpiration.
D. Pits between tracheids and vessel elements allow water to move laterally to bypass the embolism.
Explanation / Answer
Answer:- Option C.
Cavitation in plants occurs in the xylem, when the tension of water in the xylem increases. This tension results in vaporisation of water locally and producing embolism. The dissolved air within the water at that site expands and fills the tracheids. The cavitation and embolism is harmful to the plant and therefore, there are different ways by which plant can repair the cavitation.
One of the way to use the root pressure to dissolve the air, however this is possible in only short plants. At night, when stomata are closed, transpiration absent and root pressure is high. The high root pressure reduces tension in xylem water and allows air to re-dissolve in the xylem solution.
Thus, option B is correct method and hence not right answer
The plant opts for producing new xylem vessels and tracheids so as to replace the older damaged tracheids and vessels.
Thus, option A is correct method and hence not right answer
The other way is byimporting solutes into the xylem or in tracheids by use of ray cells. The solutes are imported by osmosis through bordered pits. The water entering along with the solutes redissolve the air.
Thus, option D is correct method and hence not right answer
The stomata, when are opened, pulls the water from the xylem towards the leaves. The transopiration thus increases, however if the temperature is low, the water pressure builds up inside the xylem resulting in cavitation.
Thus,option C is not the repair method and hence is the correct answer.
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