Why do you think it is a good idea to soak wilted lettuce in cool water before serving it?
The water is an isotonic solution relative to the cytoplasm in the plant cells, so they will gain water and the lettuce will become less wilted.
The water is a hypertonic solution relative to the cytoplasm in the plant cells, so the plant cells will lose water and the lettuce will become crisper.
Soaking the lettuce in water would have no effect.
The water is a hypotonic solution relative to the cytoplasm in the plant cells, so the plant cells will gain water and the lettuce will become crisper.
The Correct Answer is D
Choice A rationale: An isotonic solution has the same solute concentration as the plant cells, which means it has the same water potential. Water will move in and out of the plant cells at the same rate, causing them to remain unchanged in size and shape. This will not help the lettuce to become less wilted.
Choice B rationale: A hypertonic solution has a higher solute concentration than the plant cells, which means it has a lower water potential. Water will move out of the plant cells by osmosis, causing them to shrink and become plasmolysed. This will make the lettuce more wilted and not crisper.
Choice C rationale: Soaking the lettuce in water would have an effect, depending on the relative solute concentration of the water and the plant cells. Water will move across the cell membrane by osmosis, either into or out of the plant cells, causing them to change in size and shape.
Choice D rationale: A hypotonic solution has a lower solute concentration than the plant cells, which means it has a higher water potential. Water will move into the plant cells by osmosis, causing them to swell and become turgid. This will make the lettuce crisper and more appealing.
Choice E rationale: A hypotonic solution will cause the plant cells to gain water and become turgid, not more wilted. Wilted lettuce is caused by the loss of water from the plant cells, which makes them flaccid and soft.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The total magnification of a microscope is calculated by multiplying the magnification of the objective lens and the magnification of the eyepiece lens. Therefore, using a 10× objective lens with a 10× eyepiece lens would result in a total magnification of 10×10 = 100×, not 20×.
To achieve a total magnification of 20×, one would need to use a 2× objective lens with a 10× eyepiece lens, or a 10× objective lens with a 2× eyepiece lens. Therefore, the statement that the total magnification achieved using a 10× objective lens with a 10× eyepiece lens is 20× is false.
Correct Answer is B
Explanation
Choice A rationale: Up and down is incorrect because the mechanical stage upper knob does not control the vertical movement of the stage. The vertical movement of the stage is controlled by the coarse and fine adjustment knobs, which are located on the side of the microscope. The coarse adjustment knob is used to raise or lower the stage quickly, while the fine adjustment knob is used to fine-tune the focus of the specimen.
Choice B rationale: Right and left is correct because the mechanical stage upper knob controls the horizontal movement of the stage along the x-axis. The mechanical stage is a platform that holds the slide and the specimen, and it can be moved by two knobs that are located below the stage. The upper knob moves the stage right or left, while the lower knob moves the stage forward or backward.
Choice C rationale: Back and forth is incorrect because the mechanical stage upper knob does not control the horizontal movement of the stage along the y-axis. The horizontal movement of the stage along the y-axis is controlled by the mechanical stage lower knob, which is located below the stage and next to the upper knob. The lower knob moves the stage forward or backward, while the upper knob moves the stage right or left.
Choice D rationale: All of the answer choices are correct is incorrect because only one of the answer choices is correct. The mechanical stage upper knob only causes the stage to move right or left, not up and down or back and forth. The other movements of the stage are controlled by different knobs.
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