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Question: In the supermarket, lettuce and other products are often sprayed with water. Explain why this makes vegetables crisp.

Short Answer

Expert verified

Water absorbed by plant cells allows them to remain turgid. Therefore, to keep the vegetables crispy, water is sprayed on lettuce and other similar products.

Step by step solution

01

Movement of molecules

All molecules possess some kinetic energy which allows them to diffuse in the surroundings. The diffusion rate will be faster, given that the concentration gradient is faster. On the other hand, osmosis results in the movement of water from high pressure to the area of low pressure.

02

Hypotonic solution

A hypotonic solution is that which possesses lesser particles when compared to other solutions. These solutions are generally used to dehydrate hospitalized patients.

03

Explanation for water spray on lettuce leaves

Water contains fewer molecules dissolved in it when compared to plant cells. Due to this, water is absorbed by the plant cells. This results in turgidity of cells of vegetables instead of plasmolysis of cells.

In plasmolysis, the plasma membrane is detached from the wall, and plant cells shrink. The turgidity allows to retain the crispiness of vegetables like spinach and lettuce, and their wilting does not occur.

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Question: An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the environment as shown in the accompanying diagram. The membrane is permeable to water and the simple sugars glucose and fructose but impermeable to the disaccharide sucrose.

  1. Draw solid arrows to indicate the net movement of solutes.
  2. Is the solution outside the cell isotonic, hypotonic or hypertonic?
  3. Draw a dashed arrow to show the net osmosis if any.
  4. Will the artificial cell become more flaccid, more turgid or stay the same?
  5. Eventually, will the two solutions have the same or different solute concentrations?

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