Question

What structure in plant cells prevents lysis caused by osmosis?
a. cell membrane
b. nucleus
c. cell wall
d. chloroplast?

Answer 1

The right answer is C: cell wall

A: False, because cell membrane is known to let the osmosis occur between intracellular and extracellular medium by its structure which allows, for example, sodium and potassium to pass easily through it depending on the concentration gradient.
B and D: False because they are intracellular components of the cell, they cannot participate in osmosis prevention.

So the right answer is C: (Cell wall) Located outside the cell, surrounding the cell membrane, its structure made of cellulose offer control of the turgidity and prevent the cell osmosis.

Answer 2

Answer: The correct answer is -

c. cell wall.

Explanation:

Cell wall is a rigid, protective layer that is present outside the cell membrane of plants, algae, fungi and most of the prokaryotes.

In plants, it is made up of cellulose and provides structural strength, and also prevents from osmotic lysis.

This is because it acts as pressure vessel and prevents over expansion of cell when water enters it during osmosis (when the cell is placed in hypotonic solution, which has higher concentration of solvent).

Thus, option c) is the right answer.