Question

1.What is the importance of cell membrane?
2.Explain Plasmolysis with a diagram.
3.Which part of the cell is permeable?
4.What changes will occur in raisin and RBC when
they are placed inside a hypotonic solution and
why?

Answer 1

Answer:

1 the membrane is pilable which mean it can move and flex in response

Answer 2

Answer:

1. Not only do membranes separate the interior of the cell from the external environment, but something in the membrane itself makes important, and correct, decisions about which substances can pass into and out of the cell.
2. If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple (the picture is up )
3. The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thusfacilitating the transport of materials needed for survival
4. A blood cell placed in hypotonic solution would gain water as water will enter cell from surrounding hypotonic medium by the process of osmosis causing the cell to swell up. If the cell was placed in hypertonic solution, water would have moved out of the cell causing it to shrink. Red blood cells do not have the cell wall and contractile vacuoles and hence, would not be able to maintain their shape leading to their rupture. 
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