Osmosis and Diffusion in Plant and Animal cells Essay

This essay has a total of 1408 words and 11 pages.

Osmosis and Diffusion in Plant and Animal cells


A) 4. The cell membrane of a plant in a hypotonic solution expands and in a
hypertonic solution, the cell membrane shrinks.



5. Cells do not burst when placed in a hypotonic solution because the cell wall does not
give way. The cell wall is a strong wall to keep the structure of the cell.



B) 2(a). Nothing happened to the blood cell in a botanic solution


(b). When water is added to the blood cells the cell membrane expands and sometimes bursts


(c). When blood cells are in a hypertonic solution the cell membrane shrivels


4. The blood cells shrank in the hypertonic solution because water left the cell. The
blood cells expanded and sometimes burst in the hypotonic solution because there is more
water inside the cell than usual, which means there is an abundance of water inside the
cell, which is making it hard for the cell membrane to hold it in.



Discussion:


1) Osmosis—a special type of diffusion, the way water moves through a selectively
permeable membrane.



Diffusion—movement of molecules from a region of higher concentration to a region of lower concentration.


2) a) solute—substance dissolved in a fluid to form a solution


b) Solvent—fluid that dissolves the solute


c) Brownian movement—is the random movement of particles causes by collisions with molecules


d) Selectively permeable membrane—membrane that will allow only a selected type of materials, others are prevented


e) Osmotic pressure—is the pressure that develops in a system due to osmosis


f) Isotonic—the concentration is the same in two locations


g) Hypotonic—the concentration of the solute is lower than the concentration of the water in the cell


h) Hypertonic—the cell has a higher concentration of solute than the concentration of water


i) Plasmolysis—contraction of the cell contents due to the loss of water


j) Flaccid—is the state of a cell once its plasmolysis the cell membrane becomes limp and soft


k) Cyclosis—a circular flow of protoplasm within the cell walls without affecting the cell membrane


l) Turgor pressure—internal pressure that adds to the strength of a cell and builds up
when water moved by osmosis into a cell



m) Concentration gradient –a comparison between two locations


n) Lysis—is the term used to refer to disrupted cells


o) Crenated—refers to red blood cells when they are placed in a hypertonic solution and shrink


p) Dialysis—is the movement of solute through a selectively permeable membrane


3) Molecules move from a region of high concentration to low concentration became due to
their random movement they bump together and move to places where there is nothing to bump
into. They eventually find their way around became of their random movement.



4) “Bulk flow” is different from diffusion became when there is bulk flow through a
membrane than all materials are able to pass through. During diffusion, there is a
selectively permeable membrane which allows only retain materials to pass through (high
concentration to low concentration, needs energy, ATP used)



Question:


1) What effect would putting salt on a slug have? Why?


Putting salt on a slug would suck all the water out of the slug. The water moves from
inside of the cell (high concentration of water) to outside of the cell (lower
Continues for 6 more pages >>




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