Know definitions of- Brownian movement, diffusion, os permeable, test for starch
ID: 143127 • Letter: K
Question
Know definitions of- Brownian movement, diffusion, os permeable, test for starch( movement, diffusion, osmosis, dialysis, solution, solvent, selectively and iodine), test for glucose (benedict's). For lodine and starch what color is it if positive, negative? For Ben edict's and glucose-colors if + or-? Know the consequence are 1) isotonic, 2) hypotonic, or 3) hypertonic. When will a red blood cell or plant cell take on water or lose water? Know the results of our dialysis experiment-which chemicals entered and left the bag. What starch? remained in the bag and why didn't it cross the dialysis bag? Consider water, lodide, glucose and How did the chloroplasts of Elodea change appearance when treated with pure water compared to salt water? Spread out compared to clumped together? s for plant an d animal cells that are exposed to external environments thatExplanation / Answer
(1)Brownian movement-In fluid randomly movement of particles is known as Brownian movement.
(2)Diffusion-Movement of molecules from higher concentration to lower concentration to lower concentration is known as diffusion.
(3)Osmosis-Movement of water from lower concentration to higher concentration through a plasma membrane is known as osmosis.
(4)Dialysis-Process of separating excess fluid and waste products from an organism is known as dialysis.
(5)Solution-Solution is a mixture of different type of solute and solvents.
(6)Solvent-It is a liquid and part of a solution which dissolves a solid.
(7)Selectively permiable-It is a part of cellular membrane that only allows selective molecules to come in and out.
(8)Test for starch-The iodine test for starch is used to determine the volume of starch in different ingredient.
For solid sample,peel of the vegetable and use a clean spatulla to remove samples of powdered food.Then add a few drop of iodine solution to the white side of the piece of that vegetable.
For liquid,in a dry testube take 10cm3 of the sample of liquid food.Then add few drop of iodine solution.
If in observation a blue black colour developed then starch is present and if there are no change in colour then starch is not present.
(9)Test for glucose-Benedict's test is used to test for identify the reducing sugar in carbohydrates.When Benidict's solution and carbohydrates are heated,then after observation if no colour change and remains blue colour,reducing sugar is absent.Example-sucrose.
If the colour is reddish precipitate then reducing sugar is present.Example-glucose.
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