Question

1. Did water move into the cell or out of the cell while it was surrounded by hypotonic solution?
2. In which direction did the water move through the cell membrane when the cell was surrounded by the hypertonic solution?
3. Compare and contrast what happens to an animal, a plant, and a paramecium cell in a hypotonic, an isotonic, and a hypertonic solution?
4. Could Elodea or paramecium from a freshwater lake be expected to survive if transplanted into the ocean? Explain.
5. If you were to grill a steak, would it better to put salt on it before or after you cooked it? Explain why, in terms of osmosis.
6. Why does salad become soggy and wilted when the dressing has been on it for a while? Explain why, in terms of osmosis.
7. An effective way to kill weeds is to pour salt water on the ground around the plants. Explain why the weeds die, using the principles discovered in this virtual lab.

Answer 1

WHEN CELL PLACED IN HYPOTONIC SOLUTION WATER WILL ENTER THE CELL

IF IT IS HYPER TONIC WATER WILL MOVE OUT OF THE CELL TO THE REGION OF HIGHER SOLUTE CONCENTRATION

IN AN HYPERTONIC SOLUTION THE PLANT AND ANIMAL CELL SHRINKS

IN HYPOTONIC GAIN ENOUGH WATER TO LYSE OR RUPTURE CELLWALL LEADING TO DESTRUCTION OF CELL ANIMALCELL TEND TO BE BEST IN ISOTONIC SOLUTION .THERE IS NO NET CHANGE OF VOLUME OF CELL .

INCASE OF PLANT CELLS HYPOTONIC CELL KEEPS THE VEGETABLES CRISP IN ISOTONIC SOLUTION THERE IS NO CHANGE

PARAMECIUM HAS CONTRACTILE VACULES USE TO EXPEL WATER THAT MOVES IN TO CYTOPLASM IN HYPOTONIC SOLUTIONS .IN ISOTONIC CELL WILLL BE IN DYNAMIC EQUILIBRIUM

PARAMECIUM LIVES IN FRESHWATER AND IS ITS NORMAL ENVIORNMENT ,HYPOTONIC TO THE INSIDE OF CELL .OR PARAMECIUM IS HYPERTONIC .IN HYPERTONIC SOLUTION LIKE SEA WATER CELLS VACULE LOSES WATER BUT PARAMECIUM MAINTAINS ITS VOLUME BY HOLDING AS MUCH AS WATER IT CAN ,BUT WHEN SOLUTE CONCENTRATION RISES THE NUMBER OF VACULE CONTRACTION WILL DECREASE

WHEN GRILLING A STEAK IT IS BETTER TO PUT SALT ,BECAUSE DUE TO OSMOSIS SALT DRAWS OUT THE WATER FROM THE STEAK ,DUE TO THERE BEING MORE WATER INSIDE MEAT FIBRES THAN OUT RESULTING IN MORE FLAVOURFUL STEAK

SALAD BECOME SOGGY ,WHEN WATER IS TRYING TO EVEN OUT THE CONCENTRATION OF SALT IN THE DRESSING AND THE LEAVES ,HENCE LOTS OF WATER NEEDED IN THE DRESSING TO REDUCE THE CONCENTRATION OF SALT

WEEDS REQUIRE WATER AND THIS WATER UPTAKE COMPLETED BY OSMOSIS .BY POURING SALT WATER CONCENTRATION IN SOIL DECREASED AND IT WILL BE LOWER THAN PLANTS THUS WATER FROM WEEDS MOVES IN TO THE SOIL AND PLANT DIES