Required practical 3: Effect of osmosis of plant tissue

Question 1

What is Osmosis?

Answer 1

Osmosis is the movement of water from an area of low concentration to an area of high concentration through a partially permeable membrane

Question 2

What would happen if a plant cell was placed in a concentrated solution

Answer 2

Water would move out of the cell by osmosis causing the cell to shrink

Question 3

What happens when water moves into the plant cell?

Answer 3

Expand

Question 4

What is used to get all the cyclinders of patato the same diameter?

Answer 4

Cork borer

Question 5

What must be meassured before putting the patato cyclinders in the test tube?

Answer 5

The mass

Question 6

What solution is most of the patato cyclinders placed in?

Answer 6

sugar solution

Question 7

What is used instead of tap water and why?

Answer 7

Distilled water because it contains no dissolved substances which could effect the rate of osmosis.

Question 8

What should be done after removeing the patato cyclinders from the test tude?

Answer 8

Gently roll them on a paer towel and pat them dry to remove any surface moisture

Question 9

What 2 features of the patato cyclinders must be meassured before the experiment?

Answer 9

Length of the cyclinders (ensure they are the same) and the mass

Question 10

What 2 features of the patato cyclinders must be meassured after the experiment?

Answer 10

Length of the cyclinders and the mass

Question 11

What equation is used to found out percentage change?

Answer 11

% change = (change in value/original value) X 100