B1.7 Osmosis

Question 1

What is osmosis?

Answer 1

The diffusion of water molecules, from a region where the water molecules are in higher concentration, to a region where they are in lower concentration, through a partially permeable membrane.

Question 2

What does a dilute solution of sugar contain?

Answer 2

High concentration of water - it has low concentration of sugar (solute)

Question 3

What does a concentrated sugar solution contain?

Answer 3

Relatively low concentration of water and a high concentration of sugar

Question 4

What is isotonic?

Answer 4

When the concentration of the solutes in the solution outside the cell is the same as the internal concentration, the solution is isotonic to the cell

Question 5

What is hypertonic?

Answer 5

When the concentration of solutes in the solution outside the cell is higher than the internal concentration - the solution is hypertonic to the cell

Question 6

What is hypotonic?

Answer 6

If the concentration of solutes in the solution outside the cell is lower than the internal concentration - the solution is hypotonic to the cell

Question 7

What is plasmolysis?

Answer 7

Water leaves the cell by osmosis. The cytoplasm shrinks and pulls away from the cell wall

Question 8

What is turgid?

Answer 8

Enlarged and swollen with water