B1 : Osmosis

Question 1

What is osmosis

Answer 1

diffusion of water from a dilute solution to a concentrated solution through a partially-permeable membrane

Question 2

What is isotonic

Answer 2

When the water concentration outside the cell is equal to the water concentration inside the cell

Question 3

What is hypotonic

Answer 3

A hypotonic solution has a higher water concentration than
the cell this means water moves from the solution into the cell

Question 4

What is hypertonic

Answer 4

hypertonic solution is one in which the water concentration in the solution is lower than the cell causing water to move from the cell into the solution

Question 5

What happens to a plant cell in a hypotonic solution

Answer 5

In a hypotonic solution water moves into a plant cell and causes them to swell and appear turgid

Question 6

What happens to a plant cell in a hypertonic solution

Answer 6

When in a hypertonic solution the plant cell will lose water and appear plasmolyzed.

Question 7

Why does a cell get described as plasmolyzed

Answer 7

A plant cell is described as plasmolyzed when a plant cell membrane pulls away from the cell wall.

Question 8

What moves in Osmosis?

Answer 8

Water molecules

Question 9

What does semi-permeable mean?

Answer 9

Semi-permeable means a membrane that only allows certain size molecules to fit through such as water.
While preventing the the movement of larger molecules like sugar and salt from entering or leaving the membrane.

Question 10

What is the formula to calculate percentage change in mass?

Answer 10

Percentage change= change in mass/intial mass x100.

Question 11

Why is percentage change used instead of change in mass?

Answer 11

It increases the validity of the results that are achieved. It will reduce the affect of other factors on the results.

Question 12

What does Isotonic mean?

Answer 12

The amount of water and solute in the solution are the same.

Question 13

If the solution is isotonic to the cell what is happening to the water?

Answer 13

We do not see movement of water because the concentration of water and solute are equal both sides of the membrane.

Question 14

What does hypotonic mean?

Answer 14

There is a higher concentration of water on the outside of the cell than on the inside.

Question 15

If the solution is hypotonic to the cell what is happening to the water?

Answer 15

We would expect to see the water move into the cell until the concentration of water becomes the same on both sides of the membrane.