Diffusion & Osmosis

Question 1

Osmosis

Answer 1

Movement of waterfrom a high water to a low water concentration through a semi-permeable membrane.

Question 2

Why is osmosis special

Answer 2

Passive- requires no energy.

Question 3

Diffusion

Answer 3

The movement of molecules from an area of high to low concentration. Passive.

Question 4

Selectively permeable membranes

Answer 4

Allow some but not all substances through.

Question 5

Permeable

Answer 5

Lets substances through

Question 6

Impermeable

Answer 6

Substances cannot pass through.

Question 7

Solvent

Answer 7

A liquid eg water that dissolves other substances.

Question 8

Solute

Answer 8

A substance that has been dissolved.

Question 9

Solution

Answer 9

A mixture of solute + solvent. Salt water.

Question 10

How do amoeba survive in freshwater (less concentrated environments?

Answer 10

Bc the contractile vacuole eliminates water.

Question 11

Animal cells stay the same size in?

Answer 11

A solution with the same concentration as their cytoplasm.

Question 12

Animal cells swell and burst in

Answer 12

Less concentrated solution.

Question 13

Animal cells shrivel and die + lose water in

Answer 13

A solution more concentrated than their cytoplasm.

Question 14

Plant cells in a solution less concentrated than their cytoplasm

Answer 14

Gain water, become turgid and strong.

Question 15

Plant cells in a more concentrated solution than their cytoplasm

Answer 15

Lose water and become weak.

Question 16

High salt and sugar concentration

Answer 16

Used to remove water from micro-organisms by osmosis.

Used in food preservation.

Question 17

Experiment

Answer 17

Pg 152

Question 18

Active transport

Answer 18

Movement of molecules from a less to a more crowded area.

Uses energy.

Question 19

Hypertonic animal cell

Answer 19

Water leaves cell, shrivels.

Question 20

Isotonic animal cell

Answer 20

Ideal, water comes in and out.

Question 21

Hypotonic

Answer 21

Water comes into cell. Overinflated.

Question 22

Turgor pressure

Answer 22

The outward pressure of the cytoplasm and vacuole against the cell wall of a plant.

Question 23

Plasmolysis

Answer 23

The movement of the cell membrane away from the cell wall.