Chapter 8 - Movement Through Cells

Question 1

What is Diffusion?

Answer 1

Movement of molecules from an area of high concentration to an area of low concentration. (Passive Transport-No energy required)
E.g - Bacteria getting rid of waste.

Question 2

What is Osmosis?

Answer 2

Is the movement of water molecules from a region of high concentration to a region of low water concentration across a semi-permeable membrane. (Passive Transport - No energy)

Question 3

What is Active Transport?

Answer 3

Is the movement of molecules from an area of low concentration to an area of high concentration requiring energy.
E.g - Transport of minerals from soil to inside.

Question 4

What is Plasmolysed and Turgid?

Answer 4

Plasmolysed- The cell is wilted. The cell membrane pulls away from the cell wall.
Turgid - Upright

Question 5

How Turgidity Happens?

Answer 5

1. Water enters the cell membrane and vacuole by osmosis. Therefore vacuole is full and puts pressure on the cell.
2. The cell wall is rigid and exerts pressure back.
3. No more water can enter the cell. Therefore the cell cannot stretch further so the plant is turgid. (Upright)

Question 6

How Plasmolysis Happens?

Answer 6

1. Water leaves the cell.
2. Cell membranes shrinks as the contents/ cytoplasm has low volume. Exerting no pressure.
3. The cell is plasmolysed. (Wilted)

Question 7

Process of Haemolysis

Answer 7

1. Animal Cell placed in distilled water.
2. Water moves into the cell by osmosis.
3. Cell eventually bursts.
   - Red Blood Cells

Question 8

Process of Crenation

Answer 8

1. An animal cell placed in a salt concentrated solution.
2. Water moves out of the cell.
3. Eventually shrivels up and dies.
   - Foundation of salt preservation.