Diffusion, Osmosis, Active Transport

Question 0

Things that increase the rate of diffusion

Answer 0

• More particles
• Bigger surface area to diffuse across
• Shorter distance to diffuse
• Temperature
• Mechanical movement (stirring or wind)

Question 1

What is diffusion

Answer 1

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration

Question 2

Which diffuses faster a liquid or a gas?

And why?

Answer 2

Gas.

Because they can move more easily as the particles are more spread out.

Question 3

The rate of diffusion is faster when the concentration gradient is _________

Answer 3

Bigger

Question 4

Diffusion is slower when there is a _______ distance over which diffusion occurs

Answer 4

Larger

Question 5

A plant cell put in a dilute solution becomes _________

Answer 5

Turgid

Question 6

What is osmosis

Answer 6

The net diffusion of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration

Question 7

Plasmolysed is when the cytoplasm __________

Answer 7

Shrinks

Question 8

Osmosis will lead to the swelling of a raisin, but it will not burst because …

Answer 8

It is a plant

Question 9

What will happen if we add acid to a hole in agar (colour)

Answer 9

It will turn red/pink

Question 10

What type of transport protein is involved in active transport

Answer 10

Carrier protein

Question 11

What is active transport

Answer 11

Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration

Question 12

The only way active transport can take place is to use energy produced by

Answer 12

Respiration

Question 14

Cells involved in active transport usually have a lot of _________________ to provide the energy they need

Answer 14

Mitochondria

Question 15

A typical example of diffusion

Answer 15

In the lung of a mammal, oxygen moves from the alveoli to the blood

Question 16

A typical example of osmosis

Answer 16

In the kidney of a mammal, water moves from the nephron to the blood

Question 17

A typical example of active transport

Answer 17

In a flowering plant, there is an uptake of mineral salt which moves from the soil to the cytoplasm in a root hair cell.

Question 18

What happenes when a plant is watered well

Answer 18

All its cells will draw water in by osmosis and become plump and swollen (Turgid)

Question 19

The contents of the cell push against the cell wall - this is called __________pressure. What does this do?

Answer 19

Turgor pressure

Helps support the plant tissues

Question 20

How does a plant become flaccid

Answer 20

If there’s no water in the soil - cells lose water and lose turgor pressure

Question 21

What sort of molecules can diffuse through cell membranes

Answer 21

Glucose
Amino acids
Water
Oxygen

GAWO

Question 22

What sort of molecules can’t diffuse through cell membranes

Answer 22

Starch
Proteins

SP

Question 23

Name 3 factors which affect the movement of substances

Answer 23

Surface area to volume ratio
Temperature
Concentration gradient

Question 24

Small things have a __________ sure area to volume ratio

Answer 24

Greater

Question 25

The rate of diffusion, osmosis and active transport is higher in cells with a _________ surface area to volume ratio

Answer 25

Larger