Transport In Cells

Question 1

What diffusion?

Answer 1

Where particles of a high concentration move to a low concentration

Question 2

What’s the difference in concentration called?

Answer 2

Concentration gradient

Question 3

Give an example of diffusion in cells

Answer 3

CO2 moves into cells by diffusion(cells) in photosynthesis

Question 4

Give the factors diffusion can be affected by

Answer 4

Concentration gradient
Temperature
Surface area of the cell membrane separating different regions

Question 5

How does the concentration gradient affect diffusion?

Answer 5

The greater the difference in concentration, the quicker the rate of diffusion

Question 6

How can temperature affect the rate of diffusion?

Answer 6

Higher the temp- more kinetic energy the particles will have- so they’ll move more quickly

Question 7

How can surface area affect the rate of diffusion?

Answer 7

The greater the surface area, the faster the rate of diffusion

Question 8

Give the aim of the practical- investigation the effect of concentration on rate of diffusion

Answer 8

To determine if higher concentrations diffuse faster

Question 9

Give the risks for the practical investigation the effect of concentration on rate of diffusion

Answer 9

hydrochloric acid is corrosive- if it touched the skin it should be washed off
- goggles should be worn at all times

Question 10

What shows greater diffusion in the diffusion practical?

Answer 10

If as the concentration of hydrochloric acid increased the distance the colour change of the agar, from pink to colourless also increased

Question 11

What’s osmosis?

Answer 11

The diffusion of water molecules, from a high concentration to a low concentration through a partially permeable membrane

Question 12

What substance does osmosis only refer to?

Answer 12

Water molecules

Question 13

How will water move in and out of cells?

Answer 13

Through osmosis

Question 14

What’s supports the cell from bursting when taking in water from osmosis?

Answer 14

The strong cellulose cell wall outside the cell membrane

Question 15

What happens to cells from osmosis in pure water?

Answer 15

The cell contents push against the cell wall and the cell becomes turgid( enlarged and swollen with water). Fully turgid cells support the stem of non-woody plants

Question 16

What happens to plant cells in concentrated water

Answer 16

The cell contents lose water by osmosis and the cells shrink. The cell membrane starts to pull away from the cell wall. The cell become flaccid( soft and floppy)

Question 17

What is plasmolysis?

Answer 17

In a very concentrated solution, the cell membrane pulls away from the cell wall completely

Question 18

What happens if animal cells lose or gain too much water by osmosis?

Answer 18

They don’t function efficiently

Question 19

Give the formula for water uptake in an hour

Answer 19

Water uptake in 1 hour= change on mass X 60 mins/ length of experiment in mins

Question 20

Give the change in mass formula

Answer 20

Change in mass= mass at end-mass at the start X 100

Question 21

Give the formula for ordered rank

Answer 21

Percentile/100 X number of entries in data set

Question 22

What’s active transport?

Answer 22

A process that is required to move molecules against a concentration gradient. It requires energy

Question 23

Give an example of active transport

Answer 23

-mineral ions into plant roots
-glucose from the gut into intestinal cell- from where it moves into the blood

Question 24

Give a description of active transport

Answer 24

Substances move from a low to high concentration up a concentration gradient