Surface Area To Volume Ratio

Question 1

Why do microscope organisms exchange substances directly with their environment

Answer 1

Relatively low rate of respiration
Large surface area to volume ratio

Question 2

What two specialised systems do multicellular organisms have

Answer 2

Respiratory
Transport

Question 3

You always do a ratio to + which

Answer 3

1
Volume
SA:V
X. : 1

Question 4

How to find SA to volume ratio

Answer 4

Divide surface area by volume

Question 5

In the agar block practical why do you not need a fixed volume of acid

Answer 5

Only need to cover the agar

Question 6

In agar practical one of the sides may tough the wall of beaker how to stop this?

Answer 6

Swirl contents at regular intervals

Question 7

Suggest limitations of agar practical method

Answer 7

Not all acids in contact with acid
Couloir change is subjective so hard to determine end point

Question 8

Suggest limitation of using agar blocks in agar practical

Answer 8

Cells have different shapes and there are no membranes
+ diffusion is a passive process and agar is not living

Question 9

Explain why single called organism carry out gas exchange directly

Answer 9

Have a high surface area to volume ratio and this means a more rapid rate of diffusion so faster uptake of oxygen

Question 10

Larger cells have a ….. surface area to volume ratio

Answer 10

Smaller

Question 11

3 reasons why populations might have low levels of genetic diversity

Answer 11

Genetic bottleneck
Founder effect
Inbreeding