Size and surface area

Question 1

What is the formula for calculating the volume of the cylinder?

Answer 1

π x radius x height

Question 2

How does diffusion occur in single celled organisms?

Answer 2

The substances diffuse directly into the cell across the cell-surface membrane

Question 3

What do multicellular organisms need to absorb and excrete substances?

Answer 3

Specialised exchange organs and a mass transport system

Question 4

What 3 factors of an organism affect heat exchange?

Answer 4

Body size
Body shape
Adaptations for heat exchange

Question 5

How does body size affect heat exchange?

Answer 5

If an organism has a large volume, its surface area is relatively small so they won’t lose much heat.
If an organism has a small volume, it has a relatively large surface so it will lose a lot of heat

Question 6

How does body shape affect heat exchange?

Answer 6

If an animal has a compact shape, they have a small surface area compared to their volume and therefore it minimises heat loss