3.3.1

Question 1

Surface area of a sphere

Answer 1

4 pi r squared

Question 2

Volume of a sphere

Answer 2

(4 pi r cubed) / 3

Question 3

Area of a circle

Answer 3

pi r squared

Question 4

Surface area of a cylinder

Answer 4

(pi x diameter x height) + (2 x pi x radius squared)

Question 5

Volume of a cylinder

Answer 5

pi x radius squared x height

Question 6

How do you calculate SA:V ratio?

Answer 6

surface area / volume

Question 7

What does a high surface area to volume ratio mean?

Answer 7

Every part of object is quite close to the edge
Heat energy can get in or out quickly
Therefore heats/ cools quickly

Question 8

What does a low surface area to volume ratio mean?

Answer 8

Parts of the object are relatively far from the edge
Takes longer for heat energy to get in or out
Therefore heats/cools slowly

Question 9

Describe the SA:V ratio and metabolic rate of large organisms

Answer 9

Heat loss is harder
As smaller SA:V ratio
Therefore slower metabolic rate

Question 10

Describe the SA:V ratio and metabolic rate of small organisms

Answer 10

Heat is lost more easily
As larger SA:V ratio
Therefore higher metabolic rate
To maintain body temperature