Surface Area and Volume

Question 1

Smaller organisms have a _________ surface area : volume (SA:V) ratio

Answer 1

Larger

Question 2

As size increases, SA:V ratio _________

Answer 2

Decreases

Question 3

Why do organisms need to exchange substances with the environment?

( 3 points )

Answer 3

1. Waste products need to be excreted
2. Oxygen and Glucose are needed for aerobic respiration
3. Heat is exchanged

(Waste products e.g CO2, urea)

Question 4

What is a unicellar organism?

Answer 4

Small orgamism

Question 5

What is a Multicellular organism?

Answer 5

Big organism

Question 6

As body mass __(1)__ , rate of oxygen consumption __(2)__

(2 points)

Answer 6

1. Increases (↑)
2. Decreases (↓)

Question 7

What does respiratino release?

Answer 7

Heat

Question 8

A small animal with a ↑ SA:V ratio has a faster ___(1)___ per gram of body mass, so has a faster rate of ___(2)___ to replace heat

(2 points)

Answer 8

1. Heat loss
2. Respiration

Question 9

__(1)__ organisms lose less heat thorugh their surface due to __(2)__ SA:V ratio so __(3)__ repiration is required to replace heat

(3 points)

Answer 9

1. Large (↑)
2. Small (↓)
3. Less (↓)