surface area to volume ratio (change title) Flashcards
1
Q
how to work out the SA of a cylinder
A
(2 x pi x r x l) + (2 x pi x r^2)
2
Q
how to work out the vol of a cylinder
A
(pi x r)^2 x l
3
Q
what does increase in size of an organism do to its SA:VOL
A
larger organism decreases SA:VOL
4
Q
what were the problems with unicellular organisms increasing in size (2)
A
- decreased the SA:VOL (so less SA for gas exchange compared to its VOL)
- increased diffusion distance (so it took longer for diffusion)
5
Q
how did multicellular organisms increase their SA:VOL (3)
A
- became flatter
- form tissues through specialised cells
- formed specialised gas exchange and circulatory systems
6
Q
what does it mean to be very metabolically active
A
high number of metabolic reactions at high speeds
7
Q
how did larger unicellular organisms respond to their increase in size to increase their SA:VOL (1)
A
become multicellular
8
Q
what is there a high demand for if you are very metabolically active
A
high demand for oxygen
