Ch.2 Practice Quiz

Question 1

what happens when water cools below 4 (degrees C)?

Answer 1

it decreases in density

Question 2

how does the viscosity of water affect movement in small aquatic animals?

Answer 2

it prevents them from sinking

Question 3

sample standard deviation

Answer 3

measure of how widely spread data are

Question 4

without adaptations to control the movement of water and salts across their external surfaces, what would happen to marine animals?

Answer 4

they would accumulate too much salt in their cells

Question 5

what is the affect of a boundary layer in a photosynthetic organism?

Answer 5

it slows the rate of gas diffusion

Question 6

why are deep ocean waters typically low in oxygen?

Answer 6

a lack of photosynthetic organisms

Question 7

why are thermophilic bacteria able to withstand very high temperatures?

Answer 7

increased glycerol concentration

Question 8

what helps organisms survive a wide range of environments?

Answer 8

isozymes

Question 9

why do freshwater fish not need to drink water?

Answer 9

They are hyper osmotic:
fish have a higher solute concentration, so they intake water through their entire surfaces

Question 10

how does increased atmospheric carbon dioxide affect the ability of coral to build their exoskeleton?

Answer 10

Increased atmospheric CO2 causes increased CO2 in oceans which causes ocean acidification. Acidification reduces the availability of carbonate ions so they cannot generate enough calcium carbonate as quickly