** light **

Question 1

The diffusion constant depends on what 3 things

Answer 1

Fluid temperature
Rate of mixing
Obstructions

Question 2

Warm water has ______ diffusion

Answer 2

Fast

Question 3

The ______ the distance, the faster the diffusion rate

Answer 3

Smaller

Question 4

Molecular vs transport diffusion

Answer 4

Molecular = movement of molecules themselves (vibration) allows them to travel across concentration gradient

Transport diffusion = caused by turbulent flow

Question 5

Is molecular or transport diffusion faster

Answer 5

Transport

Question 6

Light is needed for 3 things for water

Answer 6

• needed for photosynthesis
• its a visual/sensory cue for organisms -> feeding, predation
• light heats water

Question 7

T/f: light is more effective of heating water than air

Answer 7

False it’s less effective of heating water because a lot of it gets reflected off water top and even the photons that make it inside some of them are reflected

Question 8

Why does light behave differently in water than air

Answer 8

Diff densities
Water has other shit floating in it that absorbs/reflects the light

Question 9

Light intensity _____ with depth

Answer 9

Decreases

Question 10

Low productivity lakes appear _______

Answer 10

Blue

Question 11

High productivity lakes appear _____ because…

Answer 11

Green
Because plants need to eat red/blue for photosynthesis = takes away the colour. Plants don’t need green wavelength = reflect it = green colour of lake

Question 12

The temperature of water controls ______

Answer 12

Biological activity

Question 13

3 Ways that a lake can heat up

Answer 13

Solar radiation/light
Diffusion from atmosphere
Warmer water source (precipitation, groundwater, storms)

Question 14

Heat is distributed in water via

Answer 14

Diffusion and advection

Question 15

Differences in heating can…

Answer 15

• lead to water currents
• generate density differences