Energy Transfers Q's Flashcards
(7 cards)
1
Q
When measuring the effect of wavelengths of light on photosynthesis, what should be kept constant?
A
- temperature
- pH
- carbon dioxide conc
- time
- intensity
- same type of cell
2
Q
What would happen to pH of a solution of algal cells in light?
A
- pH increases
- more carbon dioxide absorbed
3
Q
Why is photosynthesis low at specific light intensities?
A
- less absorption of certain light intesnisites
- low photoionisation/ photolysis in light dependent reation of photosynthesis so less rate of photosynthesis
- some represent the colour of chlorophyll
4
Q
Talk about the effect of differeing carbon dioxide concentrations in a forest in:
- 24hrs
- height
A
- night = high carbon dioxide concentration
- no photosynthesis- no light dependent reation
- in light- net uptake of CO2
- decrease in C02 with height
- at ground level, less Co2 as less photosynthesising organisms
5
Q
What is the advantage of stomata closing when light is turned off?
A
limit water loss- maintains constant water content needed to prevent wilting
6
Q
Why does more chlorophyll = more growth?
A
- Faster ATP and NADPH production
- more light independent reaction
- produced more sugars
- more energy
- more protein synthesis = more growth
7
Q
Why is Co2 a good measure of net productivity?
A
measures gross photosynthesis rates
