B8 - Photosynthesis Flashcards
1
Q
What kind of reaction is photosynthesis?
A
Endothermic
2
Q
Symbol equation for photosynthesis?
A
6CO2 + 6H20 ~ C6H12O6 + 6O2
3
Q
How are leaves adapted for photosynthesis? (6)
A
- Broad = Large SA for light to fall on
- Thin = diffusion distances for gases are short
- Contain chlorophyll to absorb light
- Veins to bring water and remove produce of photosynthesis (xylem + phloem)
- Air spaces to allow CO2 to get to cells and oxygen to leave by diffusion
- Guard cells open and close stomata to regulate gas exchange.
4
Q
Limiting factors of photosynthesis?
A
Light, temperature and CO2 conc. and amount of chlorophyll
5
Q
Equation for light intensity?
A
L.I = 1/distance2
6
Q
What do plants convert spare glucose into?
Why?
A
Starch.
Because it’s insoluble.
7
Q
Uses of glucose for a plant?
A
- Produce lipids
- Produce cellulose to strengthen cell walls
- Produce amino acids for protein synthesis
8
Q
Inverse square law of light?
A
If the distance is doubled, the intensity of reduced by 4 times.
If distance is trebled, the intensity if reduced by 9 times
