11.1 Overview of photosynthesis Flashcards
1
Q
What are the three main stages in photosynthesis?
A
- Light energy captured
- Light Dependent Reaction
- Light Independent Reaction
2
Q
Where is the site of the overall photosynthesis reaction on a plant?
A
Chloroplasts on the leaf (largely)
3
Q
How are the structure of leaves adapted for photosynthesis? 9 points
A
- a large surface area to absorb sunlight
- leaves arranged to avoid overlapping
- thin so short diffusion gradient
- transparent cuticle and epidermis
- long narrow upper mesophyll cells with lots of chloroplast
- numerous stomata for gas exchange
- stomata open and close in response to gas exchange
- air spaces in lower mesophyll cells to allow gas diffusion
- xylem bring water to leaves phloem carries sugar away
4
Q
Overall equation for photosynthesis
A
6CO2 + 6H20 –> C6H12O6+6O2
5
Q
How is light absorbed by the plant?
A
chloroplast pigments
6
Q
What is the role of grana?
A
Stacks of thylakoids where the LDR takes place which are joined by intergranal lamellae
7
Q
What is the role of the stroma?
A
light independent reaction takes place
contains structures such as starch grains
