Topic 5A- Photosynthesis and Respiration Flashcards
1
Q
What is the overall reaction for photosynthesis?
A
water + carbon dioxide -> glucose + oxygen
2
Q
what are the two stages of photosynthesis?
A
light dependent stage
light independent stage
3
Q
List three things that the rate of photosynthesis is affected by
A
- carbon dioxide concentration
- light intensity
- temperature
4
Q
What is the site of photosynthesis?
A
chloroplasts
5
Q
How are chloroplasts adapted to photosynthesis?
A
- stack of thylakoid membranes called grana (large SA)
- network of proteins in the grana hold the chlorophyll in a very specific manner (to absorb the max amount of light)
- the granal membrane has a selectively permeable membrane to establish a proton gradient
- chloroplasts contain DNA and ribosomes (allowing them to synthesise proteins needed in the light dependent reaction)
6
Q
What is photolysis?
A
the splitting of water with light
7
Q
What is photoionisation?
A
when light hits the chlorophyll molecules in PSII causing the electrons to become excited
8
Q
What does the charge separation from photoionisation cause?
A
the process of photolysis
9
Q
What is produced when water is split?
A
1 molecule of oxygen
4 protons (H+)
4 electrons
10
Q
A
