Photosynthesis

Question 1

Describe The Photolysis of water during the Light-dependant reaction of photosynthesis.

Answer 1

The Photolysis of Water -
- light energy is absorbed by the chlorophyll, splitting water into hydrogen ions, electrons and oxygen molecules.
- the hydrogen ions are picked up by NADP to form NADPH for the light-independent reaction.
- the electrons replace those lost during the photoionisation of chlorophyll.
- the oxygen is either used for respiration, or diffuses out of the leaf during the stomata.

Question 2

Describe The Photoionisation of Chlorophyll during the light-dependant reaction of photosynthesis.

Answer 2

• light energy from the sun is absorbed by the chlorophyll, resulting in the electrons present in the chlorophyll gaining energy, so raising them up an energy level, causing them to leave the chlorophyll - photoionisation.