3.3 Photosynthesis Flashcards
What are the 2 states of photosynthesis called?
Light reactions, carbon fixation
What do light reactions need?
Light energy from the sun, water.
During light reactions what happens to light energy from the sun?
It is trapped by chlorophyll in the chloroplasts and converted into chemical energy, used to make ATP.
During light reactions what happens to water?
It is split to produce hydrogen and oxygen which generates 1 ATP.
During light reactions what happens to the hydrogen?
It attaches to hydrogen acceptor molecules.
During light reactions what happens to the oxygen?
It diffuses out of the cell or is used in respiration.
Explain Light Reactions
Light energy from the sun is trapped by chlorophyll in the chloroplast and is converted into chemical energy, used to make ATP.
Water is split into hydrogen and oxygen which generate 1 ATP.
The hydrogen attaches to hydrogen acceptor molecules.
The oxygen diffuses out of the cell or is used in respiration.
What is need for carbon fixation?
Hydrogen, ATP and Carbon Dioxide.
During carbon fixation what produces glucose?
A series of enzyme-controlled reactions.
What can glucose (chemical energy) be used for?
Respiration
Making starch (storage)
Making cellulose (structural)
Explain carbon fixation.
Hydrogen and ATP, from light reactions, react with carbon dioxide in a series of enzyme controlled reactions to produce glucose.
What is meant by limiting factors?
Whatever is in least supply for photosynthesis will limit the rate of
photosynthesis and plant growth.
