Photosynthesis Flashcards
In the first stage, pathways I and II relate to the passage of energised electrons.
explain what happens to these electrons in pathway I.
Electrons picked up by an acceptor passed trough carriers
Passed back to chlorophyll
Give the name of the first stage.
Lightstage
Describe the events of pathway II
1) water splits
2) Protons to pool/ NADP- formed
3) NADPH formed/ Oxygen released
Give the name of the second stage
Dark stage / Light independent stage
Give one reason why the second stage cannot happen without the first stage.
2nd stage needs end products if 1st stage - ATP and NADPH
They are necessary for dark stage reactions
Suggest one possible benefit to plants of having more than one chlorophyll pigment.
More light can be absorbed
-> leads to increased Photosynthesis
What is the main source of carbon dioxide used by plants in the dark stage of photosynthesis?
Air
State one role of NADP and one role of ATP in the dark stage of photosynthesis.
NADP - transport electrons
- transport energy
- transport Protons / H+
ATP - provides Energy
Where in a plant cell does photosynthesis take place?
Chloroplast
Give the alternative name of the first stage of photosynthesis.
Lightstage
During the first stage of photosynthesis energised electrons enter two pathways.
Where do the energised electrons come from?
Come from Chlorophyll
Name the simple compound that supplies the necessary energy for the second stage reactions.
ATP
Name the substance X, formed by the loss of a phosphate group.
ADP
The ATP cycle is kept going by Y, what is Y?
Energy
Name the openings in the leaf which allow the entry of carbon dioxide for photosynthesis. State a factor which influences the diameter of these openings.
Stomata
Light/ temperature
During photosynthesis oxygen is produced.
1) From what substance is oxygen produced?
2) In which stage of photosynthesis is oxygen produced?
3) Give two possible fates of oxygen following its production.
1) Water
2) lightstage
3) Respiration or diffuses into atmosphere
What is the primary role of chlorophyll?
It traps light
What is the equation of photosynthesis?
6Co2 + 6H2o + light -chlorophyll-> C6H12O6+6o2
Name a gas that is essential for the dark stage.
Carbon dioxide
Two products of the light stage are vital for the dark stage. Name each of them.
NADPH - protons & electrons
ATP - energy
To what group of biomolecules do the main products of the dark stage belong?
Carbohydrates
Outline major events of second stage.
Sugar formed from CO 2
ATP provides energy
NADPH provides hydrogen (H)
