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H U3 - Photosynthesi

Higher - Unit 3 - Photosynthesis

QuestionAnswer
What are the three fates of light? Transmitted, Absorbed, Reflected.
What is the photosynthetic pigment that absorbs red and blue light? Chlorophyll a
What are the accessory pigments called? Chlorophyll b and Carotenoids
Why have Carotenoid pigments? To extend the range of wavelengths absorbed and pass energy to chlorophyll a for photosynthesis
Which type of plant has a high level of chlorophyll a? Sun plants
Which type of plant has a high level of carotenoid pigments? Shade plants
Why would the presence of carotenoid pigments in shade plant leaves help them to grow? They are able to absorb light that has been transmitted through the tree.
What is the absorption spectrum? A measurement of light absorbed by a pigment.
Is the action spectrum smaller or larger than the absorption? Larger
What is the action spectrum? the action spectrum takes into account the wavelengths of light that are absorbed by all the photosynthetic pigments
What is the first stage of photosynthesis called? The Light Dependent Stage
What is the second stage of photosynthesis called? Carbon Fixation
State two uses that plants make of light energy Used to make ATP and in Photolysis.
What is photolysis? The splitting of water into hydrogen and oxygen.
What happens to oxygen in photolysis? It evolves as a byproduct.
What happens to hydrogen? Coenzyme NADP carries hydrogen to Carbon Fixation.
What is light energy absorbed by? Photosynthetic pigments
In photosynthesis, which process produces ATP? Electron transport chain
What happens during the first stage of the electron transport chain? Light energy excited electrons in pigments.
After light energy excited electrons, what happens next? Electrons are transported along the electron transport chain.
What is the final stage of the ETC? The electrons release energy to generate ATP by ATP synthase.
What is the enzyme in Carbon Fixation that fixes CO2 to RuBP?
What is RuBP converted into? 3PG
What is the role of ATP in Carbon Fixation? To phosphorylate 3PG.
What is the role of NADPH in Carbon Fixation? To provide 3PG with hydrogen.
What is 3PG converted into? G3P
What are the two roles of G3P? To regenerate RuBP and to synthesise glucose.
What are the fates of glucose? 1. Respiratory substrate 2. Synthesised into Starch or Cellulose 3. Passed onto biosynthetic pathways
What can biosynthetic pathways produce? DNA, protein and fat.
If there is limited light, what would not be produced? NADPH and ATP
If there is limited CO2, what would not be produced? 3PG
Created by: StNiniansHS
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