Chapter 17 - Photosynthesis Flashcards
(12 cards)
1
Q
why are leaves different colours
A
photosynthetic pigments absorb different wavelengths of light
2
Q
what are photosystems made up of
A
- reaction Centre (primary pigment) and light harvesting system (accessory pigment)
3
Q
What is the importance of C-H bonds
A
- non polar
- low energy to break bonds
- store a lot of energy
- lots of energy is released
4
Q
Inter-relationship between photosynthesis and respiration
A
- photosynthesis uses light energy to synthesise organic molecules (glucose) and the energy is stored in the C-H bonds
- respiration breaks down the organic molecules into inorganic molecules releasing energy from C-H bonds using it to synthesise ATP
5
Q
Adaptations of chloroplasts
A
- large surface area of grana to maximise absorption of light energy
- thylakoids contain pigments, photosystems and electron transport chains
6
Q
What wavelength of light does chlorophyll best absorb
A
-red and blue
7
Q
Uses of Triose phosphate
A
- synthesis of complex molecules: amino acids, glucose, lipids
- regeneration of RuBP using ATP
8
Q
Light intensity as a limiting factor of photosynthesis
A
- increasing light intensity increases rate of photo ionisation and photolysis so more NADPH and ATP are produced
9
Q
Carbon dioxide concentration as a limiting factor of photosynthesis
A
- increase in carbon dioxide concentration increases rate of GP production from RuBP
10
Q
Temperature as limiting factor of photosynthesis
A
- increasing temperature increases enzyme activity (eg. RuBisCo) increasing rate
- extreme high temperatures cause enzymes and proteins in ETC to denature decreasing rate
11
Q
Where does the light dependent stage of photosynthesis occur
A
Thylakoid membrane
12
Q
Where does the light independent stage occur
A
In the stroma
