Photosynthesis
- Created by: hsmith08
- Created on: 21-04-15 18:43
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- Photosynthesis
- leaf is main photosynthetic structure
- chloroplast is the cellular organelle
- grana- stacks of 100 discs called thlakoids
- thylakoids have chlorophyll
- stroma- fluid filled matrix containing starch grains
- large surface area to absorb lots of sunlight
- arrangement of leaves minimises overlap
- thin to keep diffusion distance short
- transparent cuticle to let light through
- packed with chloroplasts
- numerous stomata for gas exchange
- open and close in response to light
- many air spaces for diffusion of gas
- phloem and xylem
- chloroplast is the cellular organelle
- 6CO2+6H2O->C6H12O6+ 6O2
- Light-dependent reaction
- Oxidation-loss of electrons
- Reduction- gain of electrons
- Reduction- gain of electrons
- chlorophyll molecule absorbs light energy which excites a pair of electrons
- electrons leave chlorophyll and are taken up by a carrier
- electrons passed a long carrier, losing energy at each stage
- energy used to make ATP
- electrons passed a long carrier, losing energy at each stage
- electrons leave chlorophyll and are taken up by a carrier
- chlorophyll replaces electrons by photolysis of water using light energy
- produces protons taken up by NADP
- thylakoids have a large surface area, proteins allow absorption of light, contains enzymes, DNA and ribosomes
- Oxidation-loss of electrons
- Light-independent reaction
- 1. carbon dioxide combines with RuBP using an enzyme
- 2.2 molecules of glycerate-3-phosphate are produced
- 3.ATP and NADPH are used to reduce GP to triose phosphate
- 4. NADP re-formed and some glucose is made
- 5. most RuBP is regenerated
- 4. NADP re-formed and some glucose is made
- 3.ATP and NADPH are used to reduce GP to triose phosphate
- diffuses from atmosphere and dissolves in water around walls of cells
- 2.2 molecules of glycerate-3-phosphate are produced
- stroma contains lots of enzymes, products from dependent can diffuse into gana, contains DNA and proteins
- 1. carbon dioxide combines with RuBP using an enzyme
- Limiting Factors
- at any given moment, the rate of a reaction is limited by the factor that is at the least favourable value
- increase in light intensity increases rate
- compensation point-no net movement of gas
- increase in CO2 increases rate
- increase in temperature increases rate
- Untitled
- leaf is main photosynthetic structure
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