Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Biology
Photosynthesis
| Question | Answer |
|---|---|
| role of photosynthesis | - produces oxygen for respiration - plants use it for food -forms fossil fuels |
| Events in photosynthesis | -light is absorbed into chlorophyll -trapped energy splits water molecules to form 4 protons, 4 electrons, oxygen -electrons to chlorophyll, protons to storage. oxygen to atmosphere or respiration -light energises electrons -C6H1206 form (glucose) |
| where do energised electrons come from | chlorophyll |
| what compound is Cx(H2O)y | carbohydrate |
| what is the molecule that is used by plants to obtain the protons H+ ions used to make the compound carbohydrate | water (H2O) |
| name a molecule plants use to obtain carbon used to make carbohydrates | carbon dioxide |
| photolysis | is the splitting of water molecules using light during photosynthesis |
| photosynthesis | is the splitting of water by light |
| where does the light dependant reactions occur | inner membranes |
| where does the light independent reactions occur | stroma |
| what substance is produced in both pathway 1 and pathway 2 | ATP |
| distinguish between the fate of the energised electrons in both pathway 1 and 2 | in pathway one it returns to the chlorophyll in pathway 2 it transfers top the dark stage |
| what is the role of NADPH in the light independent stage | provides electrons and protons to combine with carbon dioxide to make glucose |
| why is photosynthesis an anabolic reaction | involves the build up of smaller molecules into larger molecules and it uses energy |
| chemical equation of photosynthesis | 6CO2 + 6H20 ---) C6H12O2 + 6O2 |
| what is the chlorophyll in | chloroplast |
| what are the energised particles released by chlorophyll | electrons |
| difference between pathway 1 and 2 in terms of energised particle movement | in pathway 1 the electrons are returned to the chlorophyll where as in pathway 2 the electrons do not return but they instead combine with other molecules to make NADHP |
| name the 2 products produced in the light dependant stage that enters into the light independent stage and name their roles | ATP - provides energy NADPH- provides electrons and protons to form glucose |
| name the products in the light independent stage that recycle into the light dependant stage | ADP NADP |
| briefly describe what happens in pathway 1 | it is a cyclical cycle high energy electrons pass from chlorophyll to a series of electron receptors each time an electron pass through a receptor it looses energy releasing ADP + Phosphate forming ATP, electron returns to chlorophyll as low energy |
| briefly describe what happens in pathway 2 | 2 high-energy electrons leave pass through electron receptors losing energy and forming ADP+P- ATP 2 electrons combine with NADP+ form NADP- photolysis occurs replacing electrons proton produced combines with NADP- form NADPH oxygen is released |
| end products of the light stage | ATP NADPH Oxygen |
| end products of dark stage | ADP Glucose oxygen NADP |
| briefly describe what happens in the dark stage | carbon from air/respiration enter chloroplast hydrogen ions and electrons are released from NADPH energy from ATP is used to convert carbon dioxide to a carbohydrate (glucose) the products of NADP+ and ADP are reused in the light stage |
| what's the dark stage also known as | Calvin cycle |
| what is the dark stage powered by and what's significant about it | enzyme reactions ,means that the stage is affected by temperature |
| what's reduction | this is the addition of electrons in relation to the formation of carbohydrates |
| why are most plants green | because green reflects light and isn't absorbed the chlorophyll makes it green |
| why does a chlorophyll have a range of pigments | to ensure optimal light absorption |
| why is the amount of carbon available for plants low and what effects does it have | there's not a lot of atmospheric carbon dioxide it slows down the rate of photosynthesis |
| methods of speeding up photosynthesis | artificial light artificial source of carbon dioxide e.g burning gas |
| what does each cluster of pigments in the chlorophyll contain | variety of pigments strategically placed chlorophyll molecule (reaction centre) electron acceptor |
| function of the pigment clusters in the chlorophyll | absorb as much light as possible |
| how does the electron in the reaction centre become high energy | the pigments in the pigment cluster transfer the absorbed energy between one another until it reaches the electron acceptor where the energy is transferred into the electron |
| experiment-examine the effects of light intensity on the rate of photosynthesis | add sodium-bicarbonate to water in a tube, cut Elodia add it to tube, fill beaker with 25' water use a thermometer, put tube in beaker, set lamp 1m from beaker, leave 5mins, count n.o of bubbles in a min, increase light/ move it closer, repeat 3-6 times |
| experiment- the effects of light intensity on the rate of photosynthesis results | as the lamp moved closer the rate of bubble production increases but at some point the rate doesn't increase anymore as the plant became saturated with light |
| formula of light intensity | light intensity = 10,000/(distance)squared |
Created by:
20sarah