4.3.1 PHOTOSYNTHESIS

HideShow resource information
What is an autotroph?
organisms that fix CO2 using energy from the sun or from simple chemical rections
1 of 23
What is a photoautotroph? give some examples
autotroph that requires sun light - plants, algae and blue-green bacteria
2 of 23
What is a heterotroph?
take in fixed carbon in the from of organic molecules
3 of 23
What is photosynthesis?
the foxing of carbon dioxide and its reduction to carbohydrate by sing hydrogen using light energy
4 of 23
How is light energy used in photosynthesis?
to produce complex organic molecules
5 of 23
How is the energy released from the simple organic molecules made in photosynthesis released?
chemical potential energy // respiration - oxygen
6 of 23
where does photosynthesis take place?
in chloroplasts
7 of 23
Briefly outline photosynthesis
two stages // light dependent stage - thylakoid mem where light is used to split water // light independent stage (calvin cycle) in stroma- CO2 reduced to carbohydrate using ATP and NADH
8 of 23
Outline the structure of a chloroplast
...
9 of 23
outline the function of the inner membrane of chloroplasts
contain transport proteins which control the entry and exit of substances between cytoplasm and stoma
10 of 23
outline the function of grana
provide SA for photosynthetic pigments, electron carriers and ATP synthase// for light dependent reaction// photosynthetic pigments are arranged int photosystems to allow max absorption held in pace by proteins
11 of 23
outline the function of the stroma
surround gina, so products of light dependent stage can readily pass into stroma
12 of 23
What is photosynthetic pigment?
molecules that absorb light energy
13 of 23
outline the role of photosynthetic pigments
absorbs a range of wavelengths in visible light spectra/ each has own distinct peak of absorption/ other wavelengths reflected (green)/ accessory pigments focus light energy onto primary pigment/ transfer energy to chlorophyll a molecules
14 of 23
Outline the role of chlorophyll a molecules
found at centre of photosystem molecules I and II// in the thylakoid mem arranged in funnel shaped structures (photosystems) // act together to capture as much light energy as possible
15 of 23
How does a high light intensity affect photosynthesis?
stomata open - more CO2/ more excitation of electrons/ more photophosphorylation/ more ATP and reduced NADP/ more GP reduced and phosphorylated to TP/ more TP phosphorylated to RuBP
16 of 23
How does a low light intensity affect photosynthesis?
GP cannot be changed to TP/ GP will accumulate/ less RuBP/ less CO2 fixed
17 of 23
How does a high conc of CO2 affect photosynthesis?
more CO2 fixation/ more GP/ more TP/ more region of RuBP/ open stomata may lead to loss of water by transpiration may cause wilt - could lead to stress response which will cause stomata to close
18 of 23
How does a low conc. of CO2 affect photosynthesis?
affects light independent stage only// RuBP will accumulate/ less GP and TP
19 of 23
How will a high temperature affect photosynthesis?
little effect on dependent stage/ will affect enzymes in independent stage - photorespiration will exceed photosynthesis // ATP and NADPH are dissipated and wasted// reduces overall rate of photosynthesis// high water loss
20 of 23
How do growers control CO2 concs? why?
burn methane or oil fired heaters// increase rate of photosynthesis providing theres no other limiting factor
21 of 23
How could you experimentally measure the rate of photosynthesis?
vol of O2 produces/ rate of uptake of CO2/ rate of increase in dry mass of plants
22 of 23
Describe how to experimentally investigate how light intensity affects photosynthesis
...
23 of 23

Other cards in this set

Card 2

Front

What is a photoautotroph? give some examples

Back

autotroph that requires sun light - plants, algae and blue-green bacteria

Card 3

Front

What is a heterotroph?

Back

Preview of the front of card 3

Card 4

Front

What is photosynthesis?

Back

Preview of the front of card 4

Card 5

Front

How is light energy used in photosynthesis?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes resources »