photosynthesis Flashcards
the function of chlorophyll is to absorb sunlight energy and transfer this energy to election which then leave chlorophylll, from your knowledge of photosynthesis, give two possible fates of these electrons
pass to electron carriers
returns to chlorophyll
name another molecule which can provide electrons during photosynthesis
water
identify a source of water for photosynthesis in the plant
soil
suggest one reason why horticulturists might use carbon dioxide enrichment in a greenhouse
increased photosynthesis
write a balance chemical equation to summarise photosynthesis
6CO2 + 6H20 ->light/chlorophyll
C6H12O6+6O2
describe in detail the main events of each pathway in the light stage
electron passes along an electron transport chain energy released in the form of ATP
pathway 1-electron retinas to chlorphyll
pathway 2-electron does not return to chlorphyll
explain why the seconds stage of photosynthesis is called the dark stage
it does not require light
explain why the dark stage is an anabolic process
it prods a large molecule from smaller molecules
name a suitable photosynthesis organism you used for this investigation
elodea
why was elodea suitable for this investigation
aquatic plant
why was it important to keep other facts, such as temperature, constant during the investigation
dont effect the rate of photosynthesis
how did you keep the temperature of the organism constant for the activity
water bath
explain how you measure the rate of photosynthesis
counted the number of O2 bubbles in 1 minute intervals
in which cell organelle does photosynthesis occur
chloroplast
name the pigment essential for photosynthesis
chlorophyll
describe one way in which horticulturists can increase plant yield in greenhouses
more light
water is split during stage 1 using the energy in light, what is the name given to this process
photolysis
what is produced as a by product of the splitting water
oxygen
describe how NADPH is produced
hydrogen ions join NADP- to form NADPH
name stage 2
dark stage
what is the role of ATP in stage 2 of photosynthesis
to transfer energy
what does ATP stand for
adenosine triphosphate
what is the end product of stage 2
glucose
what is the function of chlorphyll in plants
to absorb light/energy
suggest why it is an advantage that chlorophyll contains a number of chemical rather than just one
absorb more energy
outline the events of the dark stage of phtotsynthesisi
energy from ATP
NADPH release electron
NADPH release protons
CO2 combines with electron and protons
form glucose
explain how the dark stage is necessary for the continuation of the light stage
ADP+P and NADP+ return to the light stage to be used again
describe one way to increase plant production in a greenhouse
use a range of colours of light
name the type of nutrition exhibited by organisms that carry out photosynthesis
autotrophic
what is the role of stomata in photosynthesis
gas exchange
what particles are realised from chlorphyll during the light stage
electrons
give an account of the events of pathway 2
two energised electrons leave the electron acceptor
these join to NADP+ to form NADPH
water is split by photolysis into
hydrogen ions - these join NADP- to form NADPH
oxygen - release into the atmosphere
energised electrons - returns to chlorophyll
name two products of he light stage
ATP
NADPH
outline the events of the light independent stage
ATP supplies energy
NADPH provides electrons and H ions
CO2 supplies carbon to make glucose
suggest an advantage to the cell of using ATP as ana energy source, instead of breaking dow a sugar molecule every time energy is needed
energy is available from immediate use
name the nitrogenous base and the sugar present in ATP
nitrogenous gas - adenine
sugar present in ATP - ribose
give two ways by which photosynthesis could be accelerated in horticulture
increase CO2
increase temperature
is the dark stage anabolic or catabolic, explain
anabolic - smalle molecules(CO2 and H20) form larger molecules(glucose)
