photosynthesis Flashcards
where does photosynthesis take place and why
choroplasts in green plant cells as they contain pigments e.g chlorophyll, which absorb light
is photosynthesis endo or exo
endothermic, light is taken from environment
photosynthesis WORD EQUATION
carbon dioxide + water —> glucose + oxygen
photosynthesis SYMBOL EQUATION
6CO2 + 6H2O → C6H12O6 + 6O2
5 ways plants use glucose
respiration
making cellulose
making amino acids
stored as oils or fats
stored as starch
how do plants use glucose for respiration
respiration transfers energy from glucose.
now plant can convert the rest of the glucose into other substances
how/why do plants use glucose for making cellulose
glucose converted to cellulose
makes strong plant cell walls
how do plants use glucose for making amino acids
glucose combined with nitrate ions from soil.
makes amino acids which are then made into proteins
how do plants use glucose to store as oils or fats
glucose turns into lipids (fats and
oils).
for storing in seeds
how do plants use glucose to store as starch
glucose turned into starch
gets stored in roots, steams and leaves. ready for when photosynthesis isnt happening e.g winter
why foes starch being insoluble make it better for storing than glucose
glucose isnt insoluble so it would draw in lots of water and swell
4 example of limiting factors of photosynthesis and example
light eg night
temperature eg winter
CO2 concentration eg if its warm and bright
chlorophyll eg diseased or environmental stress
why is chlorophyll a limiting factor of photosynthesis
affected by disease or environmental stress. damages chloroplasts or restricts chlorophyll production. less light absorbed
what energy in used in photosynthesis
light
what happened to the rate of photosynthesis as light level rises
increases steadily
up to certain point
any further, temp or co2 is now limiting factor
describe rate of photosynthesis as co2 increases
increase up to a point
any further, temp becomes limiting factor
what happens to the rate of photosynthesis as temperature changes
too low - enzymes work slowly
too hot - enzymes denature
explain rate of photosynthesis as light changes practical
light placed at distance from pondweed
for one minute, count amount of bubbles
move set distance further (10cm)
record data
repeat again for mean
or
oxygen collects in capillary tube, then syring draws it alongside a ruler
what is the inverse square law
light intensity
(is proportional to)
1/distance^2
how can you artificially create ideal farming conditions in a greenhouse FOR HEAT
greenhouse traps heat so temp doesnt become limiting.
in winter, use a heater.
in summer, use shades and ventilation
how can you artificially create ideal farming connections in a green house
FOR LIGHT
artificial light
how can you artificially create ideal farming conditions in a greenhouse FOR CARBON DIOXIDE
use a paraffin heater. as it burns, it makes co2 as a by-product
5 ways to artificially create ideal farming environment
greenhouse
heater or shades for temo control
artificial light
paraffin heater
enclosed from pests/disease
