life on earth Flashcards
describe the 1st stage of photosynthesis
light energy absorbed by chlorophyll in leaf and converted into ATP.
water is split into hydrogen which is used for 2nd stage and oxygen which diffuses out the leaf.
describe carbon fixation
a series of enzyme controlled reactions which use hydrogen and ATP with carbon dioxide to produce sugar
what are the general rules for limiting factors
if the question asks about LF on slope of graph the its the title on x axis
if question asks about LF on levelled off part of graph then its the title on y axis
if there is a slope with a higher temp above the slope your analysing then the LF at level off in temperature
three fates of sugar produced in photosynthesis
stored as starch in leaf
made into cellulose for cell wall (structural)
used for respiration
definition of community
all organisms living in a habitat
what’s an ecosystem made up of
all organisms living in a particular habitat and their non living surroundings
interspecific competition?
different species
competing for one or a few of the same resources
intraspecific ?
same species competing for all of the same resources
what’s a niche and what does it relate to
the role an organism plays in an ecosystem
relates to the resources it requires and its interactions between other organisms
name the thing plants can compete for
space, light, nutrients
what can animals compete for
food, mates, habitat
what can be used to take samples of biotic and abiotic factors in a particular area
a transect line
name 4 abiotic factors
pH light intensity temperature soil moisture
name 4 biotic factors
grazing predation disease food availability
