biology Flashcards
how many stages are there in photosynthesis?
two
whats stage one of photosynthesis called?
light dependent
whats stage two of photosynthesis called?
carbon fixation
explain cardon fixation in a diagram
hydrogen + carbon dioxide–glucose (sugar)
definition of photosynthesis
green plants produce sugar using light energy
whats an ecosystem?
natural biological unit composed of habitat, population and communities
what is niche?
an organism niche is the role that it plays in its community Needs-(eg. nutrients, light)
reasons for removal of a species from an ecosystem
ph
river flow rate
disease
whats INTERspecific competition
the same competition between DIFFERENT species, occurs when individuals of DIFFERENT species require SIMILAR recourses in an ecosystem
what is INTRAspecific competition
individuals of the SAME species need the SAME resources therefor competition is MORE INTENSE than INTERspecific competition
what is an abiotic factor
non-living part of an ecosystem that shaped its environment
what is a biotic factor?
any living factor may affect abundance of different species in an ecosystem
give an example of an abiotic factor
temperature
light
water
air
soil
give an example of a biotic factor
disease
grazing
predation
competition
definition of population
group of organisms of the same species
