M5 photosynthesis Flashcards
why do plants need energy?
photosynthesis, Active transport, DNA replication, cell division
why do animals need energy?
muscle contraction, maintenance of body temperature, active transport, DNA replication, cell division and protein synthesis
what is the equation for photosynthesis?
6CO2 + 6H20 + energy = C6H6O12 + 6O2
what are the optimum conditions for photosynthesis?
high light intensity of a certain wavelength, absorbing red and blue light in sunlight and reflecting green thus plants are green
temperature around 25 degrees.
carbon dioxide at 0.4%
why are higher temperatures bad for photosynthesis?
stomata closes to avoid water loss, less co2 enters
chlorophyll damaged - reduce amount of pigment being absorbed
membrane around chloroplast damaged - enzymes important in calvin cycle to be released into cell
how does light intensity affect the levels of GP, RUBP AND TP?
in low light intensities, products of light dependant stage (ATP AND REDNADP) are in short supply
the conversion of GP to TP and RuBP is slow
the level of GP rises and the level of TP and RuBP will fall
how does temperature affect the levels of GP, RUBP AND TP?
at low temperatures, enzymes will work slowly
levels of all 3 will fall, this will have the same effect in high temperatures as all reactions in the Calvin cycle are catalysed by ezymes
how does carbon dioxide concentration affect the levels of GP, RUBP AND TP?
at low co2 concentrations, conversion of RuBP to GP is also slow
level of RubP will rise and levels of GP and TP will fall
