Photosynthesis in depth Flashcards
what experiment did joseph Priestly perform? what did he discover?
he ran a series of experiments in 1772 with a mouse, candle and a sprig of mint under a sealed jar, showing that “injured air” could be revived by plants.
he discovered oxygen.
what are autotrophs and heterotrophs?
autotrophs produce their own food. heterotrophs must get their food from other organism.
what is the overall reaction of photosynthesis?
the overall reaction is opposite of cellular respiration. 6CO2 + 6H2O + light energy → C6H12O6 + 6O2
what are structural features of chloroplasts?
chloroplasts are double membrane organelles similar to mitochondria. it contains discs called thylakoids stacked forming grana. grana are connected through Lamella. the cytoplasm is called the stroma.
what is electromagnetic radiation? what is the wavelength?
electromagnetic radiation is radiation that has both electric and magnetic fields and travels in waves. this includes radio, microwaves, infrared, x, gamma and visible.
the visible spectrum ranges from 400 to 700 nm with red having the longest and violet having the shortest.
what wavelength is important for photosynthesis?
the most important wavelengths are red (600-700) and blue (400-500) because they are the most effectively absorbed. green is the least absorbed.
What did Jan Ingenhousz and Jean Senebier discover
they discovered that plants produce oxygen in the presence of light
what are the light and dark reactions?
the light reactions take place in the thylakoid. they convert sunlight into ATP and NADH and split H2O and release O2 into the air.
dark reactions occur in the stroma that use ATP and NADH to convert CO2 into the sugar G3P. it also returns ADP and NADP to the light reactions to cycle.
light reactions make oxygen, dark reactions make food.
what does ps-2 do?
light energy enters and excites chlorophyl which release electrons. the electrons are then passed to acceptors through an ETC to the next ps. H2O then splits into protons and releases O2, the electrons from the protons replace the lost electron.
what occurs in ps-1?
the chlorophylls are energized by sunlight energy, causing the loss of an electron, which is replaced by the electron lost in ps-2.
what are the products of ps-1?
lost electrons and NADPH(the carrier)
