photosynthesis ( key area 3) Flashcards
what is the 1st stage (light reaction stage) of photosynthesis
the light energy from the sun is trapped by chlorophyll in the chloroplasts and is converted into chemical energy which is used to generate the energy transfer molecule atp, water is split to produce hydrogen and oxygen. Oxygen diffuses from the cell.
what is the 2nd stage (carbon fixation stage) of photosynthesis
carbon fixation is a series of enzyme controlled reactions which use hydrogen and ATP (produced by the light reaction) with carbon dioxide to produce sugar e.g. glucose.
what is a producer and how are they related to photosynthesis?
green plants are called producers. Producers make food by photosynthesis
where does photosynthesis take place?
Photosynthesis takes place in chloroplasts, chloroplasts contain the green chemical / molecule called chlorophyll which absorbs light energy for the photosynthesis reactions to take place.
what is the word equation for photosynthesis?
carbon dioxide + water
light energy
>
chlorophyll
glucose + oxygen
what is the energy change during photosynthesis?
light energy is converted into chemical energy
why are carbon dioxide and water important in photosynthesis?
they are raw materials
why are light energy and chlorophyll important in photosynthesis?
they are requirements
why are glucose (chemical energy in food)+ oxygen important in photosynthesis?
they are products
what are the 6 key things in a plant cell ( LOOK AT JOTTER)
Vacuole, cell wall, cell membrane, nucleus cytoplasm, chloroplasts
what are 3 environmental factors that can affect photosynthesis?
light intensity,
carbon dioxide concentration,
temperature
what colour does iodine go when starch is present?
black/blue
what is a limiting factor?
a limiting factor is a factor that holds up a process when it’s in short supply
what is the chemical energy in sugar used for?/
Fate of glucose produced during photosynthesis
the chemical energy in sugar is available for respiration or the sugar can be converted into other substances such as starch (storage) and cellulose (structural
