Photosynthesis Flashcards
Photosynthesis word equation
carbon dioxide + water = glucose + oxygen
photosynthesis reactants
carbon dioxide water light
why are leaves thin?
to allow the gases such as carbon dioxide and oxygen to reach the cells easily.
why are leaves wide and flat?
This creates a large surface area to absorb as much sunlight as possible
what are the veins in a leaf?
they carry water to the cells and carry glucose away.
what are stomata on a leaf?
these are pores on the underside of a leaf through which gases move in and out.
what are the products of photosynthesis?
glucose and oxygen
what is the additional glucose that’s made stored as?
its stored as starch
what do you use to test for the presence of starch?
Iodine is used. if the leaf turns a blue/black colour, starch is present.
what is soda lime
its a chemical that absorbs carbon dioxide
what is sodium hydrogen carbonate
a chemical that produces carbon dioxide
what controls photosynthesis and what sort temperature do they work best in?
enzymes and they work better in high temperatures UNDER 40 degrees Celcius
what happens to the enzymes if it gets too hot?
they breakdown and are denatured
when enzymes denature, what happens to the rate of photosynthesis?
the rate of photosynthesis slows down or stops completely
what are the three limiting factors of photosynthesis?
light carbon dioxide temperature
what are the ideal conditions to maximise the rate of photosynthesis?
Hight light intensity, high concentration of CO2, high temperatures but below 40 degrees
what are the 4 different ways a plant uses glucose that is produced during photosynthesis?
respiration
cellulose
storage
synthesis
respiration uses glucose to…
to produce energy in the mitochondria
lots of glucose molecules join together to form…
to form cellulose that is used to make cell walls
access glucose if stored as…
starch, which can be turned back into glucose when needed
glucose in synthesis is combined with…
is combined with nutrients from the soil to form other compounds such as proteins and chlorophyll
aerobic respiration word equation
glucose + oxygen = carbon dioxide + water
anaerobic respiration word equation
glucose = lactic acid + energy
when does the body have to carry out anaerabic respiration?
when the body cannot supply the cells with enough oxygen to break down glucose
