topic 6 plants and their structues Flashcards
what is photosynthesis?
to use the energy from the sun too make glucose
what is biomass ?
mass of living material
where does photosynthesis happen ?
chloroplast
why does photosynthesis happen in the chloroplast
the chlorophyll absorbs light
what is the word equation of photosynthesis ?
carbon dioxide + water –> glucose
+ oxygen
what is the symbol equation for photosynthesis
6CO2 + 6H2O –> C6H12O + 6O2
what kind of reaction is photosynthesis
endothermic
what are the limiting factors for photosynthesis ?
light intensity, carbon dioxide concentration, temperature
describe the core practical for photosynthesis
set a light a measured distance from Canadian pondweed in water mixed with sodium hydrogen carbonate with a gas syringe. set a timer for a set time and the syringe should fill with oxygen. measure that.
How do we control the control variables?
to keep the temperature the same put it in a water bath, to control the co2 put the same amount of sodium hydrogen carbonate in water in every experiment
what are hair cells on roothair cells?
cells on the surface that have grown
why do roothair cells what large surface area?
to absorb more water and mineral ions
what are phloem tubes made from?
columns of elongated living cells with small pores in the end walls to allow stuff to flow through
what do phloem tubes transport?
food substances for immdeiate use
what is the transportation of food substances known as?
translocation and it goes in both directions
what are xylem tubes made of?
dead cells joined end to end with no end between them and a hole down the middle.
what is the material that strengthens the xylem called?
lignin
what do the xylem carry?
water and mineral ions from the roots to the stems and leaves.
what is the movement of water from the roots and through the xylem and out the leaves called
transpiration stream
what are stomatas?
tiny pores on the surface of the plant
what do the stomata do?
allowed co2 and o2 to diffuse directly in and out of leaves and allow water vapour to escape during trqnspiration
what are stomata?
tiny pores on the surface of the plant
what do the stomata do?
allowed co2 and o2 to diffuse directly in and out of leaves and allow water vapor to escape during transpiration
what do the stomata do?
allowed co2 and o2 to diffuse directly in and out of leaves and allow water vapor to escape during transpiration
