photosynthesis Flashcards
here is a food chain:
grass → deer →tiger
a) which of these organisms are producers
b) which of these organisms are consumers
a) the grass
b) the deer and tiger
here is a food chain:
hydrangea → aphid → ladybird → blue tit
which is the
a) carnivore
b) herbivore
c) producer
d) tertiary consumer
a) ladybird, blue tit
b) aphid
c) hydrangea
d) blue tit
define a food web
a diagram showing the interlinked food chains of an ecosystem
why do you rarely have more than 4 animals on a food chain
there is insufficient energy
how do you use a pooter and what are they useful for catching
suck the mouthpiece to draw insects into the holding tube
used to catch small insects
julia wants to sample insects in a tree. what method would she use and how does it work
tree beating. you shake/ beat vegitation and catch the falling insects in a cloth held underneath
julia wants to sample insects in her local stream. name TWO methods she could use and how they work
kick sampling: kick the bank of the stream and hold a net down stream to catch insects that have been swept by the current
sweep nets: usually used for long grass but can be used for ponds. sweep a net to catch invertibrates
how does a pitfall trap work
dig a small hole and cover with leaves so insects fall in
describe photosynthesis
the conversion of carbon dioxide and water into glucose and oxygen
what do plants use glucose for
producing biomass, cellulose production
what makes leaves green
chlorophyll
what part of a plant takes in
a) carbon dioxide
b) water
a) the stomata in the leaves
b) the roots
what 4 things are necessary for photosynthesis to occur
light energy, carbon dioxide, water, chlorophyll
what does chlorophyll do
absorbs sunlight and uses the energy for photosynthesis
what 2 things are produced from photosynthesis
glucose and oxygen
name 2 adaptations of a leaf that help with photosynthesis
green colour→ contains chlorophyll molecules to absorb
light energy
large surface area→ absorbing as much light energy as possible
name 4 minerals that plants require to keep healthy + their purpose
nitrogen→ making leaves
phosphorus→ making roots
magnesium→ making chlorophyll
potassium→ making fruit and flowers
what tests can you run to check if a plant is photosynthesising
it is green
contains glucose in the form of starch→ test with iodine
describe the method of testing for starch in a plant
- collect your sample leaves
- place the leave in a beaker with boiling water and hold it for 5 mins with forceps
- put the leaf into a boiling tube
4 submerge the leaf in ethanol and put the boiling tube in the hot water. after a while the ethanol should turn green. this means the chlorophyl is present
5.rinse the leaf in the beaker of hot water
6.put the leaf in a petri dish and add iodine - if the leaf turns blue/ black then starch is present
why is the presence of starch in a leaf linked to photosynthesis
the plant stores the glucose produced during photosynthesis as starch for later use
define bioaccumulation
when a toxic substance is spread faster than it is being destroyed
define an indicator species
an organism that can be used to infer conditions of a particular habitat
name 3 characteristics of clean water
usually clear
high oxygen levels
indicator species present
high diversity in species
what is lichen an example of
what does it show
an indicator species
the air quality of a place
where in a leaf does photosynthesis take place
chloroplast
julia has a leaf. the rim of the leaf is white and the middle of the leaf is green. she tests it for starch with iodine. what colour would the
a)white
b) green
part be and why
green= blue black. the green contains chloroplast so it is able to produce glucose in photosynthesis
white= orange. the iodine doesn’t react so it is just stained orange, proving that the white part doesn’t have glucose.
