a level biology aqa markscheme
adaptations that maintain high rate of photosynthesis - correct answerlots of
chloroplast=absorb light
light senstive eyespot=detect light
flagellum=enables movement to light
advantage of using natural fertiliser rather than artificial - correct answeracts as soil
conditioner/increases organic content of soil
wider range of elements
production of artificial fertiliser energy consuming
less leaching
advantages of using chemical pesticides to control pests of crops - correct answeracts quickly
can apply to particular area
kills wide variety of pests
anaphase - correct answersister chromatids separate to opposite poles
centromere divides
birth rate - correct answerbirths per thousand per year
cytokinesis - correct answercytoplasm divides produces two new cells
describe cohesion tension theory - correct answerwater lost from leaf due to evaporation in
mesophyll
lowers water potential of mesophyll
, water pulled up xylem creates tension
water molecules cohere using hydrogen bonds
form continuous water column
adhesion of water to walls of xylem
describe how co2 is converted to organic substances during photosynthesis - correct answerco2
combines with RuBP
produces 2 x GP
reduced to TP
using reduced NADP and energy from ATP
TP converted to other organic substances in light independent reaction
describe how crop plants use light energy during light dependent reaction - correct
answerexcites electrons
electrons move along electron transfer chain releasing energy
energy used to join adp and pi to form atp
photolysis of water produces protons electrons and oxygen
nadp reduced by electrons
describe how phagocytic white blood cells destroy bacteria - correct answerattracted to
chemicals in bacteria
engulf bacteria
bacteria in vacuole
lysosomes fuse with vacuole
bacteria hydrolysed
describe how temporary mounts are made - correct answerthin slice
adaptations that maintain high rate of photosynthesis - correct answerlots of
chloroplast=absorb light
light senstive eyespot=detect light
flagellum=enables movement to light
advantage of using natural fertiliser rather than artificial - correct answeracts as soil
conditioner/increases organic content of soil
wider range of elements
production of artificial fertiliser energy consuming
less leaching
advantages of using chemical pesticides to control pests of crops - correct answeracts quickly
can apply to particular area
kills wide variety of pests
anaphase - correct answersister chromatids separate to opposite poles
centromere divides
birth rate - correct answerbirths per thousand per year
cytokinesis - correct answercytoplasm divides produces two new cells
describe cohesion tension theory - correct answerwater lost from leaf due to evaporation in
mesophyll
lowers water potential of mesophyll
, water pulled up xylem creates tension
water molecules cohere using hydrogen bonds
form continuous water column
adhesion of water to walls of xylem
describe how co2 is converted to organic substances during photosynthesis - correct answerco2
combines with RuBP
produces 2 x GP
reduced to TP
using reduced NADP and energy from ATP
TP converted to other organic substances in light independent reaction
describe how crop plants use light energy during light dependent reaction - correct
answerexcites electrons
electrons move along electron transfer chain releasing energy
energy used to join adp and pi to form atp
photolysis of water produces protons electrons and oxygen
nadp reduced by electrons
describe how phagocytic white blood cells destroy bacteria - correct answerattracted to
chemicals in bacteria
engulf bacteria
bacteria in vacuole
lysosomes fuse with vacuole
bacteria hydrolysed
describe how temporary mounts are made - correct answerthin slice
