Plants Flashcards
Describe the function of cholorophyll [2]
ref. to photosynthesis
transfers light energy into chemical energy
to make glucose
Explain why the rate at which co2 is used in photosynthesis is greater than the rate of co2 uptake
c02 produced in respiration
plants respire all the time
c02 released in dark produced by respiration
c02 released by cells is used in photosynthesis
Explain why some parts of a plant can act as both a source and a sink [2]
acts as a source when it is moving sucose from a source of production
acts as a sink when it is growing a region of utilisation
Explain how palisade mesophyll adapted to function [3]
CELLS tightly packed
many choloroplasts
positioned at top of leaf
Suggest why rate of oxygen production was not the same as the rate of photosynthesis [2]
some oxygen used in respiration
not all oxygen released
some dissolved in water
rate of photosynthesis therefore may appear lower than it actually is
Describe and explain how a reduced conc of water vapour in the air would increase the movement of water through crop plants [3]
increased rate of transpiration
greater conc of water vapour inside than outside
more diffusion
through stomata
more water drawn up through xylem
Define the term gene [2]
length of dna
that codes for a protein
Explain why higher temp=more enzyme activity [3]
more ke
move faster
more collisions
more successful collisions
Define absorption [3]
movement of small food molecules and ions through wall of small intestine
into blood
Explain the advantage of using genetically identical radishes in an investigation [2]
variation of a factor
possible to make comparisons
Plants carry out excretion
yes they do (waste gases)
Suggest the advantages to a plant of wilting
stomata close
to prevent water loss
conserved for other parts of plant
decreases surface area exposed to sun
