paper 1 dont know Flashcards
bright light
inner circular muscles
dim light
outer radial contract
thyroxine too high
detected by hypothalamus
inhibit release of TRH
pituitary stops release of TSH
thyroxine no longer released
return to ideal
animal vs plant stem cells
animals lose differentiation ability young
plants differentiate throughout life
nitrates mineral
causes protein synthesis
nitrates deficiency
no growth and yellow leaves
phosphates mineral
make DNA and cell membrane
phosphates deficiency
no root growth
discoloured
potassium mineral
make rnzymes
potassium deficiency
poor fruit
discoloured
magnesium mineral
make chlorophyll
magnesium deficiency
yellow leaves
alcohol liver damage
breakdown causes toxins
which cause cirrhosis
prevents eggs freezing
antifreeze protein
why raise blood pressure of patients who lose blood
maintain rate of flow of blood
maintain transport of minerals
cholesterol
causes plaque formation in arteries
thyroxine xs vs deficiency
xs - hyperactivity
deficiency - overweight /sluggish
ethene
ripens fruit for sale
gibberellins
ends dormancy
speeds germination
auxin
cell elongation
selective weed killer
ethene use
ripens fruit fast
gibberellins use
speeds up germination
auxin use
selective weed killer
rooting powder
prevents ripe fruit dropping
seedless fruit
xylem vs phloem
xylem = water
phloem = sap - sugar
