Cambridge International AS & A Level Complete Biology
Hi everyone:)) Here are my CIE A2 level Biology topic notes for the syllabus. These notes are tailored to the A level syllabus as well as the mark scheme as if you do enough past paper questions you will see a recurring pattern with the types of questions asked about each topic. My notes include s...
CIE A-level Biology: Classification, Biodiversity and Conservation (A*)
CIE A-level Biology: Selection and Evolution (A* achieved)
CIE A-level Biology: The nervous system (A* achieved)
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→ not
produced in specialised cells within
glands
→
different response in root I shoot
made in tissue
group of chemical substances
→ →
→
produced in
actively growing region eg .
stem →
one direction transport of auxin
→
diffusion 1 AT
•
phloem / xylem
→ Allows permanent cell
elongation to occur
→
effective on
younger cell walls before developing rigidity by secondary thickening
-
① stimulate elongation of Sterns
nnn
② Stimulate growth of lateral and
adventitious roots
↳ at 4) inhibits root growth
③ influences differentiation of an specialised
cells into
xylem /phloem
eg IAA=
Phototropism :
bending of plants towards tight ɱ
Auxins to w/ loner light
'
moves exposure
'
area
:
cells at this side elongate =
bending
auxin w/ no
light ,
q ÷q
avxins are
distributed evenly
elongation
,
growth 9
?⃝
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