Summary
OCR Biology A-Level Plant Responses(2) Summary
A HandWritten summary which contains all the necessary A* Content for Plant Responses at OCR A-Level Biology.
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Phototropism :· Positive tropism In shaded
the shoots auxin will accumulate in the areas ,
elongating
:
the stem it towards the
light
so
grows
Negative tropism
:
In the roots the high auxin illuminated side will
dengate and the root will
grow away from the
light
Geotropism :
Positive tropism Roots grow in the direction of
:
gravity
Negative tropism Shoots
grow away from gravity
:
Commercial use
of plant hormones
·
Ripening
:
Ethere is used to
ripen fruit so it can be transported whilst hard and
unripe
· Powder Auxin production
Rooting stimulates new root
:
Weed and death
Gillers
Synthetic auxin will disrupt cen metabolism cause
:
·Auxins can produce seedless fruit
Ethere can
promote fruit dropping
·
Gibberelling can
delay ripening and
ageing in fruit/make bigger fruit
·Gibberelling cal also
speed up marting
in been
brewing
Cytokinins prevents fruit ageing and control tissue
development in
Micropropogation
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