auxins and hormones / exam questions With Correct Verified Answers Guaranteed Success.
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Module
HORMONES
Institution
HORMONES
what plant growth substances act synergistically in their effects on cell enlargement? - correct answer cytokinin + auxin
explain how plants leaves
detect changes in lengths of day and night? - correct answer day length detected by phytochrome
2 forms
Pr + Pfr
in light --&g...
what plant growth substances act synergistically in their effects on cell enlargement? - correct answer
cytokinin + auxin
explain how plants leaves
detect changes in lengths of day and night? - correct answer day length detected by phytochrome
2 forms
Pr + Pfr
in light -->
Pr absorbs red-light, converted to Pfr
in dark, far red light
Pfr absorbs --> Pr -->
Pfr ---> Pr --> slow
longer night = > conversion
phytochromes build up according
to light conditions
plant kept in cycle of 12 hours in light and 12 hours darkness do not flower
placed in environment
with 15 hours of light and 9 hours darkness = flowered
explain how change in light condition stimulated this plant to flower? - correct answer phytochrome
, detects day length
exists in 2 forms
Pfr + Pr
photoperiod =
> than 12 hours of light
< than 12 hours of darkness
phytochromes converted to one another
light supplies --> red light --> convert Pr --> Pfr
florigen present
explain why lack of 02 conc,
mean less conc of sugars produced by GIBBERELLINS? - correct answer GIBB ->
produce amylase
enzyme synthesis = ATP
lack of 02, inhibits aerobic, less ATP, less enzymes
less hydrolysis of starch
investigation. determine effect of 02 conc on action of giberelline
explain why necessary to remove embryos from seeds for this investigation? - correct answer -
embryo produces gibberellin
changes conc of gib
IAA bind to transcription factors,
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