auxins and hormones / exam questions With Correct Verified Answers Guaranteed Success.

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, suggest how IAA stimulate cells to synthesis proteins? - correct answer IAA enters cells cytoplasm to nucleus binds to transcription factor at promoter region switching gene form mRNA translation = proteins what plant chemical promote root formation? what promotes cell elongation? - correct answer auxin A + gibberellin how plant hormones travel to target organs? - correct answer plasmodesmata 3 similarities between IAA and animal hormones ? - correct answer chemicals produced in cells move away from site of production long term effects control growth gene activation auxins stimulate weeds to grow rapidly but not grass suggest explanation? - correct answer weeds sensitive take up auxin affected more cell elongation student investigated effect of natural IAA + artificial IAA]on shoot: one side shoot containing agar with either IAA describe suitable control for this investigation? concluded that both IAA affected growth artificial IAA effect than natural IAA on other side of shoot, suggest how recorded? and explain how IAA in agar affected shoot? - correct answer agar block with no IAA both sides of shoot with auxin taller than control with no auxin IAA diffuses out agar -- zone of elongation -- where cell elongation happens H+ ions artificial more effective shoot bends away from artificial IAA to right shoot growth on left side of artificial IAA explain how present of