Biology Questions and Answers
- Where in plants is a large
amount of IAA found?
Auxins are produced and found in large
amount in and shoots and in the young leaves.the apical buds of the stem
- How do phytohormones
help the development of
parthenocarpic fruits?
Parthenocarpic fwithout fecundation. Somruits are those producede plants
naturally make parthenocarpic fruits,
like the banana tree, stimulated bown hormones. y their
Angiosperms that do not naturallyproduce parthenocarpic fruits may do it (^)
if auxins arfecundation. Te applied to flowers bherefore even witheforeout
fecundation the ovaries grow and fruits
are formed although seedless.
- How do auxins act helping
the lateral (secondary)
growth of the stem?
Auxins stimulate the formation of
conductive vpromoting the thickeniessels, xylem and phloem,ng of the stem.
- What happens when the
auxin concentration in some
structures of the plant is over
the action range of the
hormone?
In some parts of the plant (stem, roots,lateral bconcentration rauds) there are auxinnges in which th (^) e
hormonal action is positive (stimulate
growth). concentrations ovIt is observeer the superior d that (^) limit of
those ranges have the opposite effect
(inhibition of growth).
- What is the phenomenon
of apical dominance in plants?
How can it be artificially
eliminated?
Apical dominance is the phenomenon
through which hirange limit) auxin cogh (over the positivencentrations due to (^)
auxins from the apical bud moving
downwarof the lateral bd the stem iuds of the plant. At thenhibit the growth
beginning of the stem development the
apical dominance causes thgrowth to be longitudinal (upwards)e plant (^)
since the growth of the lateral buds
remains inbecome more distant fhibited. As the lateral budsrom the apex the (^)
auxin conclowers and shoots grow more easily.entration in these buds
The growth ofstimulated preventin tree branches can g the apical be
dominance through the removal of the
apical bud.
- What are gibberellins?
Where are they produced?
Gibberellins are plant hstimulate plant growth, flowormones thatering and (^)
fruit formation (also parthenocarpy) and
the germinatiomore than 70 known types ofn of seeds. There are
http://www.biology-questions-and-answers.com