Biology Questions and Answers
gibberellins. Gibberellins are made in
the apical buds and in young leaves.
- What are cytokinins?
Where are they made?
Cytokinithe promotion ns are phytohormones active inof cellular division, they
slow down the aging of tissues and act
together with agrowth. Cytokinins are uxins stimulating plaproduced by thent (^)
root meristem and distributed through
the xylem.
- What is the plant hormone
remarkable for stimulating
flowering and fruit ripening?
What are the uses and
practical inconveniences of
that hormone?
The plant hstimulating aormone notable fornd accelerating fruit (^)
ripening is the gas ethylene (ethene).By being a gas, ethylene acts not only (^)
in the plant that produces it but also in
neighboring ones.
Some fruit processing industries use
ethylene to accelerate fthe other hand, if the intensification orruit ripening. On
acceleration of fruit ripening is not
desirablthe mixture care me of ripe fruits that releaseust be taken to prevent
ethylene with the others.
- Are the development and
growth of plants only
influenced by plant hormones?
Physicalfactors, like and chemicalintensity and position environmentalof
light in relation to tgravitational force, temperature,he plant, (^)
mechanical pressures and chemical
composition of atmosphere, can also ithe soil and of thenfluence the (^)
growth and development of plants.
- What are plant tropisms?
Tropismsexternal stimulus. I are movemn Botanyents cause the studiedd by (^)
plant tropisms are: phototropism
(tropism in response to ligeotropism (tropism in response ght), (^) to the
earth gravity) and thigmotropism
(tropism in response to mstimulus). echanical
- To which direction does
the growth of one side of a
stem, branch or root induce
the structure to curve?
Whenever one side of a stem, branch or
root grows more than the other side thestructure curves towards the side that
grows less. (This is an important
concept for plant tropism problems.) - What is phototropism?
Phototropismstructures in response to lig is the movement of plantht.
Phototropism may be positive or
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