Botany - Chapter 27 - Plant Hormones Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
What are hormones? Chemical signals that regulate metabolism,
growth,
and morphogenesis.
What are the five classes of plant Auxins, cytokinins, ethylene, abscisic acid,
hormones? and
gibberellins
What is phototropism? The growth of a plant in response to light.
The Power of Movement in Plants, Records observations and experiments
1881 performed
by Charles and Francis Darwin, notably
over
phototropism.
Frits W. Went, 1926 Isolated auxin from the coleoptile tips of
oat
seedlings.
What is the coleoptile? The sheathlike, protective structure
covering the
shoot of grass seedlings.
, What is the name "auxin" derived The Greek word auxein, meaning "to
from, and what does it mean? increase."
What was Agent Orange? An herbicide made up of synthetic auxins
used to
clear paths through the Vietnam jungle.
What was the result of human Many skin diseases and cancers, as well
exposure to Agent Orange? as birth
defects.
What is the principal naturally Indole-3-acetic acid (IAA)
occurring auxin?
What are the primary sites of auxin Shoot apical meristems and young leaves.
synthesis?
How does auxin production It moves from the tip to the base of the
change leaf.
as a leaf matures?
Aside from shoot tips and young Root apical meristems and developing
leaves, what are other important seeds.
sites
of auxin synthesis?
Where does auxin accumulate The shaded side of stems.
when
exposed to unilateral light?
What does auxin cause in stems? Cell elongation
Questions and Answers with Verified
Solutions | Latest Updated 2026
What are hormones? Chemical signals that regulate metabolism,
growth,
and morphogenesis.
What are the five classes of plant Auxins, cytokinins, ethylene, abscisic acid,
hormones? and
gibberellins
What is phototropism? The growth of a plant in response to light.
The Power of Movement in Plants, Records observations and experiments
1881 performed
by Charles and Francis Darwin, notably
over
phototropism.
Frits W. Went, 1926 Isolated auxin from the coleoptile tips of
oat
seedlings.
What is the coleoptile? The sheathlike, protective structure
covering the
shoot of grass seedlings.
, What is the name "auxin" derived The Greek word auxein, meaning "to
from, and what does it mean? increase."
What was Agent Orange? An herbicide made up of synthetic auxins
used to
clear paths through the Vietnam jungle.
What was the result of human Many skin diseases and cancers, as well
exposure to Agent Orange? as birth
defects.
What is the principal naturally Indole-3-acetic acid (IAA)
occurring auxin?
What are the primary sites of auxin Shoot apical meristems and young leaves.
synthesis?
How does auxin production It moves from the tip to the base of the
change leaf.
as a leaf matures?
Aside from shoot tips and young Root apical meristems and developing
leaves, what are other important seeds.
sites
of auxin synthesis?
Where does auxin accumulate The shaded side of stems.
when
exposed to unilateral light?
What does auxin cause in stems? Cell elongation
