Download Connect!

Connect!
• Do plants react to their environment?
• How? Give 2 examples.
• Give two examples of animals reacting
to their environments.
• What is the process of adjusting the
internal environment to external
conditions called?
Plants
• Plants have hormones that are produced
by cells which effect the growth and
development of other cells
• Plants do not have specialized organs to
make hormones. However, most hormone
production is found in actively growing
areas such as the tips of roots and stems,
buds, and seeds.
• These
actively
growing
areas are
called
apical
meristems.
• These hormones are involved in
growth, reproduction, and tropisms.
• Auxins are a type of plant hormone
which influence division, elongation, and
differentiation of plant cells.
• Stop and Think!
What do the words division,
elongation, and differentiation mean,
in terms of plant cells?
Unequal distribution of auxins causes
unequal growth responses called tropisms
Unequal auxin distribution can be caused
by external stimuli such as light and
gravity
 Tropisms are adaptive growth responses
that help the plant survive
AUXIN
S
are on
the
DARK
SIDE
• Hormones promote other changes
including flowering, fruit formation, and
seed development…
Chunk!
•
•
•
•
•
Where do plants produce hormones?
What are these areas called??
Name a type of plant hormone.
What is a tropism?
Explain, in detail, why plants bend
toward light.
• What other plant activities are plant
hormones involved in?
Animals
• Differs from chemical control in plants
since animals have endocrine glands
which produce and secrete hormones
• hormones are chemicals secreted in one
area of the body which affect responses in
other areas
• the circulatory system carries these
hormones from the endocrine glands to
target organs
• animals have many hormones that control
activities such as reproduction and
metamorphosis
• Metamorphosis is controlled by hormones.
Chunk!
• How does chemical control differ in
plants and animals?
• What are hormones?
• How do hormones move around in an
animal?
• What is the cell or organ they aim at
called?
• What do tadpoles and caterpillars have
to do with hormones?