Transcript 1-WEEK1-B.ppsx

Plants
•Have
one big disadvantage.
•THEY CAN’T MOVE!
So they must be much smarter than
animals to defend themselves.
 They are! To see them in action, you must
speed up the time.
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Clips shown earlier is from “Planet Erath” series produced
by BBC.  One special shot is my favorite
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5 CD collection is the prize for question
of the week.
More time-lapsed movie of plants
How do they procreate?
Seeds and pollen are the most common
method.
 Both depend on cooperation of wind or
other animals (mostly birds or insects)
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A few strange ways seeds are dispersed.
A murderous tree!
A few interesting plants..
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The spindly orange vine known as dodder is a
parasitic plant.
Time-lapse video reveals that a dodder seedling twirls
through the air, sniffing volatile chemicals released by
neighboring plants in search of a suitable host.
When it finds one, dodder entwines its victim and
inserts nozzles into the host's stem, siphoning of vital
nutrients.
Venus flytrap and Mimosa pudica
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You don’t need time lapsed photography
to see them move.
Recommended:
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2833 Old Gravenstein Highway South
Sebastopol, California 95472
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Alpine buttercups are known for their solar tracking
abilities – their small yellow flowers follow the sun's
daily journey from east to west.
Researchers think that the behavior helps keep the
flowers warm, which boosts chances of pollination
by heat-seeking insects.
Scientists have shown that the buttercup responds
specifically to the blue wavelengths of sunlight.
A small Asian shrub named
the telegraph plant tracks the
sun - not with its blooms, but
with its leaves.
 Small leaflets attached to the
base of larger leaves
constantly swivel to monitor
changing levels of sunlight,
adjusting the position of the
primary leaves as needed.
 The leaves move so quickly
you can see them dance with
the naked eye.
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Irises bloom in the
spring and early
summer.
They know that the
time for flowering has
arrived because they
can sense that the
days are getting
longer and the nights
are getting shorter.
The wild cucumber's
spidering tendrils, which
grab onto fences and
other plants for support,
are super-sensers.
 Most people cannot feel
the weight of a string
weighing less than 0.07
ounces.
 But the tendrils of the
wild cucumber respond
to the touch of a string
weighing only 0.009
ounces and immediately
start twirling around the
tiny thread.
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In lab experiments, researchers have shown
that a weedy beach plant known as sea
rocket recognizes its siblings and restrains its
root growth in their presence.
Contnued..
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When planted near strangers, however,
sea rocket grows as many roots as
possible, since there is no benefit to
helping out an unrelated plant. Sea rocket
probably identifies family based on
chemicals that roots secrete into the soil
Common bread wheat,
also known as “winter
wheat," only flowers and
makes grain following a
cold winter.
 If winter snows do not
blanket the sprouts, they
never flower.
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Continued..
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But if prior to planting, farmers keep the
seeds in the freezer for a while, then the
sprouts will flower even in the absence of
snow.
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In other words, the plants remember
their exposure to the cold.
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Slides from: http://www.scientificamerican.com/slideshow.cfm?id=what-plants-
smell-plant-unusal-talents#1
The largest flower.
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Rafflesia arnoldii or "corpse flower".