Topic: Plants
Aim: Describe the role of tropisms in plants.
Do Now: Evolution and Plant review
HW: Define: ecology, ecosystem, biotic
factors, abiotic factors, population,
community, producers, consumers,
herbivores, carnivores, predators,
scavengers, omnivores, decomposers,
habitat, niche
Food chain reading notes due Tuesday
CL Evolution due Wednesday.
The diagram above shows a series of bone structures in
four different species of vertebrates.
1. What are these structures called?Homologous structures
2. Explain how these structures support the theory of organic
evolution.
Because these species have similar structures, they may
have evolved from a common ancestor.
1. Identify the common ancestor. A
2. Identify the species that are NOT
extinct. Explain why they are still
present.
J, K, M
They had favorable adaptations
that enabled them to adapt to
their environment.
3. Identify a species that has
become extinct and explain why.
O, P, H, C, D
There was no variation
within the species.
4. Which part of Darwin’s theory
does this diagram represent?
Support your answer. Speciation
One species evolved into
many species over time.
PHOTOSYNTHESIS
Energy is stored.
AEROBIC RESPIRATION
Energy is released.
H2O and CO2 are raw materials C6H12O6 and O2 are raw materials
C6H12O6 and O2 are products H2O and CO2 are products
Takes place in chloroplasts
Takes place in mitochondria
1. The substance in green plants that captures
Chlorophyll
the sun’s energy is _____.
2. The process in which light energy is converted
photosynthesis
into chemical energy is known as ____.
3. A process in which glucose is broken down to
Cellular respiration
release energy is called ___.
4. The plant structure that absorbs water and
roots
minerals from the soil are _____.
5. The tissue found in stems and leaves that
transport materials throughout the plant is called
vascular
_______ tissue.
and
1. The raw materials of photosynthesis are CO2
_____.
and H2O
2. The vascular tissue that transports water up from
xylem
the roots to the leaves is _____.
autotrophs
3. Plants that use photosynthesis are ______.
4. The source of energy for photosynthesis is sunlight
_____.
5. The vascular tissue that transport food throughout
the plant is called _______.
phloem
6. The “chemical energy” produced during
glucose
photosynthesis is _______.
oxygen
7. The waste gas released by plants is ____.
8. In a plant, photosynthesis occurs in leaves
_____.
9. The wavelengths of light that are most effective
red and blue
for photosynthesis are _________________.
1. Identify
some
external
stimuli
that
plants
respond
to.
• Tough, light gravity
2. Describe • Movement caused by a
tropisms.
change in growth
3. Describe • Negative: plant grows away
the
from stimulus
difference • Positive: plant grows
between a towards the stimulus
negative
and
positive
tropism.
4. Describe
how plants
respond to
the
following
stimuli:
What is the
external
stimulus for
this plant
response?
What is
the
external
stimulus
for this
plant
response?
a. Touch • Plant bends and twists around
any object it touches
• Thigmotropism
• Positive tropism
http://www.youtube.com/watch?v=_SIJ4ov_FxA
What is
the
external
stimulus
for this
plant
response?
b. Light
• Plant bends toward light
• Phototropism
• Positive tropism
What is
the
external
stimulus
for this
plant
response?
• Roots grow downwards
c.
Gravity • Stems grow upwards
• Gravitropism or Geotropism
• Roots - Positive tropism
• Stems - Negative tropism
http://bcs.whfreeman.com/thelifewire/content/chp38/3802001.html
http://www.youtube.com/watch?v=F3Oj2er-91s&feature=related
What is
the
external
stimulus
for this
plant
response?
d.
Water
• Hydrotropism
• Plant grows towards water
• Positive
• Plant hormones that causes
5.
Describe plants to respond to stimuli.
Tips covered
auxins.
Tips were
removed
Observe the diagram above. In which
part of the plant are auxins
produced?
6.
•
Identify
the
•
kind of
responses
regulated
by auxins.
Development of flowers,
roots and fruits
Control production of other
plant hormones.
• Auxin levels increase in cells of
7.
shaded area.
Observe
•
Causes
greater
elongation
of
cells
Figure 12
which results in the bending of
on p. 314.
the plant.
Describe
how
auxins
cause
plants to
bend
towards
the light.
Let’s summarize….
1. Describe tropisms.
2. What are some examples of external
stimuli that cause tropisms?
3. Explain phototropism.
4. Explain geotropism.
5. Explain thigmotropism.
6. Explain hydrotropism
Plant substances that affect
plant growth are called
1. tropisms
2. glucose
3. germination
4. hormones
Plant response to a stimulus is
called
1. photosynthesis
2. transpiration
3. tropism
4. locomotion
An example of a negative tropism is
1. stems growing up and away from
gravity
2. plants bending towards light
3. roots growing down towards gravity
4. Plants growing towards a water
source
1. What part of Darwin’s Theory of Natural
Selection is this diagram representing?
Variation
2. Which has the favorable adaptation? Support
your answer.
Medium mice. They have the greatest
population.
Identify The parts to Darwin’s Theory of
Natural Selection.
1.Differences among the organisms within a species
exists. Variation
2.A species produces more offspring than can
actually survive. Overproduction
3.Organisms will struggle with each other for limited
resources. Competition
4.Overtime, a species can evolve into different
species. Speciation
5.Organisms that are most fit will survive, reproduce
and pass on the trait to offspring.
Survival of the fittest
According to one theory, similarities in these
embryos suggest common ancestry. As these
embryos mature, they will most likely
(1.) develop new organs according to the
nutritional requirements of each organism
(2.) show no similarity as adults
(3.) continue to closely resemble each other as
adults
(4.) develop the distinctive characteristics of their
species
According to Charles Darwin, one factor
that affects the evolution of a species is
(1.) variation due to genetic mutations
(2.) rapid fossil formation
(3.) survival of the fittest
(4.) exposure to environmental pollutants
Which of the following is most likely to
cause an organism to become extinct?
1.A mutation develops.
2.The major change in the environment
occurs and organisms cannot adapt.
3.DNA is not readily passed on to
offspring .
4.Malnutrition occurs over an organism’s
lifetime.