Transcript Slide 1

Science Focus Lesson
SC.3.L.14.1
Plant Structures
Polk County Public Schools
SC.3.L.14.1
Benchmark: Describe structures in plants and their
roles in food production, support, water and
nutrient transport, and reproduction.
Essential Question:
How do the structures of plants support their
roles in food production and reproduction?
Vocabulary:
nutrients
reproduce
leaf
root
flower
seed
stem
Plant Structures
Plant structures are specialized to take care of all the
needs of a plant.
Plant Structures
Roots pull water and nutrients (minerals) from the
ground. They also store extra food.
Plant Structures
Stems transport (move) food and water and provide
the plant with support.
Plant Structures
Leaves undergo photosynthesis. In this process they
use the Sun’s energy to convert carbon dioxide, water
and nutrients into food for the plant. They release
oxygen in the process.
Flowering Plants
Flowers help plants reproduce. Flowers are the parts of
a plant where seeds are made. Seeds produce new
plants.
1. An insect visits the flower.
2. It rubs against the stamens.
3. Pollen sticks to the insect.
4. As the insect explores, some pollen rubs
off onto the pistil.
5. This pollination allows male cells in the pollen
to burrow down into the ovary and join with the
egg there.
6. The fertilized egg develops into a seed!
Flowering Plants
Seeds contain tiny undeveloped plants and a supply of
food for the plant. New plants germinate from seeds
which allows plants to reproduce themselves.
Flowering Plants
Often seeds are contained within fruit. Fruit is
produced from the flower of some plants.
Summarizing
3-2-1
3- Name 3 plant structures
2- Name 2 functions performed by plant
structures
1- Explain how plants reproduce
Plants respond to stimuli
Plant behaviors are inherited (a plant can’t learn!).
Plants respond to a stimulus in their
environment…this response is called a tropism!!
Plants respond to LIGHT!!
If you put a houseplant near a
window, its leaves will turn toward
the sunlight. Plants use the Sun’s
energy to make food into their
leaves. When the leaves turn
toward light, they collect more
energy to make food!
Plants respond to stimuli
Plant behaviors are inherited (a plant can’t learn!).
Plants respond to a stimulus in their
environment…this response is called a tropism!!
Plants respond to Gravity!!
A plant can sense the pull of gravity.
Its roots grow downward, toward the
pull of gravity. Its stems grow upward,
away from the pull of gravity. Roots
growing downward let the plant get
water and nutrients from the soil.
Stems growing upward put the leaves
closer to sunlight so they can make
food for the plant.
Plants respond to stimuli
Plant behaviors are inherited (a plant can’t learn!).
Plants respond to a stimulus in their
environment…this response is called a tropism!!
Plants respond to moisture!!
Plants need water to survive. A
plant’s roots will grow towards
moisture in the soil. If a pond or
stream is nearby, the roots will grow
toward the water.
Summarizing
Write a summary paragraph to describe ways
that plants respond to stimuli. Remember
to have a topic sentence and 3 supporting
sentences.
Guided Instruction:
Work with shoulder partner to answer each question.
1. What is the name of the part of the
root that allows water and minerals
enter?
a.
b.
c.
d.
root hairs
epidermis
phloem
phyla
The answer is
Roots are adaptations for taking
in water and minerals from the
soil. Small hairs coming from
the root allow more area for
water and minerals to be taken
in.
Guided Instruction:
2. Which structures are responsible for
reproduction in plants?
a.
b.
c.
d.
cytoplasm and chloroplast
stamen and pistil
xylem and phloem
sepal and petal
The answer is
Insects pick up pollen from the
stamen. The pollen sticks to the
insect’s body and then rubs off onto
the pistil. This is called pollination
and a seed develops. This is how a
plant reproduces itself.
Guided Instruction:
3. Where does photosynthesis take place in
plants?
a.
b.
c.
d.
phloem
roots
leaves
flowers
The answer is
The leaf contains chloroplasts which
capture the energy from sunlight.
The leaf uses the energy to combine
water (from the roots) and carbon
dioxide (from the leaves) into a kind
of sugar called glucose. Glucose is
the plants food. This process is
called PHOTOSYNTHESIS.
Summarizing
Discuss with your shoulder
partner:
How are a plants structures
important to a plant’s
survival?
Check Your Understanding
Record your answers. Check them at the end.
1. Katie put a flowering plant on her kitchen table.
How would the flowers respond to light coming
through the window?
The flowers would begin to wilt.
b. The flowers would change color.
c. The flowers would lean toward the window.
d. The flowers would open facing away from the window.
a.
Check Your Understanding
2. What might occur if a seed were to be planted
upside down?
the roots would grow up instead of down
b. the stem would grow down
c. the roots would turn so that they were growing down
d. the seed would not grow
a.
Check Your Understanding
3. What might occur if all of the leaves were removed
from a plant
the plant would not be able to support itself
b. the plant would not be able to take in water and
nutrients
c. the plant would not produce seeds
d. the plant would not be able to survive because it could
not make food
a.
Check Your Understanding
4. Which plant structure helps the leaves to reach
toward the sunlight?
roots
b. stem
c. flower
d. fruit
a.
Check Your Answers
1. c-plants turn toward sunlight
2. c-roots grow downward, toward the pull of
gravity
3. d- the leaves of a plant are where
photosynthesis takes place, the production
of food for the plant
4. b- the stem supports the plant which lifts
up the leaves toward the sunlight
Summary Question
A: Tell B which plant structures help
with food production
B: Tell A which plant structures help
with plant reproduction