Third Grade Science
PLANTS
Table of Contents
Introduction K-W-L
Slide 3
Plant Parts
Slides 4 - 13
Plant Life Cycle
Slides 14 - 23
Plants and the
Environment
Slides 24 - 30
Plant Project
Slides 30-32
K-W-L
 Use the K-W-L chart to brainstorm about
plants.
Plant Parts:
Take a break and observe
the inside of a seed.
Now fill in the parts
of a seed.
PARTS OF A SEED:
Plant Parts:
Take a break and observe
the roots of a plant.
Plant Parts:
Take a break and observe
the stem of a plant.
Plant Parts:
Go to Slides 9 and 10 to learn
about Photosynthesis!
Go to Slide 11 to make a
Photosynthesis factory.
learn about Chlorophyll on
slide 12!
Photosynthesis:
What is photosynthesis? Photo means “light” and synthesis
means “to put together”. Photosynthesis means to put together
with light.
Photosynthesis is a process in which green plants use energy
from the sun to transform water, carbon dioxide, and minerals
into oxygen.
Photosynthesis gives us most of the oxygen we need in order to
breathe.
We, in turn, exhale carbon dioxide that is needed by plants.
Photosynthesis:
Photosynthesis:
Take a break and create a model
of the “Photosynthesis Factory”.
Chlorophyll:
What is chlorophyll? Plants require light as a form of energy
to develop and grow. The way this energy transfer happens is
by using chlorophyll. Chlorophyll is the green pigment in
plants that is used to trap energy from the sun. Each green
part of a plant has chlorophyll. Chlorophyll helps plants absorb
light and convert it into sugar through photosynthesis. It
serves a key purpose in the food chain, not only by making
food for plants, but by creating energy in plants for animals
and humans to eat.
Take a break and do a
Chlorophyll rubbing.
Plant Parts:
Take a break and observe a
Flower.
PLANT LIFE CYCLE
Take a break and actually plant
some seeds so you can observe
the plant life cycle.
Assemble your Seed Observation
Journal.
PLANT LIFE CYCLE
#1
Fill in your sequencing sheet:
1. Plants start out as seeds. A seed is planted in the soil. When it
gets what it needs (water, sunlight, minerals from the soil) it
will germinate.
PLANT LIFE CYCLE:
#2
Fill in your sequencing sheet:
2. From the seed, a tiny new plant, called a seedling, grows. You
will notice roots, a curled stem and very small leaves.
PLANT LIFE CYCLE:
#3
YOUNG ADULT
3. Then roots grow down into the soil and the stem uncurls
upward. leaves get bigger.
PLANT LIFE CYCLE:
#4
ADULT
4. Finally, more leaves grow and blossoms form on the plant.
It is now mature.
PLANT LIFE CYCLE – POLLINATION
PLANT LIFE CYCLE: PARTS OF A FLOWER
PLANT LIFE CYCLE:
What do the flower parts do?
Petals – attract pollinators with their shape, color and smell
Stigma– receives the pollen from a visiting pollinator (female
parts)
Anther – pollen from these will stick to visiting pollinators so
it can be carried to other flowers (male parts, together called stamen)
Filament – holds the anther in place so the pollinator can get to
the pollen (male parts, together called stamen)
Sepal – protects the flower when it’s in the bud
Ovary/Ovules – where the new plant is formed(female parts)
Style – the stalk that supports the stigma
PLANT LIFE CYCLE: PARTS OF A FLOWER
PLANT LIFE CYCLE: PARTS OF A FLOWER
Take a break and view some real photos of parts of a flower.
Take a break and make a fold and learn about the parts
of a flower.
PLANTS AND THE ENVIRONMENT
Check out what each plant part does to help
the environment….
Leaves, twigs, branches…
Leaves, twigs and branches are good at
absorbing sound and block erosion-causing
rainfall. They also provide shade and reduce the
wind speed.
Roots, leaves and trunks…
Roots, leaves and trunks provide habitat for birds,
animals and insects.
Roots…
Roots stabilize the soil and prevent erosion.
Plants…
Plants release oxygen after photosynthesis.
Animals and people need oxygen to breathe.
Fruit and Leaves…
Fruit and leaves provide food for animals and people.
Plants we Eat…
Take a break and brainstorm ideas about the plant parts
we eat. Fill in a sheet with your group.
Plant Project…