Chapter 2 science powerpoint

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Transcript Chapter 2 science powerpoint

Energy from Plants
Chapter 2
Lesson 1
What are the plants’ characteristics?
• Plants are made up of many cells.
• These cells all do different jobs in the plant
• Plants have special cells they use to absorb
water and nutrients from the soil
• Plants contain Chlorophyll, which makes them
green
How Plants Make Food
• Photosynthesis – The
process of making
sugar
• Plants use sugar as
food
• Carbon dioxide is
absorbed from the air,
water is absorbed
from the soil, and
chloroplasts trap the
sunlight
PHOTOSYNTHESIS
• The plant uses the
sugars it makes
• The plant releases
Oxygen that we
breathe
Chloroplasts
Photosynthesis Song
Edublogs.tv Photosynthesis
Song
Parts of a Plant
Stems
• Can be as thick as a tree trunk
or as thin as a blade of grass
• Have 2 major functions
– 1. carry water, minerals and food between
the roots and leaves
– 2. Support the plant, holding up the leaves so
they can get sunlight
Roots
• Anchor or hold the plant to the ground
• Absorb or take in water and mineral
nutrients from the soil
• Fibrous Roots
– Grow away from the plant in search of water
• Taproots
– Has a large main root, called the taproot.
– It grows straight down
– Stores food for the plant
How Plants Reproduce
• Petals-colorful outer layer
of flowers that help
protect the insides that
make new plants
• Sepals- the small, green
leaves below the petals.
They cover and protect
the flower as it grows
inside the bud
How Plants Reproduce
• Pistil-small knoblike
structures in the
middle of the plant
• Stamens-smaller
stalks surrounding the
pistil. Pollen is made
here.
How Do Plants Reproduce?
Pollen on the Move
• Pollen has to move from the
stamen to a pistil in order for a
seed to form.
• HOW CAN THIS HAPPEN???
• Animals help this happen!
• Animals are attracted by the
colors of the petals and to eat
the nectar deep inside the
flower.
• Pollen from the stamen is
rubbed off onto the animals
body
• The pollen is then rubbed off
onto the pistil of the next flower
the animal visits.
Pollen in the Move
• Wind also can blow
pollen from the
stamen of one plant
to the pistil of another
• After the fertilization,
the flower begins to
dry up and fall off
• A seed develops
inside
How a Plant Grows from a Seed
Life Cycle of a Plant
Seeds on the Move
• Seeds have to move away from each
other to have room to grow.
• If they grew too close to one another they
would compete for water, nutrients from
the soil, and sunlight.
Animal Helpers
• Animals eat fruit and when they do they
eat the seeds also.
• The seed will pass through the digestive
system onto the ground in the animal’s
droppings.
• The animal will usually carry the seeds far
from the adult plant so this helps scatter
the seeds
Wind as a Helper
• Many seeds have wing-shaped seeds to
carry them far from the adult plant.
• When the seeds land, many are buried
and new plants grow
Water as a Helper
• Water can carry seeds from one location
to another.
• Coconut seeds can float from one island to
another and create new trees.
New Plants from Plant Parts
• Some plants grow from
stems, roots, or leaves
• Bulbs are underground
stems that grow into new
plants
• Potato plants sprout new
plants right from the
potato