Transcript Photosynthesis - Life Science with Ms. DeBari

Photosynthesis
Bell Ringer: How do plants
obtain food?
You will be able to…
 Tell
me the products and reactants of
photosynthesis
 Say
in what organelle photosynthesis
occurs
 Explain
adaptations of leaves that make
them suited to carry out photosynthesis
Energy
 Recall
that all living things require energy
 Animals
eat to get energy, but plants
don’t eat. So where do they get their
energy from?
Photosynthesis
 Photosynthesis
is the process through
which plants make their own food (sugar)
from sunlight
 Sunlight
+ Carbon Dioxide + Water 
Sugar + Oxygen
Chloroplasts
 Photosynthesis
takes place in a
special
organelle
called the
chloroplast
Chloroplasts
 Chloroplasts
are found mainly in the
leaves of plants.
 They
contain a pigment called chlorophyll
which is responsible for the green color of
leaves
The Process
 Plants
need Water,
Carbon Dioxide and
Sunlight to perform
photosynthesis
 Sunlight
provides the
energy to split water
molecules and create
sugar
Leaves
 Each
leaf is like a
factory making sugar.
 There
are openings
on the leaf to allow
gases to come in and
out called stomata.
The Leaves
 Veins
send the sugars to the rest of the
plant where it is needed
 Leaves
are often broad and thin- thus
they have lots of surface area for
absorbing sunlight and less volume
BrainPop!
 http://www.brainpop.com/science/cellul
arlifeandgenetics/photosynthesis/
Learning Check
 Can
you…?
1. Tell me the products and reactants of
photosynthesis
2. Say in what organelle photosynthesis
occurs
3. Explain adaptations of leaves that make
them suited to carry out photosynthesis
Cell
Respiration
Bell Ringer: write the
equation for photosynthesis
You will be able to…
1.
2.
3.
4.
Tell me the reactants and products of
cellular respiration
Explain the difference between cell
respiration and photosynthesis
Tell me where cell respiration takes place
Tell me why these processes are
important
Energy
 Most
animals eat. Plants make their own
sugar.
 But…
what do they do with that food?
Cellular Respiration
 Cellular
respiration is the process through
which food is broken down into water and
carbon dioxide to get energy
 Sugar
+ Oxygen  Carbon dioxide
+Water + ATP (Energy)
Cellular Respiration
 ALL
Eukaryotic cells do cellular respiration
(so everything except bacteria)
 Even
plants do cellular respiration (they
do photosynthesis as well!)
Cellular Respiration
 This
occurs in a
special organelle
called the
mitochondria
What’s the difference?
Cellular Respiration
 Provides
energy for
all cells (plant and
animal)
Photosynthesis
 Makes
plants
food for
BrainPop!
 http://www.brainpop.com/science/cellul
arlifeandgenetics/cellularrespiration/
Why does it matter?
 Oxygen
and plants produce that for us
through photosynthesis!
 In
this Wall-E clip, pay attention to the
plant’s role
Wall-E Writing Prompt

Imagine you are writing for the future
generations on board the Axiom ship. They
may not know what plants are, but you do,
and you know they will need some if they are
ever to return to earth.

Write a manual page explaining
photosynthesis and cell respiration, how the
two interact, and why they should try to find a
plant. You may be as creative as you like.