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7th Grade PSI
Matter and Energy in
Everyday Life
www.njctl.org
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Table of Contents
Click on the topic to go to that section
· Photosynthesis
Photosynthesis
· Photosynthesis Formula Game
· Cellular Respiration
· Matter and Energy Flow
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of Contents
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Energy for Life
Energy for Life
Where do you think all
organisms on Earth get their
energy?
Do different organisms get
energy from different places or
do all organisms get energy
from the same place?
Brainstorm at your table.
All organisms get their energy
from the sun!
How is this possible though?
Isn't this giraffe getting its
energy from the tree he is
eating?
Brainstorm at your table.
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Photosynthesis
Photosynthesis
Many living things can perform photosynthesis:
The sun's energy cannot be used by cells without some help.
Photosynthesis is the
process that
makes the energy of
sunlight usable for
all living things.
How do plants get the
energy from the sun?
Once you have come up
with an idea, move the
picture for the answer.
Bacteria
Plants
Algae
Are there any animals who perform photosynthesis?
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Where does the energy for life come from?
B The Sun
C Food
Complete Lab assignment according to teacher directions.
D Fossil Fuels
Check out this video about photosynthesis.
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Chemicals involved in Photosynthesis
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Chemicals involved in Photosynthesis
Water: H2O
In addition to food, what do
plants provide to us which
we (and the fish in this
picture) need?
Carbon Dioxide: CO2
Oxygen: O2
Glucose: C6H12O6
Glucose is sugar, a complex carbohydrate containing carbon. The
individual molecules of Carbon, Hydrogen and Oxygen are joined
together to make this molecule.
Teacher Note
Photosynthesis Discovery Lab
A Earth
Answer
1
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2
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Plant Cell Review
What chemical is not part of the photosynthesis
process?
In the last chapter, we learned about cells and organelles.
A carbon dioxide
Answer
B water
C glucose
D carbon monoxide
At your table, think back and come
up with a list of some cell
characteristics and organelles
which are specific to plants alone.
E oxygen
Be ready to give an example to the class!
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Reactants for Photosynthesis
3 Which of the following are used in Photosynthesis?
(select all that apply)
Photosynthesis occurs mainly in the leaves of plants and in the
chloroplasts.
A Sunlight
C Hydrogen
D Carbon Dioxide
The roots collect water and the
stomata of the leaves collect
CO2. These two materials are
called the reactants.
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Photosynthesis is a multi-step process
4 Which plant parts are used in the collection of raw
materials for photosynthesis?
Step 1: Collection of raw materials (sunlight energy, water,
carbon dioxide). Step 1 is called the light dependent reactions.
C leaves and nucleus
D chloroplast and stomata
Answer
A chloroplast and endoplasmic reticulum
B mitochondria and golgi body
Answer
B Water
The pigment chlorophyll, which
makes leaves green and is found
inside the chloroplasts, collects
the energy of sunlight.
Step 2: Processing of the raw materials to form glucose and
oxygen. This step is called the Calvin Cycle, which is also
known as the light independent or dark reactions.
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The Calvin Cycle occurs when the molecules of carbon dioxide and
water are taken apart, rearranged and recombined using the
energy in sunlight to make glucose and oxygen.
5 What is the name of the cycle that is also known as
the light independent reactions?
A Calvin Cycle
Answer
The Calvin Cycle
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B Photosynthesis Cycle
C Hobbes Cycle
The Calvin Cycle is named for
Melvin Calvin, who in 1937
alongside his colleagues at the
University of California, discovered
the process.
D Respiration Cycle
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Why is the Calvin Cycle also
called the Dark Reaction?
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Equation for Photosynthesis
Drag and drop the reactants and products into the correct
place in the equation.
______ + _____
Water
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Equation for Photosynthesis
Glucose
_______ + ______
Carbon
Dioxide
Oxygen
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Photosynthesis Formula Game
The process can be simplified into the following equation:
6CO2 + 6H2O
sunlight
C6H12O2 + 6O2
The equation above contains 6 carbon molecules, 12 hydrogen
molecules, and 18 molecules in both the reactants and products.
They have just been regrouped into different compounds.
Learn more about
photosynthesis and formulas
by playing this game.
Teacher Note
It is not really dark!
It can happen anytime
of the day, but does
not require light to
work.
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Contents
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6 What are the products of Photosynthesis?
Overall Idea: Photosynthesis
A Water and Carbon Dioxide
C Carbon Dioxide and Glucose
D Water and Oxygen
Glucose is used by the cell immediately or stored for growth
Answer
B Glucose and Oxygen
or later use. The oxygen is released as a waste product, it leaves
through the stomata.
This is good news because humans and many other animals rely
on this oxygen!
The process of Photosynthesis has stored the energy of
sunlight for later use!
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Set Sail for the Island of
Photosynthesis Project
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Cellular
Respiration
Please use lab sheets to complete this assignment.
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Contents
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Photosynthesis and Cellular Respiration
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Cellular Respiration
Human and other animals do not photosynthesize. Instead, our
cells perform a process called Cellular Respiration
Photosynthesis and respiration have a special relationship.
In animals, breathing is also known as respiration. Our cells
also need to breathe. What do you think the relationship
between photosynthesis and respiration is?
This happens in the
mitochondria and the
cytoplasm.
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Photosynthesis vs. Cellular Respiration
In photosynthesis, plants take in water and carbon dioxide and
produce glucose and oxygen.
In order for cellular respiration to
occur, cells need to take in this
glucose (sugar), which is collected
through food.
Glucose (food)
The cells also need this oxygen,
which is collected by lungs, gills, or
other similar structures.
Oxygen
Cellular Respiration
Our cells turn these reactants into water and carbon dioxide, which
coincidentally is needed by photosynthetic organisms!
In this process, our cells
also release energy. This
means that cellular
respiration is an
exothermic reaction.
H
O
water
H
Glucose (food)
C
O
O
Carbon Dioxide
Oxygen
Energy
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Equation for Cellular Respiration
Equation for Cellular Respiration
Drag and drop the reactants and products into the correct
place in the equation.
C6H12O6 + 6O2
____ + _____
_____ + _____+ _____
6CO2 + 6H2O + ATP
This equation has 18 molecules of oxygen, 12 molecules of
hydrogen and 6 molecules of carbon on both sides of the equation.
ATP, or adenosine triphosphate, is the source of power in the cell.
Water
Energy
Glucose
Carbon
Dioxide
Oxygen
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Cellular Respiration Molecular
Model Activity
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How does the formula for Cellular
respiration relate to the formula for
Photosynthesis?
Work together with your game boards from the Photosynthesis
Formula game to complete the Venn Diagram in your class
work section.
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Photosynthesis and Cellular Respiration
Relationship
Fill in the blanks
Photosynthesis
Plants Produce:
_______ and oxygen
These two processes are opposites.
________ and
Water
________ Cell
The products of one are the raw materials of the other.
_________ Cell
_____________ _____________
Photosynthesis produces glucose and oxygen, which are
then used by Cellular Respiration to release energy, carbon
dioxide and water.
Animals Produce:
Carbon Dioxide and _______
Animals Use
glucose and
Cellular Respiration
________
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What is the relationship between Photosynthesis
and Cellular Respiration?
A There is no relationship
B They are identical
C They are very similar, but not identical
Answer
7
Plants Use:
Matter and Energy Flow
D They are opposite processes
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of Contents
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Matter and Energy Flow
Now that we know how
Photosynthesis
and Respiration work
together, let's think
about how this system
flows...
Complete the chart below
_____________
Photosynthesis
Cellular Respiration
Energy
STORED
Glucose
and
Oxygen
RELEASED
______________
Energy,
Water and
Carbon
Dioxide
RELEASED
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Draw your own
8 How does energy flow through the cycle of
Photosynthesis and Cellular Respiration?
Chart of matter and energy flow
B Energy is stored by Photosynthesis and released
by Cellular Respiration
C Energy is released by Photosynthesis and stored
by Cellular Respiration
D Energy is released by Photosynthesis and Cellular
Respiration
Answer
A Energy is stored and never released
Include:
All materials and the amounts of each
A plant
An animal
All terms
Where energy is stored
Where energy is released/ reused