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7th Grade PSI

Matter and Energy in Everyday Life

www.njctl.org

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Table of Contents

· Photosynthesis· Photosynthesis Formula Game

· Cellular Respiration· Matter and Energy Flow

Click on the topic to go to that section

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Photosynthesis

Return to Table of Contents

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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.

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Energy for Life

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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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.

Photosynthesis

How do plants get the energy from the sun?

Once you have come up with an idea, move the picture for the answer.

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Are there any animals who perform photosynthesis?

Plants Bacteria Algae

Many living things can perform photosynthesis:

Photosynthesis

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1 Where does the energy for life come from?

A Earth

B The Sun

C Food

D Fossil Fuels

Ans

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Photosynthesis Discovery Lab

Complete Lab assignment according to teacher directions.

Check out this video about photosynthesis.

Teac

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ote

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In addition to food, what do plants provide to us which

we (and the fish in this picture) need?

Chemicals involved in Photosynthesis

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Water: H2O

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.

Chemicals involved in Photosynthesis

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2 What chemical is not part of the photosynthesis process?A carbon dioxide

B water

C glucose

D carbon monoxide

E oxygen

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Plant Cell Review

In the last chapter, we learned about cells and organelles.

At your table, think back and come up with a list of some cell

characteristics and organelles which are specific to plants alone.

Be ready to give an example to the class!

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The pigment chlorophyll, which makes leaves green and is found inside the chloroplasts, collects

the energy of sunlight.

The roots collect water and the stomata of the leaves collect

CO2. These two materials are called the reactants.

Reactants for PhotosynthesisPhotosynthesis occurs mainly in the leaves of plants and in the

chloroplasts.

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3 Which of the following are used in Photosynthesis? (select all that apply)

A Sunlight

B Water

C Hydrogen

D Carbon Dioxide

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4 Which plant parts are used in the collection of raw materials for photosynthesis?

A chloroplast and endoplasmic reticulum

B mitochondria and golgi body

C leaves and nucleus

D chloroplast and stomata

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Step 1: Collection of raw materials (sunlight energy, water, carbon dioxide). Step 1 is called the light dependent reactions.

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.

Photosynthesis is a multi-step process

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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.

The Calvin Cycle

The Calvin Cycle is named for Melvin Calvin, who in 1937 alongside his colleagues at the University of California, discovered the process.

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5 What is the name of the cycle that is also known as the light independent reactions?

A Calvin Cycle

B Photosynthesis Cycle

C Hobbes Cycle

D Respiration Cycle

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Why is the Calvin Cycle also called the Dark Reaction?

It is not really dark! It can happen anytime

of the day, but does not require light to

work.

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______ + _____ _______ + ______

Equation for Photosynthesis

Drag and drop the reactants and products into the correct place in the equation.

Carbon

DioxideWater Glucose Oxygen

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The process can be simplified into the following equation:

6CO2 + 6H2O C6H12O2 + 6O2sunlight

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.

Equation for Photosynthesis

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Photosynthesis Formula Game

Learn more about photosynthesis and formulas

by playing this game.

Return to Table of Contents

Teac

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6 What are the products of Photosynthesis?

A Water and Carbon Dioxide

B Glucose and Oxygen

C Carbon Dioxide and Glucose

D Water and Oxygen

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The process of Photosynthesis has stored the energy of sunlight for later use!

Overall Idea: Photosynthesis

Glucose is used by the cell immediately or stored for growth 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!

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Set Sail for the Island of Photosynthesis Project

Please use lab sheets to complete this assignment.

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Cellular Respiration

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Photosynthesis and respiration have a special relationship.

Photosynthesis and Cellular Respiration

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?

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Human and other animals do not photosynthesize. Instead, our cells perform a process called Cellular Respiration

This happens in the mitochondria and the

cytoplasm.

Cellular Respiration

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In photosynthesis, plants take in water and carbon dioxide and produce glucose and oxygen.

Photosynthesis vs. Cellular Respiration

Glucose (food)

Oxygen

In order for cellular respiration to occur, cells need to take in this

glucose (sugar), which is collected through food.

The cells also need this oxygen, which is collected by lungs, gills, or

other similar structures.

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Cellular Respiration

In this process, our cells also release energy. This

means that cellular respiration is an

exothermic reaction.

Glucose (food)

Oxygen

H

O

H

C OO

water

Carbon Dioxide

Energy

Our cells turn these reactants into water and carbon dioxide, which coincidentally is needed by photosynthetic organisms!

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____ + _____ _____ + _____+ _____

Equation for Cellular Respiration

Drag and drop the reactants and products into the correct place in the equation.

Carbon

DioxideWater

GlucoseOxygenEnergy

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Equation for Cellular Respiration

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.

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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

These two processes are opposites.

The products of one are the raw materials of the other.

Photosynthesis produces glucose and oxygen, which are then used by Cellular Respiration to release energy, carbon

dioxide and water.

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Photosynthesis

Cellular Respiration

Plants Use:

________ and WaterPlants Produce:

_______ and oxygen

Carbon Dioxide and _______Animals Produce:

_________ Cell

_____________

________ Cell

_____________

Animals Use

glucose and

________

Fill in the blanks

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7 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

D They are opposite processes

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Matter and Energy Flow

Return to Table 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...

Photosynthesis

Cellular Respiration

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Complete the chart below

_____________

______________

Energy, Water and Carbon Dioxide RELEASED

Energy STORED Glucose and Oxygen RELEASED

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8 How does energy flow through the cycle of Photosynthesis and Cellular Respiration?

A Energy is stored and never released

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

Ans

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Draw your own

Chart of matter and energy flow

Include:

All materials and the amounts of each

A plant

An animal

All terms

Where energy is stored

Where energy is released/ reused

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