7th Grade - Center For Teaching & Learning

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Table of Contents

? Photosynthesis ? Photosynthesis Formula Game ? Cellular Respiration ? Matter and Energy Flow

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7th Grade

Matter and Energy in Everyday Life

2015-10-29

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Photosynthesis

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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 and write your thoughts below.

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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 and write your thoughts below.

Slide 7 / 44 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.

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1 Where does the energy for life come from?

A Earth B The Sun C Food D Fossil Fuels

Slide 8 / 44 Photosynthesis

Many living things can perform photosynthesis:

Plants

Bacteria

Algae

Are there any animals who perform photosynthesis?

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1 Where does the energy for life come from?

A Earth

B The Sun

Answer

C Food

B

D Fossil Fuels

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Slide 10 / 44 Photosynthesis Discovery Lab

Complete Lab assignment according to teacher directions. Check out this video about photosynthesis.

Teacher Notes

Slide 10 (Answer) / 44 Photosynthesis Discovery Lab

Complete Lab assignment aFcicnodrdaicntgivittoy bteyacclhicekrindgirheecrteio.ns. Check out this video ab[Tohius otbjpecht ios atoteascyhenr nthoteesspuisll t.ab]

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Chemicals Involved in Photosynthesis

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

we (and the fish in this picture) need?

Write your thoughts below.

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Chemicals Involved in Photosynthesis

Reactants (what goes into photosynthesis): ? Water: H2O ? Carbon dioxide: CO2 Products (what comes out of photosynthesis): ? 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.

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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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2 What chemical is not part of the photosynthesis process?

A carbon dioxide

Answer

B water D

C glucose

D carbon monoxide

E oxygen

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Slide 14 / 44 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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Reactants for Photosynthesis

Photosynthesis occurs mainly in the leaves of plants and in the chloroplasts.

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.

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

A Sunlight

B Water C Hydrogen

A, B, D

Answer

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

A chloroplast and endoplasmic reticulum

Answer

B mitochondria and golgi body

D

C leaves and nucleus

D chloroplast and stomata

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Multi-Step Process

Photosynthesis is a multi-step process.

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.

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The Calvin Cycle

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 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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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

Answer

A

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Slide 21 / 44 The Calvin Cycle

Why is the Calvin cycle also called the dark reactions?

It is not really dark! It can happen anytime

of the day, but does not require light to

work.

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Photosynthesis Equation

The process can be simplified into the following equation:

6CO2 + 6H2O sunlight C6H12O6 + 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.

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Photosynthesis Equation

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

______ + _____

_______ + ______

Water

Glucose

Carbon Dioxide

Oxygen

Slide 24 / 44 Photosynthesis Formula Game

Learn more about photosynthesis and formulas

by playing this game.

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Teacher Notes

Slide 24 (Answer) / 44 Photosynthesis Formula Game

Find activity by clicking here. Learn more about

photosynthesis and formulas by playing this game.

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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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6 What are the products of photosynthesis?

A Water and carbon dioxide

Answer

B Glucose and oxygen

C Carbon dioxide and glucose

B

D Water and oxygen

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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!

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

Slide 27 / 44 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 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?

Slide 30 / 44 Cellular Respiration

Humans and other animals do not photosynthesize. Instead, our cells perform a process called cellular respiration.

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.

Glucose (food) Oxygen

In order for cellular respiration to occur, cells need totake 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

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.

Glucose (food) Oxygen

H

O water

H

O

C

O

Carbon Dioxide

Energy

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Cellular Respiration Equation

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

____ + _____

_____ + _____+ _____

Water

Glucose

Energy

Carbon Dioxide

Oxygen

Slide 34 / 44 Cellular Respiration Equation

C 6H 12O 6 + 6O 2

6CO 2 + 6H 2O + 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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Cellular Respiration vs Photosynthesis

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.

Slide 37 / 44 Cellular Respiration vs Photosynthesis

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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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

Answer

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7 What is the relationship between photosynthesis and cellular respiration?

A There is no relationship B They are identical

D C They are very similar, but not identical D They are opposite processes

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