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Photosynthesis & Transpiration

Photosynthesis & Transpiration

Assessment

Presentation

Science

7th Grade

Easy

NGSS
MS-LS1-6, MS-LS2-1, MS-LS1-5

+2

Standards-aligned

Created by

MATTHEW WILLIAMS

Used 24+ times

FREE Resource

59 Slides • 15 Questions

1

Photosynthesis & Transpiration

Article published by the Smithsonian Science Education Center... except for the transpiration part.

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When you get hungry, you grab a snack from your fridge or pantry.

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But what can plants do when they get hungry? 

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You are probably aware that plants need sunlight, water, and a home (like soil) to grow, but where do they get their food? 

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They make it themselves!

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Plants are called autotrophs because they can use energy from light to synthesize, or make, their own food source.

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Open Ended

Why are plants called autotrophs?

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Many people believe they are “feeding” a plant when they put it in soil, water it, or place it outside in the Sun, but none of these things are considered food.

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9

Multiple Choice

Are soil, water, and the Sun considered food for a plant?

1

yes

2

no

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Rather, plants use sunlight, water, and the gases in the air to make glucose, which is a form of sugar that plants need to survive.

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Multiple Choice

What is a form of sugar that plants need to survive?

1

sucrose

2

glucose

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This process is called photosynthesis and is performed by all plants, algae, and even some microorganisms.

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To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight.

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14

Multiple Select

What do plants use to photosynthesize glucose?[click 3]

1

nutrients

2

carbon dioixide

3

fertilizer

4

water

5

sunlight

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By taking in water (H2O) through the roots, carbon dioxide (CO2) from the air, and light energy from the Sun, plants can perform photosynthesis to make glucose (sugars) and oxygen (O2). 

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16

Multiple Choice

Besides glucose, what else is made during photosynthesis?

1

O2 (oxygen)

2

more carbon dioxide

3

water

4

flowers

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Just like you, plants need to take in gases in order to live.

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Animals take in gases through a process called respiration.

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During the respiration process, animals inhale all of the gases in the atmosphere, but the only gas that is retained and not immediately exhaled is oxygen. 

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Plants, however, take in and use carbon dioxide gas for photosynthesis.

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Multiple Choice

Which gas do plants use for photosynthesis?

1

oxygen

2

helium

3

nitrogen

4

carbon dioxide

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Carbon dioxide enters through tiny holes called stomata in a plant’s leaves, flowers, branches, stems, and roots.

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23

Multiple Choice

What are the tiny holes in a plant's leaves called?

1

pores

2

stomata

24

Plants also require water to make their food.

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Depending on the environment, a plant’s access to water will vary.

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For example, desert plants, like a cactus, have less available water than a lilypad in a pond, but every photosynthetic organism has some sort of adaptation, or special structure, designed to collect water.

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For most plants, roots are responsible for absorbing water. 

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The last requirement for photosynthesis is an important one because it provides the energy to make sugar.

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How does a plant take carbon dioxide and water molecules and make a food molecule?

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The Sun!

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The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas. 

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Multiple Select

The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make what two things? [click 2]

1

oxygen gas

2

carbon dioxide gas

3

sucrose

4

glucose

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After the sugar is produced, it is then broken down by the mitochondria into energy that can be used for growth and repair.

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The oxygen that is produced is released from the same tiny holes through which the carbon dioxide entered.

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Even the oxygen that is released serves another purpose. Other organisms, such as animals, use oxygen to aid in their survival. 

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If we were to write a formula for photosynthesis, it would look like this: 

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6CO2 + 6H2O + Light energy → C6H12O6 (sugar) + 6O2 

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Multiple Choice

How many oxygen molecules are created in the equation of photosynthesis? [look after the arrow]

1

4

2

5

3

6

4

7

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The whole process of photosynthesis is a transfer of energy from the Sun to a plant.

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Open Ended

What is the whole process of photosynthesis?

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In each sugar molecule created, there is a little bit of the energy from the Sun, which the plant can either use or store for later.

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Imagine a pea plant. If that pea plant is forming new pods, it requires a large amount of sugar energy to grow larger.

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This is similar to how you eat food to grow taller and stronger.

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But rather than going to the store and buying groceries, the pea plant will use sunlight to obtain the energy to build sugar.

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When the pea pods are fully grown, the plant may no longer need as much sugar and will store it in its cells.

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A hungry rabbit comes along and decides to eat some of the plant, which provides the energy that allows the rabbit to hop back to its home.

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Where did the rabbit’s energy come from?

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Consider the process of photosynthesis.

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With the help of carbon dioxide and water, the pea pod used the energy from sunlight to construct the sugar molecules.

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When the rabbit ate the pea pod, it indirectly received energy from sunlight, which was stored in the sugar molecules in the plant. 

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51

Bread is Made from Flour

We can thank photosynthesis for bread! Wheat grains, like the ones pictured, are grown in huge fields. When they are harvested, they are ground into a powder that we might recognize as flour. 

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Humans, other animals, fungi, and some microorganisms cannot make food in their own bodies like autotrophs, but they still rely on photosynthesis.

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Multiple Choice

Do humans, other animals, fungi, and some microorganisms rely on photosynthesis?

1

yes

2

no

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Through the transfer of energy from the Sun to plants, plants build sugars that humans consume to drive our daily activities.

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Even when we eat things like chicken or fish, we are transferring energy from the Sun into our bodies because, at some point, one organism consumed a photosynthetic organism (e.g., the fish ate algae). 

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So the next time you grab a snack to replenish your energy, thank the Sun for it! 

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57

Multiple Select

What three things does a plant need for photosynthesis? [click 3]

1

water

2

carbon dioxide

3

sunlight

4

nutrients

58

Multiple Select

What two things are created by photosynthesis? [click 2]

1

water

2

oxygen

3

carbon dioxide

4

glucose

59

Transpiration

Transpiration is the evaporation of water from plants.

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60

Multiple Choice

What is trhe evaporation of water from plants?

1

respiration

2

evaporation

3

photosynthesis

4

transpiration

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Transpiration occurs chiefly at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis.

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The evaporation of water molecules from leaves is the main force pulling the water column up from its origin in the roots.

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When water evaporates from a leaf, water deeper in the leaf is pulled to the surface of that leaf.

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At the same time, water is pulled from the stem where the leaf is attached.

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At the same time, water is pulled from the branch the stem is attached to.

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At the same time, water is pulled from the trunk the branch is attached to.

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At the same time, water is pulled from the roots of the tree or plant.

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At the same time, water is absorbed by the roots of a tree or plant from the soil in which the tree or plant is planted.

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If there is too much water in the soil, the stoma of a plant's leaves will open all the way to evaporate as much extra water as possible.

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If there isn't enough water in the soil, the stoma of a plant's leaves will close to slow down evaporation and conserve water.

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Transpiration is the process of water moving through a plant from it's roots to it's leaves where water will then evaporate through the stomata of the leaves.

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72

Open Ended

What is transpiration?

73

Now open another tab and Google search "infamy definition."

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After you finish this Quizizz, read the article A Date Which Will Live In Infamy under Daily Assignments in Google Classroom and complete the Google Quiz form underneath that article in Google Classroom.

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Photosynthesis & Transpiration

Article published by the Smithsonian Science Education Center... except for the transpiration part.

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