4.4_Explaining Photosynthesis

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Carbon: Transformations in Matter and Energy Environmental Literacy Project

Michigan State University

Plants

Unit

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Unit Map

Yo u a re he re u a Yo

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Revisit your arguments

Think about what you know now that you didn’t know before. What have you learned?

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Plants make their own food

4

Food To Cells

Materials for growth: Biosynthesis

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Constructing explanations

Consider the

following as you construct your explanation:

• _{Evidence from the}

investigation

• _{What you learned}

from the molecular

modeling activity

• _{Three Questions}

Handout

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Comparing Ideas with a Partner

• _{Compare your explanations for each of the}

Three Questions.

– _{How are they alike?}

– _{How are they different?}

• _{Check your explanation with the middle- and}

right-hand columns of the Three Questions handout.

• _{Consider making revisions to your explanation}

based on your conversation with your partner.

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Where are atoms moving

from?

Where are atoms moving to?

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Which

atoms and molecules move so

that plants can do photosynthesis?

water

carbon dioxide oxygen

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How do glucose water, carbon dioxide, and oxygen move for a plant leaf to photosynthesize?

water

carbon dioxide oxygen

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Matter Movement

Do you have:

• _{an arrow}

showing carbon dioxide or CO₂ going into the plant’s leaf cell?

10

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Matter Movement

Do you have:

• _{an arrow}

showing water or H₂O going

into the plant’s leaf cell?

11

H₂O

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Matter Movement

Do you have:

• _{an arrow}

showing glucose or

C₆H₁₂O₆ leaving the plant’s leaf cell?

12

Glucose H₂O

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Matter Movement

Do you have:

• _{an arrow}

showing oxygen or O₂ leaving

the plant’s leaf cell?

13

O₂ Glucose

H₂O

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How are atoms in molecules being rearranged into different molecules inside a potato cell during photosynthesis?

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Plants make glucose from

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What happens inside the leaf cell

as it photosynthesizes?

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Matter Change

What is the name of the chemical change that allows cells to make food?

Photosynthesis

Write the chemical equation for this change: 6 CO₂ + 6 H₂O C₆H₁₂O₆ + 6 O₂

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Matter Change

What molecules are carbon atoms in before the chemical change?

Carbon dioxide or CO₂

What other molecules are needed?

Water or H₂O

What molecules are

carbon atoms in after the chemical change?

Glucose or C₆H₁₂0₆

What other molecules are produced?

Oxygen or O₂

18

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Energy Change

What forms of energy go into this chemical change?

Light energy

What forms of energy

come out of this chemical change?

Chemical energy and Heat energy

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Energy

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What happens to glucose made by photosynthesis?

Glucose moves from a plant’s leaves to all of its cells.

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Telling the Whole Story

Question: How does a cell in the potato plant

get food to a cell in its root?

• _{Does your story include these parts?}

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Matter movement: Carbon dioxide and water enter into the cell.

Matter change: Carbon dioxide and water react resulting in glucose and oxygen.

Energy change: The light energy of the sun is converted into chemical energy that

is stored in the high energy C-C and C-H bonds of glucose.

Matter movement: Glucose and oxygen leave the cell. The glucose is transported

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How have your ideas changed?

• _{Gather together your process tools for the unit}

(Expressing Ideas Tool, Predictions Tool, & Evidence-Based Argument Tool).

• _{How have your ideas changed related to:}

– _Scale?

– _Movement? – _Carbon?

• _{What do you know now about how plants make}

glucose that you didn’t know before the investigation?

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Revisit unanswered questions

• _{Which unanswered}

questions can you now answer with what you

understand about photosynthesis?

• _{Which questions}

are left

unanswered?

• _{Do you have any}

new questions to add?