Educational worksheet on photosynthesis and cellular respiration processes in plants.

Let’s solve this step by step.

We are looking at a diagram about photosynthesis and how it connects to cellular respiration (though the focus here is mostly on photosynthesis).

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Step 1: Understand what photosynthesis needs and produces

Photosynthesis happens in plant leaves, inside structures called chloroplasts.
It uses:
- Sunlight (energy from the sun)
- Water (H₂O) — absorbed through roots
- Carbon dioxide (CO₂) — enters through stomata in leaves

It produces:
- Glucose (C₆H₁₂O₆) — stored sugar, food for the plant
- Oxygen (O₂) — released into air, used by animals/humans for breathing

The basic equation is:

> Carbon dioxide + Water + Sunlight → Glucose + Oxygen

Or with chemical formulas:

> 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂

But since this worksheet uses simple labels, we’ll match them accordingly.

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Step 2: Fill in the boxes around the leaf

Looking at the arrows pointing TO the leaf (inputs):

- From the sun icon → that’s Sunlight
- From the human breathing in → they breathe in oxygen? Wait — no! Actually, humans breathe out carbon dioxide, which plants take in. So the arrow from human lungs to leaf = carbon dioxide
- From the plant roots with water drops → that’s water

So inputs to leaf:
→ Sunlight
→ Carbon dioxide
→ Water

Now outputs FROM the leaf:

- Arrow going to human breathing out? No — wait, the arrow goes from leaf to human lungs — meaning the leaf releases something humans breathe IN → that’s oxygen
- Arrow going to the glucose molecule model (red/gray balls) → that’s glucose (stored sugar)
- Also, one box says “in the leaf cells... other producers” — that’s where photosynthesis happens → so that should be labeled chloroplast

Wait — let’s look again at the diagram layout:

There are 4 blank boxes around the leaf:

Top left: arrow from sun → must be Sunlight

Left middle: arrow from human lungs → but actually, looking closely, the arrow is FROM human TO leaf → so human exhales CO₂ → so that box = carbon dioxide

Bottom left: arrow from roots/water → that’s water

Right side: two arrows coming OUT of leaf:

→ One goes to human lungs (they inhale O₂) → so that output = oxygen

→ One goes to glucose molecule → that’s glucose

Also, there’s a box INSIDE the leaf saying “in the leaf cells...” → that’s describing WHERE photosynthesis happens → so label that chloroplast

Then, above the leaf, there’s a dashed box for the photosynthesis equation:

It shows:

______ + ______ --(light energy)--> ______ + ______

And below that, another line: ______ + ______ → ______ + ______

Actually, looking at the structure, it seems like they want the word equation filled in twice? Or maybe one is reactants, one is products?

Wait — the top line has “light energy” over the arrow, so:

Reactants: carbon dioxide + water
Products: glucose + oxygen

So:

carbon dioxide + water --(light energy)--> glucose + oxygen

Then the second line might be repeating or showing storage? But probably just fill both lines same way? Or perhaps the second line is for the reverse process? But the title includes “cellular respiration”, so maybe later part is for that.

But looking at the bottom section, there’s also a gray arrow asking: “The purpose of photosynthesis is _______________”

From the word bank: “To make food for the plant.” → that’s correct.

Also, word bank has:

Glucose, carbon dioxide, Oxygen, Sunlight, water, chloroplast, To make food for the plant.

And top small boxes:

O₂, H₂O, C₆H₁₂O₆, CO₂ — these are chemical formulas.

With descriptions:

Roots → takes up water → so H₂O linked to Roots

stored sugar → that’s glucose → C₆H₁₂O₆

enters through stomata → that’s CO₂

supports respiration → that’s O₂ (used in cellular respiration)

So those top boxes are matching formulas to functions.

But our main job is filling the big diagram.

Let me map all blanks clearly:

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Blanks to fill:

1. Top-left box (arrow from sun): Sunlight

2. Left-middle box (arrow from human to leaf): carbon dioxide (because humans exhale CO₂, plants take it in)

3. Bottom-left box (arrow from roots/water): water

4. Inside leaf box (“in the leaf cells...”): chloroplast

5. Right-top box (arrow from leaf to human lungs): oxygen (plants release O₂, humans breathe it in)

6. Right-bottom box (arrow from leaf to glucose model): glucose

7. Dashed box equation (top line):
First blank: carbon dioxide
Second blank: water
Third blank: glucose
Fourth blank: oxygen

(Since it says “+ ___ + ___ → ___ + ___” with light energy over arrow)

8. Second line under that (maybe redundant or for emphasis?): Probably same as above? Or perhaps they want the chemical formulas? But word bank doesn’t include formulas except in top small boxes. Since the instruction is to use provided words, likely repeat:

carbon dioxide + water → glucose + oxygen

But wait — the second line doesn’t have “light energy” written, so maybe it’s implying the overall reaction without specifying energy? Still same.

Alternatively, maybe the second line is for cellular respiration? Because the title includes both processes.

Cellular respiration is the opposite:

Glucose + Oxygen → Carbon dioxide + Water + Energy

And it supports life (including human breathing).

Looking at the diagram: the human figure appears on both sides — breathing in O₂ (from plant), breathing out CO₂ (to plant). So yes, the cycle includes both.

The dashed box may be intended for photosynthesis only, since it has “light energy”.

Then perhaps the second line is meant for cellular respiration? But it’s still inside the “Photosynthesis” dashed box? Hmm.

Let me re-read the diagram text:

There’s a large dashed rectangle labeled “Photosynthesis” containing:

____ + ____ --(light energy)--> ____ + ____

and then below that, within same dashed box:

____ + ____ → ____ + ____

That’s odd. Maybe it’s a mistake? Or perhaps they want the word equation and then the formula version?

But given the word bank, and simplicity, I think both lines are for photosynthesis, and we fill both with same thing.

However, looking at standard teaching diagrams, sometimes they show:

Photosynthesis: CO₂ + H₂O → Glucose + O₂ (with light)

Respiration: Glucose + O₂ → CO₂ + H₂O + energy

And since the title is “Photosynthesis and cellular respiration”, perhaps the second line is for respiration?

But the dashed box is labeled “Photosynthesis”, so probably not.

Another possibility: the first line is reactants and products with energy noted, second line is just the net reaction.

Given ambiguity, and since the word bank matches photosynthesis inputs/outputs, I’ll assume both lines are for photosynthesis.

BUT — wait! Look at the very bottom: there’s a separate gray arrow asking “The purpose of photosynthesis is...” — so the dashed box is definitely for the reaction itself.

Perhaps the second line is optional or duplicate. To be safe, I’ll fill both identically.

However, let’s check the number of blanks.

In the dashed box:

Line 1: 4 blanks (two before arrow, two after)

Line 2: 4 blanks (two before arrow, two after) — total 8 blanks in dashed box.

Word bank has exactly the terms needed.

Alternatively, maybe line 1 is photosynthesis, line 2 is respiration? Even though it’s under “Photosynthesis” heading? That would make sense for the full topic.

Let’s consider context: the diagram shows exchange between plant and human — plant gives O₂ to human, human gives CO₂ to plant; plant makes glucose, which can be used in respiration.

So perhaps:

Line 1 (with light energy): Photosynthesis → CO₂ + H₂O → Glucose + O₂

Line 2 (no energy specified): Cellular Respiration → Glucose + O₂ → CO₂ + H₂O

That fits perfectly!

And the human figure is involved in respiration — they consume O₂ and produce CO₂.

Yes! That makes sense.

So:

Dashed box:

Line 1: carbon dioxide + water --(light energy)--> glucose + oxygen

Line 2: glucose + oxygen → carbon dioxide + water

Perfect.

9. Gray arrow at bottom: “The purpose of photosynthesis is...” → from word bank: To make food for the plant.

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Now, assign all answers:

Boxes around leaf:

- Top left (from sun): Sunlight

- Left middle (from human to leaf): carbon dioxide

- Bottom left (from roots): water

- Inside leaf: chloroplast

- Right top (leaf to human): oxygen

- Right bottom (leaf to glucose model): glucose

Dashed box equations:

Line 1:
First blank: carbon dioxide
Second blank: water
Third blank: glucose
Fourth blank: oxygen

Line 2:
First blank: glucose
Second blank: oxygen
Third blank: carbon dioxide
Fourth blank: water

Gray arrow: To make food for the plant.

Also, the top small boxes (matching formulas to descriptions):

- O₂ → supports respiration

- H₂O → Roots (since roots absorb water)

- C₆H₁₂O₆ → stored sugar

- CO₂ → enters through stomata

These are already matched in the diagram via positioning, but if we need to confirm, that’s correct.

But the user didn’t ask to fill those — the main blanks are the ones around the leaf and in the dashed box and the purpose statement.

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Final Check:

All terms used from word bank:

Used: Sunlight, carbon dioxide, water, chloroplast, oxygen, glucose, To make food for the plant.

Left unused: none — all are used.

Perfect.

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Final Answer:

Boxes around leaf (clockwise from top left):

- Sunlight
- carbon dioxide
- water
- chloroplast (inside leaf)
- oxygen
- glucose

Dashed box equations:

Line 1: carbon dioxide + water → glucose + oxygen
Line 2: glucose + oxygen → carbon dioxide + water

Purpose of photosynthesis: To make food for the plant.