What is Photosynthesis worksheet - Free Printable

Let’s go step by step to fill in the blanks using the word box.

The paragraph is about photosynthesis — how plants make their own food.

First sentence:
“__________ is the process by which plants produce their own food...”
→ That’s clearly Photosynthesis.

Next: “...in the presence of __________, __________ and __________.”
From the diagram and science knowledge, plants need:
- Sunlight (from the sun)
- Water (absorbed by roots)
- Carbon dioxide (from air)

So those three are: Sunlight, Water, carbon dioxide

(Note: The word box has “carbon dioxide” written with lowercase ‘c’ — we’ll use it as given.)

Next: “Photosynthesis occurs in the organelle called __________ that’s only found in plants.”
→ That’s the Chloroplast.

Then: “Plants contain a green pigment called __________ that absorbs sunlight.”
→ That’s Chlorophyll.

Next: “Energy from the sun, carbon dioxide from the atmosphere and water absorbed by the roots react to produce __________ that plants need to survive.”
→ Plants make Glucose (their food).

Last: “__________ is a gas that is released into the environment for animals and humans to breathe.”
→ That’s Oxygen.

Now let’s put it all together in order:

1. Photosynthesis
2. Sunlight
3. Water
4. carbon dioxide
5. Chloroplast
6. Chlorophyll
7. Glucose
8. Oxygen

Wait — let’s double-check the sentence structure:

> “__________ is the process by which plants produce their own food in the presence of __________, __________ and __________.”

That’s 4 blanks so far? Actually, no — first blank is the name of the process, then three things needed.

Yes:
Blank 1: Photosynthesis
Blank 2: Sunlight
Blank 3: Water
Blank 4: carbon dioxide

Then:
“Photosynthesis occurs in the organelle called __________” → Blank 5: Chloroplast
“Plants contain a green pigment called __________” → Blank 6: Chlorophyll
“react to produce __________” → Blank 7: Glucose
“__________ is a gas...” → Blank 8: Oxygen

All words from the box are used exactly once? Let’s check the word box:

Word Box:
- Oxygen ✔
- Sunlight ✔
- Glucose ✔
- Photosynthesis ✔
- Chloroplast ✔
- Water ✔
- Chlorophyll ✔
- carbon dioxide ✔

Perfect — all 8 words used.

Final Answer:

Photosynthesis
Sunlight
Water
carbon dioxide
Chloroplast
Chlorophyll
Glucose
Oxygen