Photosynthesis crossword puzzle for educational use.

Here's the completed crossword puzzle with explanations for each answer:

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ACROSS

6. PLANTS — *Need light for growth.*
→ Plants are autotrophs that require sunlight to perform photosynthesis, which fuels their growth.

9. IODINE — *Use to test present of starch*
→ Iodine solution turns blue-black in the presence of starch — a common lab test to detect photosynthesis products.

10. PHLOEM — *Sugars travel through plant in ___ vessels*
→ Phloem is the vascular tissue responsible for transporting organic compounds (like sucrose) from source to sink tissues.

11. STARCH — *Glucose stores as*
→ Excess glucose produced during photosynthesis is converted and stored as starch in plant cells for later use.

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DOWN

1. XYLEM — *Water transported from roots in ___ vessels*
→ Xylem is the vascular tissue that transports water and dissolved minerals upward from roots to leaves.

2. CHLOROPLASTS — *Photosynthesis takes place in*
→ Chloroplasts contain chlorophyll and are the organelles where photosynthesis occurs in plant cells.

3. EXOTHERMIC — *Respiration is an ___ reaction*
→ Cellular respiration releases energy (as heat and ATP), making it an exothermic process.

4. ENDOTHERMIC — *Photosynthesis is an ___ reaction*
→ Photosynthesis requires energy input (sunlight) to build glucose, making it an endothermic reaction.

5. ENZYMES — *___ breaks glucose*
→ Enzymes like amylase or glucokinase catalyze the breakdown of glucose during cellular respiration or digestion.

7. GLYCOGEN — *Glucose stored as* *(Note: This is tricky — see explanation below)*
→ In animals, glucose is stored as glycogen. But in plants, it’s stored as starch (which is already used in 11). Since “glucose stored as” is listed separately from “11. Glucose stores as”, this may be a trick or error. However, if we consider general biology, glycogen is the correct term for animal storage. But since this is a photosynthesis worksheet focused on plants, STARCH would be more accurate — but it’s already used in 11.
✔ Best fit: GLYCOGEN — assuming the puzzle allows for cross-kingdom knowledge, or perhaps it’s testing that students know glucose can be stored differently in different organisms.

> ⚠️ Important Note: In a strictly plant-focused context, “glucose stored as” should be STARCH, but since 11 already uses “STARCH”, and 7 is a separate clue, it’s likely the puzzle intends GLYCOGEN as the answer — even though it’s not directly related to photosynthesis in plants. This might be a design flaw, but GLYCOGEN is the standard biological answer for glucose storage in animals.

8. STOMATA — *Carbon dioxide enters the leaf through ___*
→ Stomata (singular: stoma) are tiny pores on the leaf surface that allow gas exchange — CO₂ enters, O₂ exits.

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✔ Final Answers Summary:

Across
6. PLANTS
9. IODINE
10. PHLOEM
11. STARCH

Down
1. XYLEM
2. CHLOROPLASTS
3. EXOTHERMIC
4. ENDOTHERMIC
5. ENZYMES
7. GLYCOGEN *(or possibly STARCH — but STARCH is used in 11)*
8. STOMATA

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📌 Note on Clue 7: If your teacher expects plant-specific answers, you might write STARCH here too — but since 11 is also “Glucose stores as”, it’s likely a duplicate or oversight. In most standardized puzzles, GLYCOGEN is accepted for “glucose stored as” in general biology contexts.

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