Practice Vocabulary Related to Photosynthesis - Free Printable

Let’s go step by step to fill in the blanks correctly.

---

1. The process by which plants use sunlight to create food
→ This is photosynthesis. Plants take sunlight, water, and carbon dioxide to make glucose (food).

2. Organisms that get their food from sunlight or chemical energy
→ These are called autotrophs. They make their own food — like plants using sunlight, or some bacteria using chemicals.

3. Organisms that must consume food for their energy
→ These are heterotrophs. Animals, fungi, and many microbes eat other organisms because they can’t make their own food.

4. Pigment used by green plants to capture light energy
→ That’s chlorophyll. It’s what makes plants green and helps them absorb sunlight.

5. Organelle found in plants that carry out photosynthesis
→ That’s the chloroplast. Inside it, chlorophyll captures light and turns it into energy.

6. Area within the chloroplast where the light-dependent reaction takes place
→ That’s the thylakoid membrane (or just “thylakoids”). Think of them as little pancake stacks inside the chloroplast where light reactions happen.

7. Area within the chloroplast where the Calvin cycle takes place
→ That’s the stroma. It’s the fluid-filled space around the thylakoids where sugar-making happens.

8. Used in the light-dependent reaction: A split from two hydrogens and oxygen
→ This is water (H₂O). Light splits water into hydrogen ions, electrons, and oxygen gas.

9. Required in the Calvin cycle to provide the raw ingredients to make glucose
→ That’s carbon dioxide (CO₂). It provides the carbon atoms needed to build glucose.

10. Captures the sun’s energy; located in the thylakoid membranes
→ Again, this is chlorophyll. It’s embedded in the thylakoid membranes and absorbs light.

11. This molecule is released as a product from the light dependent reactions
→ Oxygen (O₂) is released when water is split during the light reactions.

12. Product of photosynthesis; energy storage for the cell
→ That’s glucose (C₆H₁₂O₆). It’s the sugar made at the end of photosynthesis and stores energy.

13. During the reaction, carbon dioxide is used to create glucose
→ Yes, CO₂ is fixed into organic molecules during the Calvin cycle to eventually form glucose.

14. Molecules that store energy; the 3rd product to power the calvin cycle
→ These are ATP and NADPH. They’re made in the light reactions and used in the Calvin cycle to help build glucose.

15. The energy storing molecule contains 3 phosphate, adenosine, and ribose
→ That’s ATP (adenosine triphosphate). It has adenine + ribose + 3 phosphates.

16. Glucose forms from six carbons. How many times does these reactions need to take place?
→ Since each turn of the Calvin cycle fixes 1 carbon atom, and glucose has 6 carbons, the cycle must run 6 times to make one glucose molecule.

---

Now, let’s label the diagram with reactants and products of photosynthesis:

The general equation is:

6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂

So on the diagram:

- Left side (reactants):
- Top box (from air): Carbon Dioxide (CO₂)
- Bottom left (from roots): Water (H₂O)
- Arrow from sun: Light Energy

- Right side (products):
- Top right (released to air): Oxygen (O₂)
- Bottom right (stored in plant): Glucose (C₆H₁₂O₆)

*(Note: The diagram shows arrows going in and out — we match inputs and outputs accordingly.)*

---

Final Answer:

1. Photosynthesis
2. Autotrophs
3. Heterotrophs
4. Chlorophyll
5. Chloroplast
6. Thylakoid membrane (or thylakoids)
7. Stroma
8. Water (H₂O)
9. Carbon dioxide (CO₂)
10. Chlorophyll
11. Oxygen (O₂)
12. Glucose (C₆H₁₂O₆)
13. Carbon dioxide (CO₂)
14. ATP and NADPH
15. ATP
16. 6

Diagram labels (left to right, top to bottom based on typical layout):

Reactants (inputs):
- From air: Carbon Dioxide
- From soil/roots: Water
- From sun: Light Energy

Products (outputs):
- Released to air: Oxygen
- Stored in plant: Glucose

*(If diagram boxes are arranged differently, adjust accordingly — but standard is: CO₂ and H₂O in, O₂ and glucose out, with light powering it.)*