Solved Activity 6: Photosynthesis Worksheet Name: Date: • | Chegg.com - Free Printable

Problem Overview:

The task is to label the diagram of photosynthesis, summarizing its two main stages: the light-dependent reactions and the Calvin cycle (light-independent reactions). The provided word bank contains terms related to these processes, which need to be matched with the appropriate parts of the diagram.

Diagram Analysis:

The diagram illustrates the structure of a chloroplast and the processes occurring within it. Here's a breakdown of the labeled parts:

1. Light energy (yellow arrows) enters the chloroplast.
2. Water (H₂O) is present in the stroma.
3. Carbon dioxide (CO₂) enters the chloroplast.
4. Thylakoids are stacked into grana.
5. Granum (plural: grana) is a stack of thylakoids.
6. Light reactions occur on the thylakoid membranes.
7. ATP and NADPH are produced during the light reactions.
8. Calvin cycle occurs in the stroma.
9. Sugar is the final product of the Calvin cycle.
10. Energy from ATP and NADPH drives the Calvin cycle.
11. Stroma is the fluid-filled space where the Calvin cycle occurs.
12. ADP + P (adenosine diphosphate and phosphate) is used to regenerate ATP.
13. Oxygen (O₂) is released as a byproduct of the light reactions.
14. Final product (sugar) exits the chloroplast.

Solution:

Using the word bank, we can fill in the blanks as follows:

1. Light
2. H₂O
3. CO₂
4. Thylakoids
5. Granum
6. Light reactions
7. ATP, NADPH
8. Calvin cycle
9. Sugar
10. Energy from ATP and NADPH
11. Stroma
12. ADP + P
13. O₂
14. Sugar

Final Labeled Diagram:

- 1. Light
- 2. H₂O
- 3. CO₂
- 4. Thylakoids
- 5. Granum
- 6. Light reactions
- 7. ATP, NADPH
- 8. Calvin cycle
- 9. Sugar
- 10. Energy from ATP and NADPH
- 11. Stroma
- 12. ADP + P
- 13. O₂
- 14. Sugar

Explanation:

1. Light energy (1) is captured by pigments in the thylakoid membranes.
2. Water (H₂O) (2) is split during the light reactions, releasing oxygen (O₂) (13) as a byproduct.
3. Carbon dioxide (CO₂) (3) enters the chloroplast and is used in the Calvin cycle.
4. Thylakoids (4) are the sites of the light reactions, where ATP and NADPH are produced.
5. Granum (5) refers to a stack of thylakoids.
6. Light reactions (6) occur on the thylakoid membranes, converting light energy into chemical energy (ATP and NADPH).
7. ATP and NADPH (7) are energy carriers used in the Calvin cycle.
8. The Calvin cycle (8) occurs in the stroma (11), using ATP and NADPH to fix CO₂ into sugar.
9. Sugar (9) is the final product of the Calvin cycle.
10. Energy from ATP and NADPH (10) drives the Calvin cycle.
11. The stroma (11) is the fluid-filled region of the chloroplast where the Calvin cycle takes place.
12. ADP + P (12) is recycled back into ATP during the light reactions.
13. Oxygen (O₂) (13) is released as a byproduct of water splitting in the light reactions.
14. The final product, sugar (14), exits the chloroplast for use by the plant.

Final Answer:

\[
\boxed{
\begin{aligned}
1. & \text{ Light} \\
2. & \text{ H₂O} \\
3. & \text{ CO₂} \\
4. & \text{ Thylakoids} \\
5. & \text{ Granum} \\
6. & \text{ Light reactions} \\
7. & \text{ ATP, NADPH} \\
8. & \text{ Calvin cycle} \\
9. & \text{ Sugar} \\
10. & \text{ Energy from ATP and NADPH} \\
11. & \text{ Stroma} \\
12. & \text{ ADP + P} \\
13. & \text{ O₂} \\
14. & \text{ Sugar}
\end{aligned}
}
\]