Educational worksheet for learning photosynthesis, covering leaf anatomy and light-dependent reactions.
A worksheet titled "Photosynthesis Virtual Experience" focusing on leaf anatomy and light-dependent reactions, with interactive elements and navigation instructions.
PNG
300×388
60.1 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #692559
⭐
Show Answer Key & Explanations
Step-by-step solution for: Photosynthesis activity and game worksheet leaf anatomy and LD RXN ...
▼
Show Answer Key & Explanations
Step-by-step solution for: Photosynthesis activity and game worksheet leaf anatomy and LD RXN ...
It looks like you've uploaded a worksheet titled "Photosynthesis Virtual Experiment (leaf anatomy and light dependent reactions)" that includes questions related to photosynthesis, leaf anatomy, and the light-dependent reactions. However, I can't view or access images directly. But since you've provided the text of the worksheet, I can help you solve and explain the answers to each question.
Let’s go through each section step by step:
---
1. Where is the plant's food made?
→ Answer: The mesophyll layer (specifically the palisade mesophyll) is where most photosynthesis occurs because it contains many chloroplasts.
2. Where did you place the "roots"? These cells are primarily responsible for doing photosynthesis.
→ This seems to be a trick question. Roots are not involved in photosynthesis.
→ Answer: You should not have placed roots in the leaf. The cells responsible for photosynthesis are mesophyll cells, especially palisade mesophyll cells.
3. This organelle performs photosynthesis.
→ Answer: Chloroplast
4. What are the green dots called where light dependent reactions happen?
→ Answer: Thylakoids (specifically, the stacks of thylakoids are called grana)
5. What is the fluid surrounding the green dots? This is where the light independent (Calvin Cycle) takes place.
→ Answer: Stroma
---
6. Where do light dependent reactions occur?
→ Answer: In the thylakoid membranes of the chloroplast.
7. What are the steps of the light dependent reactions?
→ Answer:
- Light energy is absorbed by chlorophyll in the thylakoid membrane.
- This causes electrons to become excited and gain energy.
- These excited electrons move through an electron transport chain (ETC).
- As electrons move down the ETC, they release energy used to pump H⁺ ions (protons) into the thylakoid space.
- This creates a proton gradient across the thylakoid membrane.
- The flow of H⁺ back out through ATP synthase produces ATP from ADP and Pi (chemiosmosis).
- Electrons eventually reduce NADP⁺ to NADPH.
- Water molecules are split (photolysis) to replace lost electrons, releasing oxygen as a byproduct.
8. The excited electrons continue their way down the _________.
→ Answer: Electron transport chain (ETC)
9. As these electrons move down the chain, they release energy that pumps H⁺ ions across the membrane into the _________. This results in a high concentration of H⁺ in the _________ and a lower concentration in the __________.
→ Answer:
- Into the thylakoid space
- High concentration in the thylakoid space
- Lower concentration in the stroma
10. The diffusion of H⁺ ions through ATP synthase causes ATP synthase to rotate. This rotation allows ATP synthase to produce ________.
→ Answer: ATP
---
| Question | Answer |
|--------|--------|
| 1 | Mesophyll (palisade mesophyll) |
| 2 | Roots are not in leaves; photosynthesis happens in mesophyll cells |
| 3 | Chloroplast |
| 4 | Thylakoids |
| 5 | Stroma |
| 6 | Thylakoid membranes |
| 7 | Light absorption → Electron excitation → Electron transport chain → Proton pumping → ATP synthesis via chemiosmosis → NADPH formation → Water splitting |
| 8 | Electron transport chain |
| 9 | Thylakoid space, thylakoid space, stroma |
| 10 | ATP |
---
- Light-Dependent Reactions: Occur in the thylakoids and require light. They convert light energy into chemical energy (ATP and NADPH), using water and producing oxygen as a byproduct.
- Photolysis: Splitting of water:
\( 2H_2O \rightarrow 4H^+ + 4e^- + O_2 \)
- Chemiosmosis: The movement of protons (H⁺) down their gradient through ATP synthase drives ATP production.
- Electron Transport Chain (ETC): A series of proteins in the thylakoid membrane that transfer electrons and use their energy to create a proton gradient.
- NADPH: An electron carrier that delivers high-energy electrons to the Calvin cycle (light-independent reactions).
---
If you need help filling this out on your worksheet or want a diagram explanation, feel free to ask!
Let’s go through each section step by step:
---
Leaf Anatomy
1. Where is the plant's food made?
→ Answer: The mesophyll layer (specifically the palisade mesophyll) is where most photosynthesis occurs because it contains many chloroplasts.
2. Where did you place the "roots"? These cells are primarily responsible for doing photosynthesis.
→ This seems to be a trick question. Roots are not involved in photosynthesis.
→ Answer: You should not have placed roots in the leaf. The cells responsible for photosynthesis are mesophyll cells, especially palisade mesophyll cells.
3. This organelle performs photosynthesis.
→ Answer: Chloroplast
4. What are the green dots called where light dependent reactions happen?
→ Answer: Thylakoids (specifically, the stacks of thylakoids are called grana)
5. What is the fluid surrounding the green dots? This is where the light independent (Calvin Cycle) takes place.
→ Answer: Stroma
---
Light Dependent Reactions
6. Where do light dependent reactions occur?
→ Answer: In the thylakoid membranes of the chloroplast.
7. What are the steps of the light dependent reactions?
→ Answer:
- Light energy is absorbed by chlorophyll in the thylakoid membrane.
- This causes electrons to become excited and gain energy.
- These excited electrons move through an electron transport chain (ETC).
- As electrons move down the ETC, they release energy used to pump H⁺ ions (protons) into the thylakoid space.
- This creates a proton gradient across the thylakoid membrane.
- The flow of H⁺ back out through ATP synthase produces ATP from ADP and Pi (chemiosmosis).
- Electrons eventually reduce NADP⁺ to NADPH.
- Water molecules are split (photolysis) to replace lost electrons, releasing oxygen as a byproduct.
8. The excited electrons continue their way down the _________.
→ Answer: Electron transport chain (ETC)
9. As these electrons move down the chain, they release energy that pumps H⁺ ions across the membrane into the _________. This results in a high concentration of H⁺ in the _________ and a lower concentration in the __________.
→ Answer:
- Into the thylakoid space
- High concentration in the thylakoid space
- Lower concentration in the stroma
10. The diffusion of H⁺ ions through ATP synthase causes ATP synthase to rotate. This rotation allows ATP synthase to produce ________.
→ Answer: ATP
---
Summary Answers:
| Question | Answer |
|--------|--------|
| 1 | Mesophyll (palisade mesophyll) |
| 2 | Roots are not in leaves; photosynthesis happens in mesophyll cells |
| 3 | Chloroplast |
| 4 | Thylakoids |
| 5 | Stroma |
| 6 | Thylakoid membranes |
| 7 | Light absorption → Electron excitation → Electron transport chain → Proton pumping → ATP synthesis via chemiosmosis → NADPH formation → Water splitting |
| 8 | Electron transport chain |
| 9 | Thylakoid space, thylakoid space, stroma |
| 10 | ATP |
---
Explanation of Key Concepts:
- Light-Dependent Reactions: Occur in the thylakoids and require light. They convert light energy into chemical energy (ATP and NADPH), using water and producing oxygen as a byproduct.
- Photolysis: Splitting of water:
\( 2H_2O \rightarrow 4H^+ + 4e^- + O_2 \)
- Chemiosmosis: The movement of protons (H⁺) down their gradient through ATP synthase drives ATP production.
- Electron Transport Chain (ETC): A series of proteins in the thylakoid membrane that transfer electrons and use their energy to create a proton gradient.
- NADPH: An electron carrier that delivers high-energy electrons to the Calvin cycle (light-independent reactions).
---
If you need help filling this out on your worksheet or want a diagram explanation, feel free to ask!
Parent Tip: Review the logic above to help your child master the concept of leaf anatomy worksheet key.
