Question

reactions of photosynthesis review
name
date

directions: label the diagram below to summarize the two stages of photosynthesis. use the word bank below the diagram to fill in the blanks

1
2
3
4
5
6
7
8
9
10
11
12
13
14

word bank:
thylakoid
granum
stroma
light - dependent reactions
calvin cycle
light
h₂o
sugar
co₂
nadp⁺
nadph
adp
atp
o₂

Answer:

To solve this photosynthesis diagram labeling, we analyze each part based on photosynthesis stages (light - dependent and Calvin Cycle) and the word bank:

Step 1: Identify Structure 1

Structure 1 is related to the energy source for photosynthesis. From the word bank, "light" is the energy that starts photosynthesis. So, 1: light.

Step 2: Identify Substance 2

Substance 2 is taken in and split in light - dependent reactions. The word "H₂O" (water) is split to release oxygen and provide electrons. So, 2: H₂O.

Step 3: Identify Structure 3

Structure 3 is the product of water splitting. When water is split, oxygen (O₂) is released. So, 3: O₂.

Step 4: Identify Structure 4

Structure 4 is the fluid - filled space in the chloroplast where the Calvin Cycle occurs. The word "Stroma" fits this description. So, 4: Stroma.

Step 5: Identify Structure 5

Structure 5 is a stack of thylakoids. The term "granum" (plural: grana) is used for a stack of thylakoids. So, 5: granum.

Step 6: Identify Structure 6

Structure 6 is the membrane - bound structure where light - dependent reactions occur. The word "thylakoid" is correct. So, 6: thylakoid.

Step 7: Identify Process 7

Process 7 is the type of reaction happening in thylakoids. "Light - dependent reactions" occur in thylakoids. So, 7: Light - dependent reactions.

Step 8: Identify Molecule 8

Molecule 8 is produced in light - dependent reactions and used in the Calvin Cycle. "ATP" is made in light - dependent reactions and used in the Calvin Cycle. So, 8: ATP.

Step 9: Identify Molecule 9

Molecule 9 is also produced in light - dependent reactions and used in the Calvin Cycle. "NADPH" is produced in light - dependent reactions. So, 9: NADPH.

Step 10: Identify Substance 10

Substance 10 is the other product of water splitting (after oxygen). Wait, no, substance 10: when water is split, O₂ is released (structure 3), and the other product related to the electron transport is not directly, but from the word bank, "ADP" is involved in ATP synthesis (ADP + Pi→ATP). Wait, no, let's re - check. Wait, in light - dependent reactions, ADP is converted to ATP. But maybe I made a mistake. Wait, the word bank has ADP. Wait, no, let's look at the Calvin Cycle part. Wait, no, structure 10: maybe I messed up. Wait, let's start over for the Calvin Cycle part.

Step 11: Identify Process 11

Process 11 is the cycle that uses CO₂, ATP, and NADPH to make sugar. The "Calvin Cycle" is this process. So, 11: Calvin Cycle.

Step 12: Identify Substance 12

Substance 12 is the product of the Calvin Cycle. The word "sugar" (like glucose) is the end product of the Calvin Cycle. So, 12: sugar.

Step 13: Identify Substance 13

Substance 13 is the input to the Calvin Cycle. Carbon dioxide (CO₂) is the input for the Calvin Cycle. So, 13: CO₂.

Step 14: Identify Molecule 14 (used in Calvin Cycle)

Molecule 14 is a molecule that is regenerated or involved in the Calvin Cycle. "NADP⁺" is regenerated when NADPH donates electrons in the Calvin Cycle. Wait, or "ADP"? Wait, no, let's check the word bank. The word bank has NADP⁺, ADP. Wait, in the Calvin Cycle, ATP is used (becomes ADP) and NADPH is used (becomes NADP⁺). So, 14: NADP⁺ (or ADP? Wait, let's re - check the diagram. The arrows: in the Calvin Cycle, NADPH and ATP are used, producing NADP⁺ and ADP. Let's assume 14 is NADP⁺ (or ADP, but let's go with the standard). Wait, maybe I made a mistake in step 10. Let's correct step 10: Substance 10: when water is split, we have O₂ (structure 3), and the other part is electrons and protons, but from the word bank, maybe step 10 is ADP? No, that doesn't fit. Wait, maybe step 10 is ADP? No, let's re - list all:

1. light
2. H₂O
3. O₂
4. Stroma
5. granum
6. thylakoid
7. Light - dependent reactions
8. ATP
9. NADPH
10. ADP (Wait, no, ADP is converted to ATP in light - dependent reactions. So maybe step 10 is NADP⁺? No, this is getting confusing. Let's use the standard photosynthesis diagram:

• Light - dependent reactions (in thylakoids):
• Input: light, H₂O
• Output: O₂, ATP, NADPH
• Molecules involved: ADP (converted to ATP), NADP⁺ (converted to NADPH)
• Calvin Cycle (in stroma):
• Input: CO₂, ATP, NADPH
• Output: sugar (glucose), ADP, NADP⁺

So, let's re - assign:

1. light (energy source)
2. H₂O (input, split)
3. O₂ (output of water splitting)
4. Stroma (where Calvin Cycle occurs)
5. granum (stack of thylakoids)
6. thylakoid (where light - dependent reactions occur)
7. Light - dependent reactions (process in thylakoids)
8. ATP (produced in light - dependent, used in Calvin)
9. NADPH (produced in light - dependent, used in Calvin)
10. ADP (regenerated in Calvin, used in light - dependent) or NADP⁺? Wait, the word bank has ADP and NADP⁺. Let's see the diagram: the arrow from the Calvin Cycle to the light - dependent reactions: ADP and NADP⁺ are sent back. So, 10: ADP (or NADP⁺, but let's pick ADP for step 10? No, maybe step 10 is NADP⁺. This is a bit tricky without the exact diagram, but based on standard labeling:

1. light
2. H₂O
3. O₂
4. Stroma
5. granum
6. thylakoid
7. Light - dependent reactions
8. ATP
9. NADPH
10. ADP (or NADP⁺, but let's go with ADP)
11. Calvin Cycle
12. sugar
13. CO₂
14. NADP⁺ (since NADPH donates electrons in Calvin Cycle, becoming NADP⁺)

Final Answers (partial, as an example of correct labeling):

1. light
2. H₂O
3. O₂
4. Stroma
5. granum
6. thylakoid
7. Light - dependent reactions
8. ATP
9. NADPH
10. ADP (or NADP⁺, depending on the diagram's arrow direction)
11. Calvin Cycle
12. sugar
13. CO₂
14. NADP⁺ (or ADP)

(Note: The exact labeling may vary slightly depending on the specific diagram's arrow directions and the intended flow of molecules, but the above follows the basic photosynthesis process.)