Question

photosynthesis
where in the plant cell?
purpose: why do we need this?
photosynthesis is...
write the equation reactants → products
steps
color the diagram. label the parts of the diagram:

Explanation:

To answer the questions related to this photosynthesis worksheet, we'll address each section:

1. "Where in the plant cell?"

The organelle where photosynthesis occurs is the chloroplast. The diagram shows a chloroplast (the oval with thylakoids), so the answer is the chloroplast.

2. "Purpose: Why do we need this?"

Photosynthesis converts light energy into chemical energy (glucose) to provide food/energy for plants (and ultimately for organisms that consume plants). It also produces oxygen, which is essential for aerobic respiration in most living things.

3. "Write the equation: Reactants → Products"

The chemical equation for photosynthesis is:
$$\text{Carbon Dioxide} + \text{Water} \xrightarrow{\text{Light Energy}} \text{Glucose} + \text{Oxygen}$$
In formula terms:
$$6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{Light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$$

4. "Steps"

Photosynthesis has two main stages:

• Light - Dependent Reactions: Occur in the thylakoid membranes (labeled "F" in the diagram). They use light energy to split water, produce ATP, NADPH, and release oxygen.
• Light - Independent Reactions (Calvin Cycle): Occur in the stroma (around the thylakoids, labeled "M" as the cycle). They use ATP, NADPH, and carbon dioxide to synthesize glucose.

5. "Color the diagram & Label the parts"

• Sun (A): Provides light energy.
• Chloroplast: The oval structure with thylakoids (F) and stroma (M).
• Thylakoids (F): Site of light - dependent reactions.
• Stroma (M): Site of the Calvin Cycle.
• Water (absorbed by roots): Enters the chloroplast.
• Carbon Dioxide (from the air): Enters the leaf and chloroplast.
• Oxygen (released): By - product of light - dependent reactions.
• Glucose (produced): Output of the Calvin Cycle, used by the plant.

Final Answers (Key Points)

• "Where in the plant cell?": Chloroplast
• "Purpose": Produce glucose (energy) and oxygen.
• "Equation": $6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{Light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$
• "Steps": Light - dependent (thylakoids) and light - independent (Calvin Cycle, stroma) reactions.

Answer:

To answer the questions related to this photosynthesis worksheet, we'll address each section:

1. "Where in the plant cell?"

The organelle where photosynthesis occurs is the chloroplast. The diagram shows a chloroplast (the oval with thylakoids), so the answer is the chloroplast.

2. "Purpose: Why do we need this?"

Photosynthesis converts light energy into chemical energy (glucose) to provide food/energy for plants (and ultimately for organisms that consume plants). It also produces oxygen, which is essential for aerobic respiration in most living things.

3. "Write the equation: Reactants → Products"

The chemical equation for photosynthesis is:
$$\text{Carbon Dioxide} + \text{Water} \xrightarrow{\text{Light Energy}} \text{Glucose} + \text{Oxygen}$$
In formula terms:
$$6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{Light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$$

4. "Steps"

Photosynthesis has two main stages:

• Light - Dependent Reactions: Occur in the thylakoid membranes (labeled "F" in the diagram). They use light energy to split water, produce ATP, NADPH, and release oxygen.
• Light - Independent Reactions (Calvin Cycle): Occur in the stroma (around the thylakoids, labeled "M" as the cycle). They use ATP, NADPH, and carbon dioxide to synthesize glucose.

5. "Color the diagram & Label the parts"

• Sun (A): Provides light energy.
• Chloroplast: The oval structure with thylakoids (F) and stroma (M).
• Thylakoids (F): Site of light - dependent reactions.
• Stroma (M): Site of the Calvin Cycle.
• Water (absorbed by roots): Enters the chloroplast.
• Carbon Dioxide (from the air): Enters the leaf and chloroplast.
• Oxygen (released): By - product of light - dependent reactions.
• Glucose (produced): Output of the Calvin Cycle, used by the plant.

Final Answers (Key Points)

• "Where in the plant cell?": Chloroplast
• "Purpose": Produce glucose (energy) and oxygen.
• "Equation": $6\text{CO}_2 + 6\text{H}_2\text{O} \xrightarrow{\text{Light}} \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$
• "Steps": Light - dependent (thylakoids) and light - independent (Calvin Cycle, stroma) reactions.