questions:
1. aspen trees photosynthesize the most at what temperature?
2. complete this sentence: between 10°c and 35°c the rate of photosynthesis
3. complete this sentence: between 35°c and 55°c the rate of photosynthesis
4. how does the rate of photosynthesis compare between 10°c and 20°c?

5. why doesn’t the rate of photosynthesis keep increasing as the temperature increases? hint: in humans a high temperature much above 37°c (98.6°f) can be fatal.

6. use your graph to predict the rate of photosynthesis at the following temperatures by estimating the amount of carbon dioxide used for the process. write the estimated amount of co₂ for each temperature.
a. 17°c
b. 38°c
c. 60°c

7. list three other factors could you test which could have an effect on photosynthetic rate. hint: look at the equation of photosynthesis.
a.
b.
c.

8. where in the plant cell is photosynthesis occurring?

Question

questions:
1. aspen trees photosynthesize the most at what temperature?
2. complete this sentence: between 10°c and 35°c the rate of photosynthesis
3. complete this sentence: between 35°c and 55°c the rate of photosynthesis
4. how does the rate of photosynthesis compare between 10°c and 20°c?

5. why doesn’t the rate of photosynthesis keep increasing as the temperature increases? hint: in humans a high temperature much above 37°c (98.6°f) can be fatal.

6. use your graph to predict the rate of photosynthesis at the following temperatures by estimating the amount of carbon dioxide used for the process. write the estimated amount of co₂ for each temperature.
   a. 17°c
   b. 38°c
   c. 60°c

7. list three other factors could you test which could have an effect on photosynthetic rate. hint: look at the equation of photosynthesis.
   a.
   b.
   c.

8. where in the plant cell is photosynthesis occurring?

Accepted Answer

### Question 1:
# Brief Explanations:
Aspen trees (like most plants) have an optimal temperature for photosynthesis. Typically, many plants have peak photosynthesis around 25 - 35°C, but without a graph (implied by later questions), we assume the optimal (most photosynthesis) is around 35°C (common in such studies if following typical trends, or maybe 25 - 30°C, but the handwritten guess was 35°C, so likely 35°C as a common optimal temp for many plants in lab settings).
# Answer:
35°C (or a range around 25 - 35°C, but likely 35°C as per common lab - based photosynthesis temperature optima for many plants)

### Question 2:
# Brief Explanations:
Between 10°C and 35°C, as temperature increases, the rate of photosynthesis generally increases. This is because enzymes involved in photosynthesis (like Rubisco) have increasing activity with temperature in this range (up to the optimal temp).
# Answer:
increases

### Question 3:
# Brief Explanations:
Between 35°C and 55°C, the rate of photosynthesis decreases. This is because temperatures above the optimal (35°C here, likely) cause enzymes (like those in the Calvin cycle or light - dependent reactions) to denature or have reduced activity, slowing the photosynthetic process.
# Answer:
decreases

### Question 4:
# Brief Explanations:
Between 10°C and 20°C, the rate of photosynthesis increases as temperature rises. The increase from 10 to 20 is part of the range (10 - 35) where temperature - dependent enzyme activity (for photosynthesis) is increasing. So the rate between 10 - 20°C is increasing (and the rate at 20°C is higher than at 10°C).
# Answer:
The rate of photosynthesis between 10°C and 20°C is increasing (the rate at 20°C is higher than at 10°C)

### Question 5:
# Brief Explanations:
Photosynthesis depends on enzymes (e.g., Rubisco, ATP synthase). Enzymes have a specific 3 - D structure (including an active site) for substrate binding. High temperatures (much above 37°C, similar to how human enzymes are affected) cause enzymes to denature (lose their specific structure, including the active site). When denatured, enzymes can no longer efficiently catalyze the reactions of photosynthesis, so the rate stops increasing and may decrease.
# Answer:
Photosynthesis relies on enzymes. Temperatures much above 37°C (or the plant's optimal temp, like 35°C here) cause these enzymes (e.g., Rubisco) to denature (lose their 3 - D structure, including the active site). Without a functional active site, enzymes can't efficiently catalyze photosynthetic reactions, so the rate stops increasing (and decreases) as temperature rises beyond the optimal.

### Question 6:
# Brief Explanations:
- **17°C**: In the 10 - 35°C range, rate increases with temp. If at 10°C, say, the rate (CO₂ used) is low, and at 25°C moderate, at 17°C (mid - way in 10 - 35) we estimate. If the graph is a curve increasing from 10 - 35, at 17°C, estimate a moderate amount, e.g., if at 10°C it's 5 units, 25°C 15 units, 17°C might be ~10 units (hypothetical, as no graph, but following the increasing trend in 10 - 35).
- **38°C**: Just above 35°C (optimal), so rate is decreasing. So CO₂ used is less than at 35°C. If at 35°C it was 20 units, at 38°C maybe 15 units (as denaturation starts, activity drops).
- **60°C**: Very high temp, enzymes are largely denatured. Photosynthesis rate is very low (maybe near zero), so CO₂ used is minimal (e.g., 1 - 2 units, or near zero).
# Answer:
- a. 17°C: ~10 units (of CO₂, hypothetical, based on increasing trend 10 - 35)
- b. 38°C: ~15 units (of CO₂, decreasing from 35°C optimal)
- c. 60°C: ~0 - 2 units (of CO₂, very low due to enzyme denaturation)

### Question 7:
# Brief Explanations:
The photosynthesis equation is $6CO_2 + 6H_2O\xrightarrow[Chlorophyll]{Light}C_6H_{12}O_6+6O_2$. Factors from the equation:
- **Light intensity**: More light (up to saturation) provides more energy for the light - dependent reactions (ATP, NADPH production).
- **Carbon dioxide concentration**: More $CO_2$ provides more substrate for the Calvin cycle (Rubisco fixes $CO_2$).
- **Water availability**: Water is a reactant; less water (e.g., drought) reduces the rate as it's needed for photolysis and as a reactant.
# Answer:
- a. Light intensity
- b. Carbon dioxide concentration
- c. Water availability

### Question 8:
# Brief Explanations:
Photosynthesis occurs in the chloroplasts of plant cells. The light - dependent reactions occur in the thylakoid membranes (and lumen) of chloroplasts, and the Calvin cycle (light - independent) occurs in the stroma of chloroplasts.
# Answer:
Chloroplasts (specifically, light - dependent in thylakoids, light - independent in stroma)

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