Question

what is your prediction for this experiment?
a. the rate of photosynthesis is greater in white light than in darkness.
b. the rate of photosynthesis decreases in ultraviolet white versus white light.
c. the rate of photosynthesis is similar in white light and darkness.
d. the rate of photosynthesis is greater in darkness than in white light.

how will you determine the effect of presence of light on the rate of photosynthesis?
a. i will compare the rate of photosynthesis with and without white light.
b. i will compare the rate of photosynthesis with different amounts of elodeea leaves.
c. i will compare the rate of photosynthesis with and without water.

Explanation:

Analyze the first question on experimental prediction

Using the Photosynthesis Reactants knowledge point

Photosynthesis is a light-dependent biochemical process where plants convert light energy, carbon dioxide, and water into chemical energy (glucose) and oxygen. Since light is a required reactant/energy source for the light-dependent reactions, the rate of photosynthesis will be significantly higher in the presence of light (white light) compared to complete darkness, where the light-dependent reactions cannot occur. Therefore, the logical prediction is that the rate of photosynthesis is greater in white light than in darkness.

Analyze the second question on experimental design

Using the Rate of Photosynthesis Calculation knowledge point

To determine the specific effect of a single independent variable (the presence of light) on a dependent variable (the rate of photosynthesis), an experiment must compare a treatment group where the variable is present against a control group where the variable is absent, keeping all other factors constant. Thus, comparing the rate of photosynthesis with white light (treatment) and without white light (darkness control) is the correct method.

Answer:

Question 1

• A. The rate of photosynthesis is greater in white light than in darkness. (Correct answer)
• B. The rate of photosynthesis decreases in ultraviolet white versus white light.
• C. The rate of photosynthesis is similar in white light and darkness.
• D. The rate of photosynthesis is greater in darkness than in white light.

Question 2

• A. I will compare the rate of photosynthesis with and without white light. (Correct answer)
• B. I will compare the rate of photosynthesis with different amounts of Elodea leaves.
• C. I will compare the rate of photosynthesis with and without water.