Question

which of the following is not needed for photosynthesis to occur? *
water
oxygen
sunlight
carbon dioxide

which of the following statements is not true? *
both phases of photosynthesis require sunlight.
plants require different...

Explanation:

First Sub - Question (Which of the following is NOT needed for photosynthesis to occur?)

The process of photosynthesis in plants uses carbon dioxide ($\ce{CO_2}$), water ($\ce{H_2O}$), and sunlight to produce glucose ($\ce{C_6H_{12}O_6}$) and oxygen ($\ce{O_2}$). The chemical equation for photosynthesis is $\ce{6CO_2 + 6H_2O \xrightarrow[chlorophyll]{sunlight} C_6H_{12}O_6 + 6O_2}$. So, oxygen is a product of photosynthesis, not a reactant (something needed for it to occur). Water, sunlight, and carbon dioxide are all reactants (needed) for photosynthesis.

Photosynthesis has two main phases: the light - dependent reactions and the light - independent reactions (Calvin cycle). The light - dependent reactions require sunlight to split water and generate ATP and NADPH. The light - independent reactions (Calvin cycle) do not directly require sunlight; they use the ATP and NADPH produced in the light - dependent reactions to fix carbon dioxide into glucose. So the statement "Both phases of photosynthesis require sunlight" is not true.

Answer:

B. oxygen

Second Sub - Question (Which of the following statements is NOT true? (First option: Both phases of photosynthesis require sunlight.))