Question

Which of the following is an important difference between light-dependent and light-independent reactions of photosynthesis? The light-dependent reactions occur only during the day; the light-independent reactions occur only during the night.A The light-dependent reactions occur in the cytoplasm; the light-independent reactions occur in chloroplasts.B The light-dependent reactions utilize CO2 and H2O; the light-independent reactions produce CO2 and H2O.C The light-dependent reactions depend on the presence of both photosystems I and II; the light-independent reactions require only photosystem I.D The light-dependent reactions produce ATP and NADPH; the light-independent reactions use energy stored in ATP and NADPH.

Answer 1

Answer:

D: The light-dependent reactions produce ATP and NADPH; the light-independent reactions use energy stored in ATP and NADPH.

Explanation:

Photosynthesis is a biological process during which green plants synthesize glucose using inorganic raw materials such as water and carbon dioxide. It is a reaction that takes place in an organelle known as chloroplast, and it consists of 2 reactions;

• the light dependent reaction during which light energy is used to split molecules of water and the resulting electron is used to synthesize ATP and NADPH
• the light independent reaction during which the ATP and NADPH produced in light dependent reaction is used to fix carbon dioxide into glucose.

While the light dependent reaction cannot proceed without light availability, the light independent reaction can proceed both in the presence or absence of light.

Hence, the correct option is D.