In photosynthesis, what is the energy of a photon first used to do?

• A. Convert carbon dioxide into oxygen
• B. Break down glucose molecules
• C. Excite electrons in chlorophyll
• D. Synthesize ATP directly

Answer: (C)

Verified step by step guidance

1. Understand the role of chlorophyll in photosynthesis: Chlorophyll is a pigment found in the chloroplasts of plant cells. It plays a crucial role in capturing light energy from the sun.
2. Learn about the absorption of light energy: When chlorophyll absorbs light, it uses the energy to excite electrons. This is the initial step in the process of photosynthesis.
3. Explore the concept of electron excitation: Excited electrons are those that have absorbed energy and moved to a higher energy level. This is essential for the subsequent steps in photosynthesis.
4. Recognize the importance of electron excitation: The excited electrons are used to initiate a series of reactions that ultimately lead to the synthesis of ATP and NADPH, which are energy carriers in the cell.
5. Connect electron excitation to the overall process: The excitation of electrons in chlorophyll is the first step that drives the entire photosynthetic process, leading to the conversion of light energy into chemical energy.