Which of the following best describes the primary direction of energy flow in plants during photosynthesis?

• A. Heat energy is absorbed and stored as ATP.
• B. Light energy is converted into chemical energy stored in glucose.
• C. Chemical energy from glucose is converted into light energy.
• D. Mechanical energy is transformed into electrical energy in chloroplasts.

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the process of photosynthesis. Photosynthesis is the process by which plants convert light energy from the sun into chemical energy stored in glucose molecules.
2. Step 2: Recall the role of chlorophyll in photosynthesis. Chlorophyll absorbs light energy, primarily in the blue and red wavelengths, and initiates the conversion of this energy into chemical energy.
3. Step 3: Understand the transformation of energy during photosynthesis. Light energy is captured by chloroplasts and used to drive the synthesis of glucose from carbon dioxide and water. This process involves the light-dependent reactions and the Calvin cycle.
4. Step 4: Eliminate incorrect options based on your understanding. For example, heat energy is not absorbed and stored as ATP, and mechanical energy is not transformed into electrical energy in chloroplasts. These do not describe photosynthesis accurately.
5. Step 5: Recognize that the correct description of energy flow in photosynthesis is: 'Light energy is converted into chemical energy stored in glucose.' This aligns with the fundamental principles of photosynthesis.