The most important role of pigments in photosynthesis is to __________.

• A. provide structural support to chloroplasts
• B. absorb light energy and convert it into chemical energy
• C. produce oxygen directly from carbon dioxide
• D. supply water to the plant cells

Answer: (B)

Verified step by step guidance

1. Understand the role of pigments in photosynthesis: Pigments, such as chlorophyll, are molecules that absorb specific wavelengths of light. Their primary function is to capture light energy from the sun.
2. Recall the process of photosynthesis: Photosynthesis is the process by which plants convert light energy into chemical energy stored in glucose. This process occurs in the chloroplasts and involves light-dependent and light-independent reactions.
3. Focus on the light-dependent reactions: In these reactions, pigments like chlorophyll absorb light energy, which excites electrons. These high-energy electrons are then used to produce ATP and NADPH, which are essential for the light-independent reactions.
4. Eliminate incorrect options: Providing structural support to chloroplasts is not a function of pigments. Producing oxygen directly from carbon dioxide is incorrect because oxygen is produced from the splitting of water molecules. Supplying water to plant cells is unrelated to pigments.
5. Conclude the correct role: The most important role of pigments in photosynthesis is to absorb light energy and convert it into chemical energy, which drives the synthesis of glucose in the later stages of photosynthesis.