Which plant cells might not contain any chloroplasts?

• A. Guard cells
• B. Stem cells
• C. Leaf cells
• D. Root cells

Answer: (D)

Verified step by step guidance

1. Understand the function of chloroplasts: Chloroplasts are organelles found in plant cells that conduct photosynthesis, converting light energy into chemical energy stored in glucose.
2. Identify the types of plant cells: The problem mentions guard cells, stem cells, leaf cells, and root cells. Each of these has different functions and locations within the plant.
3. Consider the role of each cell type: Guard cells are involved in gas exchange and are found on leaf surfaces. Stem cells are part of the plant's support and transport system. Leaf cells are primarily involved in photosynthesis. Root cells are responsible for absorbing water and nutrients from the soil.
4. Determine which cells require chloroplasts: Since chloroplasts are essential for photosynthesis, cells that are exposed to light, such as leaf cells and guard cells, will contain chloroplasts. Stem cells may also contain chloroplasts if they are part of green stems exposed to light.
5. Conclude which cells lack chloroplasts: Root cells are typically underground and not exposed to light, so they do not perform photosynthesis and generally do not contain chloroplasts.