What is the green matter in plant leaves called?

The green matter in plant leaves is called chlorophyll, which is a vital pigment found in the chloroplasts of plant cells. Chlorophyll plays a crucial role in photosynthesis, the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen. The green color of chlorophyll allows plants to absorb light most effectively at specific wavelengths, primarily in the blue and red parts of the light spectrum, while reflecting green light. This is why leaves appear green to the human eye.

The other options, while related to plant biology, do not refer to the green pigment. Fiber is a structural component of plant cell walls, glucose is a simple sugar produced during photosynthesis, and starch is a storage form of energy in plants. These substances are important for various plant functions but do not represent the green matter specifically found in leaves.