What is a key derivative of photosynthesis in plants?

The key derivative of photosynthesis in plants is glucose. During photosynthesis, plants convert light energy, typically from the sun, into chemical energy stored in glucose molecules. This process involves taking in carbon dioxide from the atmosphere and water from the soil, using sunlight to drive the conversion of these substances into glucose and oxygen.

While oxygen is indeed a byproduct of photosynthesis that is released into the atmosphere, glucose serves as the primary source of energy and a fundamental building block for plant growth. Plants rely on glucose for cellular respiration, which allows them to convert that stored energy into a form they can use for metabolic processes.

In the context of the other options, carbon dioxide and water are reactants rather than derivatives. They're necessary inputs for the photosynthesis process but do not represent the end product. Oxygen, although a significant output, does not serve the same fundamental role as glucose does in supporting plant growth and energy needs. Therefore, glucose is the correct answer as the key derivative of photosynthesis.