Final answer:
The correct sentence is 'Chlorophyll is a chemical found in a chloroplast.' Chlorophyll is the pigment that captures light for photosynthesis, which occurs within the thylakoids of chloroplasts in plants and algae. So the correct option is A
Step-by-step explanation:
The sentence that best describes the relationship between chlorophyll and the chloroplast is: Chlorophyll is a chemical found in a chloroplast. The chloroplast is an organelle within eukaryotic cells such as those of plants and algae, which functions in photosynthesis. This process uses carbon dioxide, water, and light energy to make glucose and oxygen. Within the chloroplasts are interconnected and stacked fluid-filled membrane sacs called thylakoids, where chlorophyll resides and captures light energy for photosynthesis. Chlorophylls are a class of pigments that are vital to the photosynthetic process, with chlorophyll a and b being the primary types found in higher plant chloroplasts.