Final answer:
The part of plants that absorbs sunlight and carbon dioxide is the chloroplast, which contains chlorophyll. The thylakoids inside the chloroplast contain chlorophyll and absorb sunlight for photosynthesis.
Step-by-step explanation:
The part of plants that contains structures needed to absorb sunlight and carbon dioxide is the chloroplast. The cells inside this structure contain many green organelles called chloroplasts.
Inside each of these organelles are stacks of thylakoids that contain the green pigment chlorophyll that absorbs sunlight needed to power the light-dependent reactions of photosynthesis.