Final answer:
Chlorophyll is the pigment found in plant leaves and cyanobacteria that enables them to conduct photosynthesis, capturing light energy to produce glucose.
Step-by-step explanation:
The pigment present in plant leaves and in cyanobacteria that allows them to perform photosynthesis is chlorophyll. In both cyanobacteria and plants, chlorophyll is crucial for harnessing light energy to convert carbon dioxide and water into glucose during photosynthesis. Notably, cyanobacteria contain chlorophyll a and also have additional pigments such as phycocyanin, which contribute to their blue-green color and assist them in capturing light energy for photosynthesis. In plants, chlorophyll is located within organelles called chloroplasts, where it performs the same essential function.