Many organisms undergo both photosynthesis and cellular respiration, primarily those that contain chlorophyll and have access to sunlight. This includes plants, algae, and some bacteria.
Plants are the most obvious examples. They use photosynthesis to convert sunlight into energy, taking in carbon dioxide and releasing oxygen as a by-product. During the night or in the absence of sunlight, plants switch to cellular respiration, a process where they convert the stored energy from glucose back into usable energy in the form of ATP.
Algae, similar to plants, can perform photosynthesis and are vital components of aquatic ecosystems. They use sunlight to create their food and, when necessary, engage in cellular respiration to break down sugar for energy.
Some bacteria, like cyanobacteria, also have the capability to photosynthesize. They play an essential role in various ecosystems and contribute to the global carbon cycle by converting solar energy into organic compounds while also undergoing respiration for energy release when needed.
In summary, the key organisms that perform both photosynthesis and cellular respiration are primarily plants, algae, and certain bacteria, allowing them to adapt to various environmental conditions and energy needs.