What type of organism predominantly contains chloroplasts?

Chloroplasts are organelles found primarily in plant cells and certain protists, such as algae. They are responsible for photosynthesis, a process that converts light energy into chemical energy in the form of glucose. This ability to perform photosynthesis is a characteristic feature of autotrophs, which are organisms that can produce their own food using light, water, carbon dioxide, and other substances.

In addition to autotrophs, many protists (particularly those that are plant-like, such as diatoms and green algae) also contain chloroplasts, enabling them to carry out photosynthesis as well. Thus, the correct choice emphasizes that chloroplasts are predominantly found in both autotrophs and specific protists, highlighting the essential role of these organelles in energy production within the respective organisms.

While fungi, heterotrophs, and bacteria may play important roles within their ecosystems, they do not rely on chloroplasts to produce food through photosynthesis. Fungi are primarily decomposers, heterotrophs obtain their energy by consuming other organisms, and while some bacteria can photosynthesize, they do not possess chloroplasts; instead, they have photosynthetic pigments located in their membranes. This distinction clarifies why the focus on