College Biology Placement Practice Test 2026 - Free Biology Placement Practice Questions and Study Guide

Photosynthesis is primarily used for synthesizing foods using sunlight. This process occurs in the chloroplasts of plant cells, where chlorophyll absorbs sunlight to convert carbon dioxide from the air and water from the soil into glucose and oxygen. The glucose produced serves as a vital energy source for the plant and is also used to create other necessary organic compounds. This transformation of light energy into chemical energy is fundamental not only for plants but also supports life on Earth by providing food for herbivores and, subsequently, for carnivores. The oxygen released during photosynthesis is also essential for the survival of aerobic organisms, including humans.