AICE Marine Science Practice Exam

Marine plants and algae utilize the process of photosynthesis to convert sunlight into energy. During photosynthesis, they absorb light energy using chlorophyll, the green pigment found in their cells. This process occurs mainly in the chloroplasts of these organisms. Photosynthesis involves two primary stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). In the light-dependent reactions, sunlight is captured and converted into chemical energy in the form of ATP and NADPH. Simultaneously, water molecules are split, releasing oxygen as a byproduct. In the light-independent reactions, the chemical energy produced is used to convert carbon dioxide from the atmosphere into glucose, a simple sugar that acts as an energy source for the plant. This process is crucial for marine ecosystems as it not only provides energy for the plants and algae themselves but also forms the foundation of the food web, supporting a wide variety of marine life. The oxygen produced also contributes to the overall oxygen levels in the water, benefiting other organisms that rely on it for respiration. The other processes listed, while significant in their own rights, do not play a direct role in the conversion of sunlight into energy. Cellular respiration is the process by which organisms break down glucose for energy, fermentation is an