Through which life process do decomposers utilize dissolved oxygen in water?

• A. Transpiration
• B. Photosynthesis
• C. Fermentation
• D. Cellular respiration

Answer: (D)

Verified step by step guidance

1. Understand the role of decomposers: Decomposers are organisms, such as bacteria and fungi, that break down dead organic matter into simpler substances. This process releases energy for their survival.
2. Recall the process of cellular respiration: Cellular respiration is the metabolic process by which organisms convert glucose and oxygen into energy (ATP), carbon dioxide, and water. It occurs in the mitochondria of cells.
3. Connect cellular respiration to oxygen usage: Cellular respiration requires oxygen as a reactant in the breakdown of glucose. Decomposers utilize dissolved oxygen in water to perform this process and generate energy.
4. Eliminate incorrect options: Transpiration refers to water movement through plants and evaporation from leaves, which is unrelated to decomposers. Photosynthesis is the process by which plants convert sunlight into energy, not relevant to decomposers. Fermentation is an anaerobic process (does not use oxygen), so it does not involve dissolved oxygen.
5. Conclude that cellular respiration is the correct answer: Decomposers use dissolved oxygen in water to perform cellular respiration, which is essential for their energy production and survival.