In metabolic processes, which statement is true about respiration compared to photosynthesis?

• A. Oxygen is a waste product in both
• B. Carbon dioxide is fixed in the form of starch
• C. Oxygen is a waste product in photosynthesis but not respiration
• D. Glucose is produced in both processes

Answer: (C)

The statement that oxygen is a waste product in photosynthesis but not in respiration is accurate. During photosynthesis, plants, algae, and some bacteria convert light energy into chemical energy, producing glucose and releasing oxygen as a byproduct. This occurs in the chloroplasts of plant cells and is essential for life on Earth, as oxygen is released into the atmosphere.

In contrast, respiration is a metabolic process in which organisms, including plants and animals, break down glucose in the presence of oxygen to release energy. The primary byproducts of respiration are carbon dioxide and water, and while oxygen is utilized by organisms during this process, it is not a waste product. In fact, respiration does not release oxygen; rather, it consumes it, making the understanding of these processes crucial in the study of biology and ecology.

This fundamental distinction helps illustrate how photosynthesis and respiration are interdependent processes that support life by cycling matter and energy through ecosystems.