Final answer:
The correct reactants for cellular respiration are glucose and oxygen, while those for photosynthesis are carbon dioxide and water. They are interconnected in that the products of one process serve as the reactants for the other.
Step-by-step explanation:
The reactants used in cellular respiration are glucose and oxygen, which are processed in cells to produce energy in the form of ATP, along with carbon dioxide and water as byproducts. The equation representing cellular respiration is: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy (ATP).
For photosynthesis, the reactants are carbon dioxide and water, using the energy from sunlight to produce glucose and oxygen. The equation for photosynthesis is: 6CO2 + 6H2O + Energy → C6H12O6 + 6O2. This process primarily occurs in the chloroplasts of plant cells.
Therefore, the correct answer to the student's question is option 2): Glucose and oxygen in cellular respiration, carbon dioxide and water in photosynthesis. These processes are gaseously interconnected; the oxygen and organic compounds produced during photosynthesis are utilized in cellular respiration, and the carbon dioxide produced during cellular respiration is utilized during photosynthesis.