Question

what could letter z be? choose 2 answers letter z could be carbon dioxide because a. it is produced in cellular respiration and is a reactant of photosynthesis. letter z could be a water molecule b. because it is produced in cellular respiration and is a reactant of photosynthesis. letter z could be a water molecule c. because it is produced in photosynthesis and is a reactant of cellular respiration. letter z could be a glucose molecule d. because it is produced in photosynthesis and is a reactant of cellular respiration. letter z could be an oxygen molecule e. because it is produced in cellular respiration and is a reactant of photosynthesis.

Explanation:

• For option A: Cellular respiration produces $\ce{CO_2}$, and photosynthesis uses $\ce{CO_2}$ as a reactant. So Z could be $\ce{CO_2}$.
• For option B: Cellular respiration produces water, and photosynthesis uses water as a reactant. So Z could be a water molecule.
• Option C: Photosynthesis produces oxygen, not water, as a main product (water is a reactant and by - product in some steps but the logic here is reversed). So C is wrong.
• Option D: Glucose is produced in photosynthesis and used in cellular respiration, but the diagram likely shows gas or small molecule exchange between organelles (mitochondria and chloroplast), glucose is a larger molecule and not exchanged in the same way as gases/water. So D is less likely.
• Option E: Oxygen is produced in photosynthesis, not cellular respiration. So E is wrong.

Answer:

A. it is produced in cellular respiration and is a reactant of photosynthesis.
B. because it is produced in cellular respiration and is a reactant of photosynthesis.