The diagram shows a summary of photosynthesis.

Question

Which substance is Y?

a
H2O
b
glucose
c
O2
d
CO2

Answer 1

In the process of photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) to produce glucose (C6H12O6) and oxygen (O2). Based on the context of your question and common representations of photosynthesis, the substance Y is likely carbon dioxide (CO2).

So the answer is:

d CO2