he diagram shows a summary of photosynthesis.

Which substance is Y?

a
H2O
b
CO2
c
O2
d
glucose

b

CO2

Based on the information provided, substance Y in the diagram represents Oxygen (O2).

To determine which substance is represented by Y in the diagram, we can analyze the process of photosynthesis. As a reminder, photosynthesis is the process by which plants, algae, and some bacteria convert sunlight, water, and carbon dioxide into sugar (glucose) and oxygen.

Here's how we can identify substance Y using the given options:

a) H2O (water): Water is one of the raw materials required for photosynthesis, but Y does not represent water in the diagram.

b) CO2 (carbon dioxide): Carbon dioxide is also required for photosynthesis, as it is the source of carbon atoms for the production of glucose. Therefore, Y represents carbon dioxide.

c) O2 (oxygen): During photosynthesis, oxygen is produced as a byproduct, but Y does not represent oxygen in the diagram.

d) Glucose: Glucose is a product of photosynthesis and is synthesized from carbon dioxide and water. However, Y does not represent glucose in the diagram.

Based on this analysis, the substance represented by Y in the diagram is CO2 (carbon dioxide).