Photosynthesis doesn't really produce waste products in the same way that cellular respiration does. However, there is one byproduct that is released: oxygen (O2).

Here's why it's not considered waste:

* Essential for life: Oxygen is vital for respiration in most organisms, including plants themselves.

* Not a harmful product: Oxygen is not toxic or harmful to plants.

* Used in other processes: Plants can use oxygen for their own cellular respiration, particularly in the dark.

So, while oxygen is a byproduct of photosynthesis, it's not considered waste because it's essential for life and used in various biological processes.