No, there is a direct relation between PS and Co2. The rate of increase in net photosynthesis with increase in ambient CO2 concentration.

Dear Muhammad Faheem Jan

But in the optimum conditions, the high rate of photosynthesis causes faster consumption of CO2.

what about co2 compensation piont?

In the case of C3 crop in greenhouse condition

No opposite relationship between PS and carbon dioxide, when PS increase then carbon dioxide increase i.e. direct relationship between them.

Hello Dr. J. M. Koli

Some studies have shown that it is reduced Because in photosynthesis, CO2 is consumed.