I think both @Hufsa & @plantnoobdude are right and potentially they do, but only if we assume <"that PAR"> is above <"light compensation point">.But if you add higher levels of CO2 do the plants also need more nutrients?
If @Hufsa had posted that ten minutes earlier it would have saved me a lot of searching and typing. If they had posted it ten minutes later, I would have already written something pretty similar (but probably in less coherent English).I would say yes. If your plants were somewhat limited in growth by CO2 (carbon is the nutrient the plants need the most of), then increasing the availability of that nutrient will make another nutrient, like say nitrogen, the limiting factor.
As long as your plants are not light limited then more CO2 will increase demand for other nutrients (macros micros).
I will aspire to do better next timeIf @Hufsa had posted that ten minutes earlier it would have saved me a lot of searching and typing.