co2+h2o=glucose in plants but then how is it possible that carbonic acid is made when co2 and h2o react?

In plants glucose is made when co2 and h2o react but then how can carbonic acid is produced when h2o and co2 react but is not found in plants?

6CO2 +6H2O—> C6H12O6 + 6O2
This reaction, photosynthesis occurs in plants with the help of sunlight and chlorophyll in the chloroplasts. It is a means of trapping sunlight energy. Enzymes are needed.

CO2 dissolving in H2O forming a weak acid is not the same reaction. Only plants can make sugar. CO2+H2O—>H2CO3 The reaction is found in soda pop.

There are other reactions between elements where more than one compound can be made. The law of multiple proportions.

Calvin Cycle Song- Biology Extra Credit