Question

Why we exhale CO2 only and why plants exhale O2 during the photosynthesis?

Answer 1

Answer:

Because We Do Process Like This

FROM FOOD C6H12O6+12O2------)6H2O+6CO2+energy

And Plants Do like this

6H2O+6CO2-----)C6H12O6+6O2

Answer 2

Answer:

O2 being a byproduct of photosynthesis is given out by plants while the process is still on. We inhale the air and exhale carbon dioxide keeping the oxygen because of its importance in respiration.

Co2 is used by plants in photosynthesis and O2 used by us for producing energy from food. So they exhale O2 during photosynthesis and we exhale Co2.