i did not understand why CO2 concentration is more of a limiting factor for C3 plants - Biology - Photosynthesis in Higher Plants

Question

i did not understand why CO 2
concentration is more of a limiting factor for C
3 plants ??

Shivali · Accepted Answer

In C3 plants,the primary acceptor of CO2 is RUBP This
reaction is catalyzed by enzyme known as RUBisCO RuBisCO is the
most abundant enzyme & is characterized by the fact that its
active site can bind to both CO2 and O2 The
relative concentration of O2 and CO2
determines that which of the two will bind to the enzyme If the
concentration of CO2 decreases, then O2 binds
to RuBisCO As a result,the RUBP instead of being converted to 2
molecules of PGA, binds with O2 to form one molecule of
PGA and phosphoglycolate, This process is known as photo
respiration Hence, in order to bind with enzyme RuBisCO,
CO2 should be present in higher concentration

i did not understand why CO 2 concentration is more of a limiting factor for C 3 plants. ??

i did not understand why CO ₂ concentration is more of a limiting factor for C ₃ plants. ??