(i) CO2 acceptor in C4 cycle is phosphoenol pyruvic acid.
(ii) The first stable compound in the C4 cycle is oxaloacetic acid.
(iii) A cycle occurs at low concentrations of CO2 (0.1-1.0 ppm).
(iv) This cycle occurs at high temperature (32-450C).
(v) The cycle occurs in mesophyll and bundlesheath chloroplasts.
(vi) It occurs in high light.
(vii) It occurs mainly in plants of tropical countries.
(viii) C4 cycle C4 occurs in plants.
(ix) The CO2 fixing enzyme in this cycle is carboxylase.
(x) Plants in cycle A have higher rate of photosynthesis.