Plants of the C4 family lack the enzyme RuBisCo. Bundle-sheath cells surround vascular bundles rather than contain this protein. As a result, in plants with C4 cells, Calvin cycles do not take place in bundle-sheath cells. CO2 is mainly accepted into cells of the mesophyll by phosphoenol pyruvate, which is a three - carbon compound. In this reaction, it is transformed into oxaloacetic acid (OAA), a four-carbon compound. Further conversion of OAA to malic acid occurs. The Calvin cycle links malic acid to CO2 by decarboxylation in bundle-sheath cells. RuBisCo can no longer function as an oxygenase because of this.Answered by Abhisek | 11 months ago
Figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:
(a) At which point/s (A, B or C) in the curve is light a limiting factor?
(b) What could be the limiting factor/s in region A?
(c) What do C and D represent on the curve?