Correct option is A
Explanation:
Statement A: Malate synthesized from oxaloacetate in mesophyll cells is transported to bundle sheath cells.
- This is correct. In C4 photosynthesis, malate is synthesized from oxaloacetate in mesophyll cells and is then transported to the bundle sheath cells. This process is a key feature of the C4 carbon fixation pathway.
Statement B: Pyruvate formed in the bundle sheath cells is transported to mesophyll cells.
- This is correct. After malate undergoes decarboxylation in the bundle sheath cells, pyruvate is produced. This pyruvate is then transported back to the mesophyll cells where it is used to regenerate oxaloacetate.
Statement C: Aspartate synthesized from oxaloacetate in mesophyll cells is transported to the bundle sheath cells and again gets converted into oxaloacetate.
- This is incorrect. While aspartate can be synthesized from oxaloacetate, it is typically not the key molecule involved in the C4 pathway in mesophyll cells. The focus is on malate and pyruvate in this context, not aspartate.
Statement D: Alanine aminotransferase converts pyruvate into alanine in the bundle sheath cells.
- This is incorrect. Alanine aminotransferase converts pyruvate into alanine in certain cells, but pyruvate in the bundle sheath cells is used primarily in the regeneration of oxaloacetate, not converted into alanine.
Statement E: Oxaloacetate is converted into aspartate, by aspartate aminotransferase in the mesophyll cell.
- This is incorrect. While oxaloacetate can be converted into aspartate, the key molecule in C4 photosynthesis is malate, which is directly involved in CO2 fixation in mesophyll cells. The aspartate pathway is not the focus here.
