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Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYPhotosynthesis in Higher Plants3 Marks
Question
Mention the steps involved in $\mathrm{C}_4$ pathway/ Hatch and Slack pathway starting from atmospheric $\mathrm{CO}_2$ to its entry into the $C_3$ cycle.
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Answer

  • The atmospheric $\mathrm{CO}_2$ entering the leaf is fixed by phosphoenol pyruvate (PEP), a 3C compound in the mesophyll cells, into a 4C compound, oxaloacetic acid (OAA) catalysed by the enzyme, PEP carboxylase (PEP case).
  • It is converted into malic or aspartic acid in the mosophyll cells and then is transported into the bundle sheath cells.
  • In the bundle sheath cells, malic acid is decarboxylated, i.e. it is broken down into a 3C compound, pyruvate with the release of $\mathrm{CO}_2$.

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