WBCS.LIVE practice question

The first stable compound formed in the C4 pathway of photosynthesis is what?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Phosphoglyceric acid (PGA)
  2. Ribulose bisphosphate (RuBP)
  3. Oxaloacetic acid (OAA)
  4. Malic acid

Correct answer and explanation

Correct answer: Oxaloacetic acid (OAA)

Explanation: āœ… Correct Answer: C) Oxaloacetic acid (OAA) šŸ“š Explanation: In the C4 cycle (Hatch-Slack pathway), carbon dioxide is initially accepted by phosphoenolpyruvate (PEP) in the mesophyll cells. This rapid enzymatic reaction produces Oxaloacetic acid (OAA), which is a 4-carbon compound. Because OAA is the very first stable product of this unique fixation process, it is appropriately named the C4 pathway.