Question

Algae used by Calvin and associates for photosynthetic research is

• A. Chlorella
• B. Chlamydomonas
• C. Volvox
• D. All the above

Answer 1

Answer: (A)

Melvin Calvin used radioactive ¹⁴C in algae to study photosynthesis and his studies led to the discovery that the first CO₂ fixation product was a 3-carbon organic acid. He also contributed to working out the complete biosynthetic pathway and hence it was called the Calvin cycle. Calvin used isotopes ${}^{14}C$ in chlorella for knowing the carbon path in photosynthesis.