Question

Bio-chemical phase in photosynthesis was first discovered by

• A. Calvin
• B. Blackman
• C. Arnon
• D. Hill

Answer 1

The correct option is A Calvin

Photosynthesis occurs in two stages in a cell. In the first stage, light-dependent reactions capture the energy of light and use it to make the energy-storage and transport molecules ATP and NADPH. The light-independent Calvin cycle uses the energy from short-lived electronically excited carriers to convert carbon dioxide and water into organic compounds that can be used by the organism (and by animals that feed on it). This set of reactions is also called as carbon fixation. The key enzyme of the cycle is called as RuBisCO. The Calvin cycle or reductive pentose phosphate cycle or $C_3$ cycle is a series of biochemical redox reactions that take place in the stroma of chloroplasts in photosynthetic organisms.

The cycle was discovered by Melvin Calvin, James Bassham and Andrew Benson at the University of California, Berkeley by using the radioactive isotope carbon-14.