Question

If light is cut and CO2 supply is continued then which of these will get disappeared from photosynthesizing algal cells? RUDP PGAL RUMP PGA

Answer 1

i think answer will be PGAL. Because if the light is cut light reaction will be stopped and there will be no ATP and NADPH2, and in stroma (Dark reaction) RUDP accepts CO2 and forms unstable compound which breaks into 2,3PGA compounds (therefore it has to be present). For the formation of PGAL, NADPH2 is required.

Answer 2

Explanation:

A. RUDP or Ribulose-diphosphate is the protein that combines with carbon dioxide to form phosphoglyceraldehyde during carbon fixation.

B. PGAL or Phosphoglyceraldehyde is an intermediate in various metabolic pathways.

C. RUMP or Ribulose-monophosphate combines with ATP to form Ribulose-diphosphate which is required in dark reaction of photosynthesis during carbon fixation

D. PGA or Phosphoglyceric Acid is a three carbon compound which s the first stable product of Calvin cycle.

Hence, if light is cut and CO2 supply is continued, then RUDP will get disappeared from photosynthesising algal cells because it will combine with CO2 to form intermediates of C3 cycle of carbon fixation.

So, the correct answer is 'RUDP'.