Biology Bioenergetics ETEA 2022
PMDC Verified Question 59 of 67
In which part of chloroplast the fixation of carbon dioxide results in the formation of sugars?
A
Grana
B
Stroma
C
Intergranum
D
Outer membrane of chloroplast
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Stroma
Concept:

Carbon fixation via the Calvin cycle requires a specific biochemical environment rich in specific enzymes (like RuBisCO).

Solution:

  • The Calvin cycle takes place in the stroma, which is the dense aqueous fluid surrounding the thylakoids inside the chloroplast.
  • The stroma contains all the necessary soluble enzymes to catalyze the formation of sugars from \( CO_2 \).


Why other options are incorrect:

  • Grana and intergrana (thylakoid structures) are dedicated solely to capturing light and carrying out the light-dependent reactions.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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