Biology Bioenergetics ETEA 2023
PMDC Verified Question 39 of 67
Light reaction occurs in the _ of chloroplast:
A
Outer membrane
B
Inner membrane
C
Granum
D
Stroma
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Granum
Concept:

The light reactions heavily depend on photosystems, which are large protein-pigment complexes requiring a specific membrane structure.

Solution:

  • These photosystems are densely packed into the thylakoid membranes.
  • A stack of thylakoid membranes is called a granum.
  • Therefore, the grana are the precise structural locations where light energy is absorbed and converted into chemical energy.


Why other options are incorrect:

  • The outer and inner membranes of the chloroplast simply serve as protective and selective boundaries.
  • The stroma is the fluid site of the dark 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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