Biology Bioenergetics SZABMU 2024 Reconduct
PMDC Verified Question 19 of 67
Chlorophyll and accessory pigments absorb light and transfer the energy, that initiates the light reactions. What is the order of energy transfer?
A
Chlorophyll b \(\rightarrow\) Carotenoids \(\rightarrow\) Chlorophyll a
B
Chlorophyll b \(\rightarrow\) Carotenoids \(\rightarrow\) Chlorophyll b
C
Chlorophyll a \(\rightarrow\) Chlorophyll b \(\rightarrow\) Carotenoids
D
Carotenoids \(\rightarrow\) Chlorophyll b \(\rightarrow\) Chlorophyll a
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Carotenoids \(\rightarrow\) Chlorophyll b \(\rightarrow\) Chlorophyll a
Concept:

The photosystem acts like a funnel, gathering light energy from a wide antenna complex and directing it inward to a central reaction center.

Solution:

  • Light is initially absorbed by the outermost accessory pigments (Carotenoids), which absorb broader wavelengths.
  • They pass this excitation energy via resonance to Chlorophyll b.
  • Chlorophyll b funnels the energy inward directly to the reaction center, which is exclusively composed of Chlorophyll a.
  • Therefore, the correct inward vector is: Carotenoids \(\rightarrow\) Chlorophyll b \(\rightarrow\) Chlorophyll a.


Why other options are incorrect:

  • Energy always flows from accessory pigments towards the primary pigment (Chlorophyll a), never outward or in reverse.

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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