alleryStart learning →Which pigment sits in the reaction centre that a photon reaches after striking the antenna pigments of photosystem II?
AChlorophyll a
BChlorophyll b
CBeta-carotene
DPlastocyanin
Answer & Solution
Correct answer: A. Chlorophyll a
1. A photon strikes the antenna pigments of photosystem II to initiate photosynthesis.
2. The energy travels to the reaction centre that contains chlorophyll a.
3. From there it drives the electron transport chain, which pumps hydrogen ions into the thylakoid interior.
4. Chlorophyll b is an accessory pigment and does not perform the photochemistry itself.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.2 The Light-Dependent Reactions of Photosynthesis_
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