How many major chlorophylls are there, apart from the related prokaryotic molecule?
ATwo major chlorophylls
BThree major chlorophylls
CFour major chlorophylls
DFive major chlorophylls
Answer & Solution
Correct answer: D. Five major chlorophylls
1. There are five major chlorophylls, labelled a, b, c and d.
2. A related molecule found in prokaryotes is called bacteriochlorophyll.
3. Only chlorophyll a and chlorophyll b are found in higher plant chloroplasts.
4. Answering two counts just the pair present in higher plants and misses the wider set.
5. The prokaryotic molecule is described as related rather than as one of the plant chlorophylls.
6. Counting the labelled letters alone gives four, which is the other easy slip here.
_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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