Golden brown colour of diatoms is due to presence of__________?
Correct answer: C. Fucoxanthin, diatoxanthin, diadinoxanthin
- A. Mycoxanthin, mucoxanthin and myxoxanthophylls
- B. Alpha and beta carotenes and myxoxanthin
- C. Fucoxanthin, diatoxanthin, diadinoxanthin
- D. None of the above
Explanation
Diatoms have golden-brown colour because their plastids contain accessory xanthophyll pigments, especially fucoxanthin, along with diatoxanthin and diadinoxanthin. Students may choose a carotene-containing option because carotenes are also accessory pigments, but it does not give the characteristic diatom pigment combination listed in option c.
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