Which of the following is not among the 3 main classes of Algae?

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Q: 203 (SSC/NA)

Which of the following is not among the 3 main classes of Algae?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,10,1,0,0,1,10

keywords: 

{'chlorophyceae': [2, 0, 0, 0], 'phaeophyceae': [2, 0, 0, 0], 'algae': [2, 0, 0, 0], 'rhodophyceae': [2, 0, 0, 0], 'main classes': [1, 0, 0, 0], 'gymnosperms': [1, 0, 0, 0]}