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In the five-kingdom system of classification, which single kingdom out of the following can include blue green algae, nitrogen-fixing bacteria and methanogenic archaebacteria?

1. Fungi
2. Plantae
3. Protista
4. Monera

Correct answer: Monera

Solution

Monera is the kingdom that contains all prokaryotic organisms in the five-kingdom system. Blue-green algae (cyanobacteria), nitrogen-fixing bacteria, and methanogenic archaebacteria are all prokaryotes, so they belong there.

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