Correct Answer: 4

Solution : The correct option is 4

There are four main categories of microorganisms:

• Bacteria are single-celled microorganisms with no nucleus and no membrane-bound organelles.
• Algae are water-bound, photosynthetic, nucleus-bearing organisms that lack genuine roots, stems, and leaves.
• Fungi are eukaryotic microorganisms such as yeasts, moulds, and mushrooms.
• Protozoa are eukaryotic microorganisms that do not belong to any other kingdom.