Mitochondria are not present in :-

The correct answer is (b), bacteria. Mitochondria are organelles found in eukaryotic cells that are responsible for energy production. They are not found in prokaryotic cells, such as bacteria.

Algae are eukaryotes, so they do have mitochondria. Fungi are also eukaryotes, so they have mitochondria as well. Protozoa are a diverse group of eukaryotes, and some do have mitochondria while others do not.

Here is a more detailed explanation of each option:

• Option (a), algae, are eukaryotes. Eukaryotes are cells that have a nucleus and other organelles. Mitochondria are one type of organelle that is found in eukaryotic cells. They are responsible for energy production.
• Option (b), bacteria, are prokaryotes. Prokaryotes are cells that do not have a nucleus or other organelles. Mitochondria are not found in prokaryotic cells.
• Option (c), fungi, are eukaryotes. Eukaryotes are cells that have a nucleus and other organelles. Mitochondria are one type of organelle that is found in eukaryotic cells. They are responsible for energy production.
• Option (d), protozoa, are a diverse group of eukaryotes. Some protozoa do have mitochondria, while others do not. The presence or absence of mitochondria is one of the ways that protozoa are classified.