Question

“Fire algae" belongs to a group
A. Pyrrophyta
B. Bacillariophyta
C. Euglenophyta
D. Rhodophyta

Answer 1

Hint: Fire algae have a great variety of forms and are single-celled protists. They are single-celled eukaryotes manufactured by the phylum Dinoflagellate. They're little. While many of them are microscopic and range from 15 to 40 microns in size, the largest, Noctiluca, can be as large as 2 mm in diameter.

Complete answer:
Let us look at all the options to get the correct option,
-Pyrrophyta is a unicellular dinoflagellate of reddish-brown with/without a cellulosic cell wall. The bioluminescent algae are dinoflagellates. They have luciferin pigment, which is activated by the luciferase enzyme, causing light production without any heat, hence the name fire algae.
-Euglenophyta are single-cell autotrophic algae that are not bioluminescent and are distinguished by the absence of cell walls and the presence of pellicles.
-Bacillariophyta contains autotrophic unicellular algae (diatoms) with a distinctive silicon cell wall and is responsible for the formation of diatomaceous earth.
-Rhodophyta consists mainly of multicellular algae (red algae) distinguished by the presence in the cell wall of calcium carbonate that forms coral reefs.
Hence, choice A- Pyrrophyta is the correct one.

Note: Fireflies are commonly called algae and are primarily aquatic plankton, but in freshwater habitats, they are also common. Their populations are distributed based on sea surface temperature, salinity, or depth. Although not huge by human standards, these species still have a substantial influence on the environment around them. Many are photosynthetic, use sunlight energy to produce their own food, and provide a food supply to other animals. Some species are able to produce their own light through bioluminescence, which also makes fireflies glow. Certain dinoflagellates are parasites on fish or on other protists.