Question

The phenomenon of red tides in the sea is caused by

• A. Dinoflagellates
• B. Red algae
• C. Dead bacteria
• D. Fungi

Answer 1

The correct option is A

Dinoflagellates

The correct option is A

Explanation for the correct option:

Option A:

1. Dinoflagellates are the reason behind red tides.
2. The term "red tide" is used to describe an algal bloom, which is a phenomenon that occurs when there are high concentrations of aquatic microorganisms and the bloom turns red or brown.
3. Red tides are conditions where freshwater, marine, or estuarine algae rapidly build up in the water column and color the surface water.
4. Coastal regions are where it typically occurs.

Explanation for the incorrect options:

Option B:

1. Red algae, also known as Rhodophyta, are the earliest kind of eukaryotic algae and are a distinctive variety of species that are typically found in freshwater lakes.
2. They are red in color because they contain the pigments phycocyanin, phycoerythrin, and chlorophyll a.

Option C:

1. They are recycled, is the response. Single-celled organisms often go through a process termed lysis, in which the cell membrane dissolves, as they die, in contrast to bigger creatures.
2. The cytoplasm, ribosomes, and DNA of the bacteria leak out as it ruptures.

Option D:

1. Fungi—which also include yeasts, rusts, smuts, mildews, molds, and mushrooms—that have been identified as fungi.
2. Additionally, there are several fungus-like species that do not actually belong to the kingdom of Fungi but are frequently referred to as fungi, such as slime molds and oomycetes (water molds).

Final answer: The phenomenon of red tides in the sea is caused by dinoflagellates.