Kingdom-Protista includes all unicellular eukaryotic organisms like flagellates, diatoms, dinoflagellate, slime mould, sarcodina, etc. Fungi represents a group of eukaryotic, achlorotrophic organisms of diverse forms, sizes, physiology and mode of reproduction. The members of Archaea (Archaebacteria) are prokaryotes and include the extreme halophiles, the thermoacidophiles and the methanogens.

Monera is the kingdom that in older clasifications contains all prokaryotes.

Desmids are called golden algae or golden-brown algae because they have a characteristic golden colour imparted by a pigment fucoxanthin and by the use of oil droplets which serve as food reserves.

Red tides are caused by red dinoflagellates(Gonyaulax)that multiply rapidly . Due to their large numbers, the sea appears red in colour. They release large amounts of toxins in water that can cause death of a large number of fishes.

Protists, Fungi and Plantae have nuclear membrane but Monera does not have nuclear membrane. Monera are considered as the most primitive group of organisms. This includes various types types of bacteria and blue-green algae. Nuclear membrane is absent in monera.

-Chrysophytes includes diatoms ,desmids

-dinoflagellate includes gymnodium, gonyaulax ,noctiula..

-euglenoids includes euglena

-protozoans includes amoeba,paramecium,trypanosoma etc..

hence correct answer is A..

A coccus (plural cocci) is any bacterium or archea on that has a spherical, ovoid, or generally round shape. It is one of the three distinct bacterial shapes, the other two being bacillus (rod-shaped) and spiral-shaped cells.

Prokaryotic cells are cells that do not have a true nucleus or most other cell organelles. Organisms that have prokaryotic cells are unicellular and called prokaryotes. Bacteria and archaea are prokaryotes. Prokaryotic cells can be contrasted with eukaryotic cells, which are more complex.

Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms. Multicellular organisms arise in various ways, for example by cell division or by aggregation of many single cells.

Thermoacidophiles is the right answer,as the name indicates Thermo for high temperature, and acido for the presence of acidity these bacterias are found in hot springs. While methanogens are bacterias that are found in marshy areas and in guts of ruminant animals and produce methane.halophiles are the bacterias found in salty areas.

The five-kingdom system was developed by Robert H. Whittaker in 1969 and was built on the work of previous biologists such as Carolus Linnaeus.