Question

Protistian algae include the members like
A) Diatoms
B) Dinoflagellates
C) Euglenoids
D) All of the above

Answer 1

Hint:Protista is a kingdom defined by Whuttaker in 5 kingdom classification as a group of eukaryotic organisms which are single celled or occur in a group of similar cells. Protista include unicellular algae, protozoa and slime moulds.

Complete answer:
Protists having plant-like characteristics are called Protista Algae. They have green pigment called Chlorophyll and also produce their own food by photosynthesis. It is a large group containing diverse organisms.
Let us analyse the options to find the correct answer.
Option A, B and C : Diatoms are unicellular algae. They live in aquatic environments like oceans and in the soil. They are photosynthetic and have a skeleton made of silica shell. Examples include Microalgae. Dinoflagellates are single celled protist algae which live in mainly aquatic environments and perform photosynthesis also. They occupy the phytoplankton group of species in the oceans. They have 2 flagella. Euglenoids are also algae which belong to the kingdom protista. They are unicellular eukaryotes possessing flagella. They are mainly found in freshwater and also perform photosynthesis. In their pigment granules they have carotenoids. Therefore, all three of them are Protists algae.
Option D: Hence, all of the above is the correct option.

Thus, the correct answer is option (D) all of the above.

Note:
i) Protist algae play an important role as the producers in the aquatic ecosystem.
ii) They help in providing food or act as food for other organisms.
iii) Dinoflagellates are also called Red algae. They cause red tide in water bodies.
iv) Diatoms are an important part of the oceanic food web and they also help in carbon fixation.