Question

Match the following and choose the correct combination from the options given.

	Group Protista		Example
a.	Chrysophytes	i)	Paramecium
b.	Dinoflagelates	ii)	Euglena
c.	Euglenoids	iii)	Gonyaulax
d.	Protozoans	iv)	Diatoms

• A. (a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
• B. (a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
• C. (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
• D. (a) - (ii), (b) - (iv), (c) - (i), (d) - (ii)
• E. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Answer 1

Answer: (E)

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Chrysophytes are protists which include diatoms. These are found both in fresh and marine water. Silica is deposited in the cell walls of diatoms. Silica shells of dead diatoms are nearly indestructible and thus, get accumulated at their habitat and form diatomaceous earth. Diatoms are the chief producers in the ocean.

Dinoflagellates are photosynthetic protists. Gonyaulux is also a dinoflagellate. It undergoes rapid multiplication that they make the sea appear red and cause “red-tide”. Gonyaulax is poisonous to vertebrates. When they are in large number they produce the toxin into the seawater which kills fishes and other aquatic animals.

Euglenoids are freshwater protists found in stagnant water. They lack a cell wall. Though they are photosynthetic in presence of sunlight, when sunlight is absent they behave like heterotrophs by predating on other smaller organisms. Hence, they are also known as mixotrophs. Euglena is an example of euglenoids.

Protozoans are unicellular organisms with heterotrophic nutrition. They are believed to be primitive relatives of animals. Paramoecium is ciliated protozoans present in freshwater or marine. They possess a definite region of ingestion (gullet) and egestion.