Tag: biology

Questions Related to biology

Proterospongia is considered connecting link between protists and sponges/metazoa due to

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Colonial nature

  2. Choanocyte type of individual

  3. Sponge-like nature

  4. All of the above

Show answer
Correct Option: A

Identify the characteristic features of diatoms.

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Cell wall is made of cellulose, floating on water and produce auxospores.

  2. Cell wall is made of chitin, fixed forms and produce auxospores.

  3. Cell wall is made of silica, floating on water and produce auxospores.

  4. Cell wall is made of silica, symbionts and produce zoospores..

Show answer
Correct Option: C
Explanation:

Diatoms are the organisms belonging to Chrysophytes of kingdom Protista. Diatoms occur in all aquatic and moist terrestrial habitats. They may be free floating or bottom dwellers. The free-floating forms remain suspended on the surface of water by mucilage secretion and presence of lightweight lipids. The cell wall is made of silica which is known as frustule. The frustule is made up of two valves, epitheca, and hypotheca. The two valves fit together like a soapbox. They produce auxospores. Auxospore is a rejuvenescent cell which is a zygote grown in size.

Which of the following is not a character of protista?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Protists are eukaryotic.

  2. Some protists have cell walls.

  3. Their mode of nutrition is both autotrophic and heterotrophic.

  4. They have a nucleoid.

Show answer
Correct Option: D
Explanation:
Protists are microscopic organisms. The cell structure is eukaryotic. It is surrounded by plasmalemma (cell membrane). There may be an outer covering of pellicle, cuticle. shell or cellulose wall. It contains organelles like mitochondria, golgi complex, endoplasmic reticulum, 80s ribosomes, etc. Protista have both modes of nutrition, autotrophic as well as heterotrophic.
Nucleoid is the genetic material of prokaryotes. It is not present in a protista.

When a freshwater protozoan is placed in marine water

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. The contractile vacuoles become bigger in size

  2. The number of contractile vacuoles increases

  3. The contractile vacuoles disappear

  4. The contractile vacuoles remain unchanged

Show answer
Correct Option: C
Explanation:

When a freshwater protozoan is placed in marine water, the contractile vacuoles disappear. The function of contractile vacuole is to remove the excess water outside by the process of osmoregulation. In marine water, it is necessary to retain the water inside the body instead of out expelling it out. If contractile vacuoles will not disappear, the cell will get dehydrated.

Thus, the correct answer is option C.

Select the incorrect match:

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Protista: Membrane bound cell organelles present; Monera: Membrane bound cell organelles absent

  2. Protista: Nucleus present; Monera: Nucleus absent

  3. Protista: Flagella is made of flagellin protein; Monera: Flagella is made of rubulin protein

  4. Protista: Cell wall if present, is cellulosic; Monera: Cell wall is made pf peptidogylcan

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Correct Option: A

A Protistan which is commonly called plant-animal is?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Navicula

  2. Noctiluca

  3. Vorticella

  4. Euglena

Show answer
Correct Option: D
Explanation:
  • Euglena is a protist that can both eat food and can photosynthesize. When acting as a heterotroph, the Euglena surrounds a particle of food and consumes it by phagocytosis. When acting as an autotroph, the Euglena utilizes chloroplasts to produce sugars by photosynthesis that's why it is said to be a plant-animal.
  • Hence A Protistan which is commonly called plant-animal is Euglena.
  • So, the correct answer is 'Euglena'.

Sex first originated in 

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Protistans

  2. Simple algae

  3. Angiosperms

  4. Both (1) and (2)

Show answer
Correct Option: D
Explanation:

(A)Protista are simple eukaryotic organisms that cannot be classified as plant, animal or fungus. They are mostly unicellular, but some are multicellular. They are first originated.

(B)Algae are group of photosynthetic organisms. They may be unicellular or multicellular. They are found in swampy areas, ponds, ditches, etc.They lack distinct organs. They were evolved after protista.
(C)Angiosperms are the vascular living plants which have true roots, stems, and leaves. They are flowering plants. Their reproductive structures are flowers.
So, the correct option is 'Both (1) and (2)'.

Single celled eukaryotes are included in Kingdom.

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Protista

  2. Fungi

  3. Plantae

  4. Monera.

Show answer
Correct Option: A
Explanation:

A protist is any eukaryotic organism (one with cells containing a nucleus) that is not an animal, plant or fungus. The protists do not form a natural group, or clade, since they exclude certain eukaryotes; but, like algae or invertebrates, they are often grouped together for convenience. In some systems of biological classification, such as the popular five-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues".


So the correct option is 'Protista'.

Complete the analogy
Rhizobium : Bacteria : : Diatoms:........................

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Fungus

  2. Protozoa

  3. Bacreria

  4. Algae

Show answer
Correct Option: D
Explanation:

Rhizobium : Bacteria :: Diatoms : Algae

Diatoms are algae that live in houses made of glass they are single-celled algae. 
So, the correct option is 'Algae'.

Cell wall plates are found in cell wall of

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Diatoms

  2. Dinoflagellates

  3. Both (1) & (2)

  4. Euglenoids

Show answer
Correct Option: B
Explanation:

A.Diatoms – cell wall is made up of silica and cellulose.

B.Dinoflagellates – cell wall is made up of cellulose and is present in the form of plates.

D.Euglenoids – cell wall is absent.

So, the correct option is ‘Dinoflagellates’.