1000+ Biological Classification MCQ for IBPS SO [Solved]
Thursday 9th of March 2023
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1. Identify the basis of classification of fungi into phycomycetes, ascomycetes, basidiomycetes and deuteromycetes.
i. Fruiting bodies
ii. Nature of habitat
iii. Morphology of mycelium
iv. Mode of spore formation
A. i & ii only
B. ii & iii only
C. i, ii, & iv only
D. All of these
Answer : C
i. Fruiting bodies
ii. Nature of habitat
iii. Morphology of mycelium
iv. Mode of spore formation
A. i & ii only
B. ii & iii only
C. i, ii, & iv only
D. All of these
Answer : C
2. Protists are
A. single-celled eukaryotes.
B. multicellular eukaryotes.
C. single-celled prokaryotes.
D. single-celled akaryote.
Answer : A
A. single-celled eukaryotes.
B. multicellular eukaryotes.
C. single-celled prokaryotes.
D. single-celled akaryote.
Answer : A
3. Plasmogamy is the fusion of
A. two haploid cells including their nuclei.
B. two haploid cells without nuclear fusion.
C. sperm and egg.
D. sperm and two polar nuclei.
Answer : B
A. two haploid cells including their nuclei.
B. two haploid cells without nuclear fusion.
C. sperm and egg.
D. sperm and two polar nuclei.
Answer : B
4. The symbiotic association of fungi and algae is called
A. lichen
B. mycorrhiza
C. rhizome
D. endomycorrhiza
Answer : A
A. lichen
B. mycorrhiza
C. rhizome
D. endomycorrhiza
Answer : A
5. Mycorrhizae are useful for plants because they
A. fix atmospheric nitrogen.
B. enhance absorption of nutrients from the soil.
C. kill insects and pathogen.
D. provide resistance against abiotic stresses.
Answer : B
A. fix atmospheric nitrogen.
B. enhance absorption of nutrients from the soil.
C. kill insects and pathogen.
D. provide resistance against abiotic stresses.
Answer : B
6. Which of the following pair is correctly matched ?
A. Fungi Saprophytic parasitic mode of nutrition.
B. Monera Nuclear membrane is present.
C. Plantae Cell wall is made up of cellulose.
D. Animalia Cell wall is absent.
Answer : B
A. Fungi Saprophytic parasitic mode of nutrition.
B. Monera Nuclear membrane is present.
C. Plantae Cell wall is made up of cellulose.
D. Animalia Cell wall is absent.
Answer : B
7. Bacteria and yeast are similar in all the following features except that
A. both are unicellular.
B. both are prokaryotes.
C. both are capable of causing fermentation.
D. both produce spores.
Answer : B
A. both are unicellular.
B. both are prokaryotes.
C. both are capable of causing fermentation.
D. both produce spores.
Answer : B
8. Which of the following statements regarding cyanobacteria is incorrect?
A. It is also called blue green algae.
B. They are chemosynthetic autotrophs.
C. It forms blooms in polluted water bodies.
D. It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Answer : B
A. It is also called blue green algae.
B. They are chemosynthetic autotrophs.
C. It forms blooms in polluted water bodies.
D. It is unicellular, colonial or filamentous, marine or terrestrial bacteria.
Answer : B
9. A fungus contains cells with two nuclei from different genomes. The nuclei do not fuse but divide independently and simultaneously as new cells are formed. This fungus belongs to
A. phycomycetes
B. zygomycetes
C. deuteromycetes
D. basidiomycetes
Answer : D
A. phycomycetes
B. zygomycetes
C. deuteromycetes
D. basidiomycetes
Answer : D
10. Which one single organism or the pair of organisms is correctly assigned to its taxonomic group?
A. Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
B. Lichen is a composite organism formed from the symbiotic association of an alga and a protozoan.
C. Yeast used in making bread and beer is a fungus.
D. Nostoc and Anabaena are examples of protista.
Answer : C
A. Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
B. Lichen is a composite organism formed from the symbiotic association of an alga and a protozoan.
C. Yeast used in making bread and beer is a fungus.
D. Nostoc and Anabaena are examples of protista.
Answer : C
11. Which group of fungi is commonly known as imperfect fungi ?
A. Phycomycetes
B. Ascomycetes
C. Basidiomycetes
D. Deuteromycetes
Answer : D
A. Phycomycetes
B. Ascomycetes
C. Basidiomycetes
D. Deuteromycetes
Answer : D
12. Match the terms given in column-I with their examples given in column-II and choose the correct option
A. A II, B III, C IV, D V, E I
B. A I, B II, C III, D V, E IV
C. A II, B V, C III, D I, E IV
D. A II, B III, C IV, D I, E V
Answer : D
| Column-I | Column-II |
|---|---|
| (Terms) | (Examples) |
| A. Ascus | I. Spirulina |
| B. Basidium | II. Penicillium |
| C. Protista | III. Agaricus |
| D. Cyanobacteria | IV. Euglena |
| E. Animalia | V. Sponges |
A. A II, B III, C IV, D V, E I
B. A I, B II, C III, D V, E IV
C. A II, B V, C III, D I, E IV
D. A II, B III, C IV, D I, E V
Answer : D
13. A virus can be considered a living organism because it
A. responds to touch stimulus
B. respires
C. reproduces (inside the host)
D. can cause disease
Answer : C
A. responds to touch stimulus
B. respires
C. reproduces (inside the host)
D. can cause disease
Answer : C
14. Which of the following statement is correct for both bluegreen algae and bacteria ?
A. Both show anaerobic respiration.
B. Both have chlorophyll pigment.
C. Both are devoid of true nucleus.
D. None of the above
Answer : C
A. Both show anaerobic respiration.
B. Both have chlorophyll pigment.
C. Both are devoid of true nucleus.
D. None of the above
Answer : C
15. Match column I with column II and choose the correct option.
A. A-(i) B-(ii) C-(iii) D-(iv) E-(v)
B. A-(iii) B-(v) C-(ii) D-(iv) E-(i)
C. A-(iii) B-(i) C-(v) D-(ii) E-(iv)
D. A-(v) B-(iv) C-(iii) D-(i) E-(ii)
Answer : D
| Column I | Column II |
|---|---|
| A. Mycoplasma | (i) Nitrogen fixing cells |
| B. Decomposers | (ii) Blue green algae |
| C. Methanogens | (iii) Production of methane |
| D. Heterocysts | (iv) Most abundant heterotrophs |
| E. Cyanobacteria | (v) Pathogenic in plants and animals |
A. A-(i) B-(ii) C-(iii) D-(iv) E-(v)
B. A-(iii) B-(v) C-(ii) D-(iv) E-(i)
C. A-(iii) B-(i) C-(v) D-(ii) E-(iv)
D. A-(v) B-(iv) C-(iii) D-(i) E-(ii)
Answer : D
16. Match the class of fungi given in column I with their examples given in column II and choose the correct option
A. A IV, B III, C I, D II
B. A II, B III, C IV, D I
C. A IV, B I, C II, D III
D. A III, B IV, C II, D I
Answer : B
| Column-I | Column-II |
|---|---|
| (Class of fungi) | (Examples) |
| A. Ascomycetes | I. Rhizopus |
| B. Basidiomycetes | II. Penicillium |
| C. Deuteromycetes | III. Ustilago |
| D. Phycomycetes | IV. Alternaria |
A. A IV, B III, C I, D II
B. A II, B III, C IV, D I
C. A IV, B I, C II, D III
D. A III, B IV, C II, D I
Answer : B
17. An X reproduces in such a great numbers that the water may appearred, producing a red tides and kills large marine animals like Z. X belongs to Y. Identify X, Y and Z.
A. X - Gonaulax ; Y - Dinoflagellates; Z - Fishes
B. X - Paramecium ; Y - Protozoa ; Z - Crocodiles
C. X - Trypanosoma ; Y - Protozoa ; Z - Frogs
D. X - Plasmodium ; Y - Euglenoids ; Z - Oysters
Answer : A
A. X - Gonaulax ; Y - Dinoflagellates; Z - Fishes
B. X - Paramecium ; Y - Protozoa ; Z - Crocodiles
C. X - Trypanosoma ; Y - Protozoa ; Z - Frogs
D. X - Plasmodium ; Y - Euglenoids ; Z - Oysters
Answer : A
18. Which of the following statement is not correct for methanogens?
A. They are archaebacteria.
B. They live in marshy areas.
C. Methane is their preferred carbon source.
D. They are present in guts of several ruminant animals (cow, buffaloes) and produce biogas (CH4) from the dung of these animals.
Answer : C
A. They are archaebacteria.
B. They live in marshy areas.
C. Methane is their preferred carbon source.
D. They are present in guts of several ruminant animals (cow, buffaloes) and produce biogas (CH4) from the dung of these animals.
Answer : C
19. Match the class of fungi given in column-I with their common name given in column-II and select the correct option.
A. A II, B I, C IV, D III
B. A II, B IV, C I, D III
C. A IV, B I, C II, D III
D. A IV, B III, C II, D I
Answer : A
| Column-I | Column-II |
|---|---|
| (Class of fungi) | (Common name) |
| A. Phycomycetes | I. Sac fungi |
| B. Ascomycetes | II. Algal fungi |
| C. Basidiomycetes | III. Fungi imperfecti |
| D. Deuteromycetes | IV. Club fungi |
A. A II, B I, C IV, D III
B. A II, B IV, C I, D III
C. A IV, B I, C II, D III
D. A IV, B III, C II, D I
Answer : A
20. Match column I (Kingdom) with column II (Class) and select the correct options
A. A IV, B III, C II, D I
B. A I, B II, C III, D IV
C. A III, B IV, C II, D I
D. A IV, B II, C III, D I
Answer : A
| Column-I | Column-II |
|---|---|
| (Kingdom) | (Class) |
| A. Plantae | I. Archaebacteria |
| B. Fungi | II. Euglenoids |
| C. Protista | III. Phycomycetes |
| D. Monera | IV. Algae |
A. A IV, B III, C II, D I
B. A I, B II, C III, D IV
C. A III, B IV, C II, D I
D. A IV, B II, C III, D I
Answer : A
21. Bacteria lack alternation of generation because there is
A. neither syngamy nor reduction division.
B. no distinct chromosomes.
C. no conjugation.
D. no exchange of genetic material.
Answer : A
A. neither syngamy nor reduction division.
B. no distinct chromosomes.
C. no conjugation.
D. no exchange of genetic material.
Answer : A
22. T. O. Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
A. Viruses
B. Viroids
C. Virion
D. Mycoplasma
Answer : B
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.
A. Viruses
B. Viroids
C. Virion
D. Mycoplasma
Answer : B
23. Match column-I (Characters/feature) with column-II (examples) and choose the correct option.
A. A III; B II; C I; D IV
B. A II; B III; C I; D IV
C. A II; B III; C IV; D I
D. A II; B IV; C III; D I
Answer : C
| Column-I | Column-II |
|---|---|
| (Characters/features) | (Examples) |
| A. Red dinoflagellates | I. Rhizopus |
| B. Unicellular fungi used to | II. Gonyaulax make bread and beer |
| C. Source of antibiotics | III. Yeast |
| D. Bread mould | IV. Penicillium |
A. A III; B II; C I; D IV
B. A II; B III; C I; D IV
C. A II; B III; C IV; D I
D. A II; B IV; C III; D I
Answer : C
24. Select the correct match from the given option.
A. Occurrence of dikaryotic stage - ascomycetes and basidiomycetes.
B. Saprophytes - They are autotrophic and absorb soluble organic matter from dead substrates.
C. Vegetative mean of reproduction in fungi - fragmentation, budding and sporangiophores.
D. Steps involved in asexual cycle of fungi - plasmogamy, karyogamy and meiosis in zygote resulting in haploid spores.
Answer : A
A. Occurrence of dikaryotic stage - ascomycetes and basidiomycetes.
B. Saprophytes - They are autotrophic and absorb soluble organic matter from dead substrates.
C. Vegetative mean of reproduction in fungi - fragmentation, budding and sporangiophores.
D. Steps involved in asexual cycle of fungi - plasmogamy, karyogamy and meiosis in zygote resulting in haploid spores.
Answer : A
25. Which of the following is a parasitic fungi on the mustard plant ?
A. Albugo
B. Puccinia
C. Yeast
D. Ustilago
Answer : A
A. Albugo
B. Puccinia
C. Yeast
D. Ustilago
Answer : A
26. Match column I (containing fungus name) with column II (common name) and choose the correct options.
A. A I, B II, C III, D IV
B. A II, B III, C IV, D I
C. A III, B IV, C I, D II
D. A IV, B III, C II, D I
Answer : D
| Column-I | Column-II |
|---|---|
| (Fungus name) | (Commonly called) |
| A. Puccinia | I. Yeast |
| B. Ustilago | II. Mushroom |
| C. Agaricus | III. Smut fungus |
| D. Saccharomyces | IV. Rust fungus |
A. A I, B II, C III, D IV
B. A II, B III, C IV, D I
C. A III, B IV, C I, D II
D. A IV, B III, C II, D I
Answer : D
27. Which of the following is used extensively in biochemical and genetic work ?
A. Agaricus
B. Alternaria
C. Neurospora
D. Mucor
Answer : C
A. Agaricus
B. Alternaria
C. Neurospora
D. Mucor
Answer : C
28. Fungi show asexual reproduction by all of the following kinds of spores except
A. conidia
B. oospores
C. sporangiospores
D. zoospores
Answer : B
A. conidia
B. oospores
C. sporangiospores
D. zoospores
Answer : B
29. Which of the following pairs comes under the group chrysophytes ?
A. Diatoms and Euglena
B. Euglena and Trypanosoma
C. Diatoms and Desmids
D. Gonyaulax and Desmids
Answer : C
A. Diatoms and Euglena
B. Euglena and Trypanosoma
C. Diatoms and Desmids
D. Gonyaulax and Desmids
Answer : C
30. Which of the following are the characters of dinoflagellates?
(i) They are planktonic golden yellow algae with soap box like structure.
(ii) They are marine red biflagellated protista.
(iii) They appear yellow, green, brown, blue and red in colour.
(iv) They are biflagellated organisms with pellicle.
(v) They are saprophytic (or) parasitic unicellular forms.
A. (ii) and (iii)
B. (ii) and (v)
C. (i), (ii) and (iii)
D. (ii), (iv) and (v)
Answer : C
(i) They are planktonic golden yellow algae with soap box like structure.
(ii) They are marine red biflagellated protista.
(iii) They appear yellow, green, brown, blue and red in colour.
(iv) They are biflagellated organisms with pellicle.
(v) They are saprophytic (or) parasitic unicellular forms.
A. (ii) and (iii)
B. (ii) and (v)
C. (i), (ii) and (iii)
D. (ii), (iv) and (v)
Answer : C
31. Choose the correct names of the different bacteria given below according to their shapes.
A. A – Cocci, B – Bacilli, C – Spirilla, D – Vibrio
B. A – Bacilli, B – Cocci, C – Spirilla, D – Vibrio
C. A – Spirilla, B – Bacilli, C – Cocci, D – Vibrio
D. A – Spirilla, B – Vibrio, C – Cocci, D – Bacilli
Answer : A
A. A – Cocci, B – Bacilli, C – Spirilla, D – Vibrio
B. A – Bacilli, B – Cocci, C – Spirilla, D – Vibrio
C. A – Spirilla, B – Bacilli, C – Cocci, D – Vibrio
D. A – Spirilla, B – Vibrio, C – Cocci, D – Bacilli
Answer : A
32. The given statements are some charactes of a particular group of Kingdom protista.
(i) Most of them are fresh water organisms found in standing water.
(ii) They have a protein rich layer (called pellicle) which makes their body flexible.
(iii) They have two flagella, a short and a long one.
(iv) Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms.
Identify the correct group on the basis of these characters.
A. Protozoans
B. Chrysophytes
C. Slime moulds
D. Euglenoids
Answer : D
(i) Most of them are fresh water organisms found in standing water.
(ii) They have a protein rich layer (called pellicle) which makes their body flexible.
(iii) They have two flagella, a short and a long one.
(iv) Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms.
Identify the correct group on the basis of these characters.
A. Protozoans
B. Chrysophytes
C. Slime moulds
D. Euglenoids
Answer : D
33. The subunit of capsid is called
A. core
B. nucleotide
C. amino acid
D. capsomere
Answer : D
A. core
B. nucleotide
C. amino acid
D. capsomere
Answer : D
34. Which of the following pigment is present in cyanobacteria?
A. Chlorophyll a
B. Chlorophyll b
C. Chlorophyll c
D. Chlorophyll d
Answer : A
A. Chlorophyll a
B. Chlorophyll b
C. Chlorophyll c
D. Chlorophyll d
Answer : A
35. Which of the following characteristic(s) is used by Whittaker for the classification of organisms ?
A. Mode of nutrition
B. Thallus organisation
C. Phylogenetic relationships
D. All of the above
Answer : D
A. Mode of nutrition
B. Thallus organisation
C. Phylogenetic relationships
D. All of the above
Answer : D
36. Bacteria were regarded to be plants because
A. some of them are green in colour.
B. they are present every where.
C. some of them cannot move.
D. they have a rigid cell wall.
Answer : D
A. some of them are green in colour.
B. they are present every where.
C. some of them cannot move.
D. they have a rigid cell wall.
Answer : D
37. Which one of the following statement is correct for archaea?
A. Archaea resemble eukaryotes in all respects.
B. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.
C. Archaea completely differ from both prokaryotes and eukaryotes.
D. Archaea completely differ from prokaryotes.
Answer : B
A. Archaea resemble eukaryotes in all respects.
B. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.
C. Archaea completely differ from both prokaryotes and eukaryotes.
D. Archaea completely differ from prokaryotes.
Answer : B
38. Lichens indicate SO2 pollution because they
A. show association between algae and fungi.
B. grow faster than others.
C. are sensitive to SO2.
D. flourish in SO2 rich environment.
Answer : C
A. show association between algae and fungi.
B. grow faster than others.
C. are sensitive to SO2.
D. flourish in SO2 rich environment.
Answer : C
39. Assume that two normal hyphal cells of different fungal mating types unite. After a period of time, the cell between these cells will dissolve producing a
A. mycelium
B. fruiting body
C. zygote
D. dikaryotic cell, which is also heterokaryotic
Answer : D
A. mycelium
B. fruiting body
C. zygote
D. dikaryotic cell, which is also heterokaryotic
Answer : D
40. Which of the following statement(s) is/are correct about ascomycetes ?
(i) Neurospora, which is used in biochemical and genetic work is a member of this class.
(ii) They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
(iii) They are saprophytic, decomposers, parasitic or coprophilous.
(iv) Some examples are Aspergillus, Claviceps and Neurospora.
A. Both (i) and (ii)
B. Only (ii)
C. (i), (iii) and (iv)
D. All of these
Answer : C
(i) Neurospora, which is used in biochemical and genetic work is a member of this class.
(ii) They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
(iii) They are saprophytic, decomposers, parasitic or coprophilous.
(iv) Some examples are Aspergillus, Claviceps and Neurospora.
A. Both (i) and (ii)
B. Only (ii)
C. (i), (iii) and (iv)
D. All of these
Answer : C
41. Which one of the following is a characteristic feature of chrysophytes?
A. They are parasitic forms which cause diseases in animals.
B. They have a protein rich layer called pellicle.
C. They have indestructible wall layer deposited with silica.
D. They are commonly called dinoflagellates.
Answer : C
A. They are parasitic forms which cause diseases in animals.
B. They have a protein rich layer called pellicle.
C. They have indestructible wall layer deposited with silica.
D. They are commonly called dinoflagellates.
Answer : C
42. Protozons are not included in kingdom animalia because they are
A. mostly asymmetrical.
B. unicellular eukaryotes.
C. heterotrophic in nature.
D. multicellular prokaryotes.
Answer : B
A. mostly asymmetrical.
B. unicellular eukaryotes.
C. heterotrophic in nature.
D. multicellular prokaryotes.
Answer : B
43. Choose the correct statements (i v) regarding mycoplasma
(i) Mycoplasma has no cell wall.
(ii) Mycoplasma is the smallest living organism.
(iii) Mycoplasma cannot survive without O2.
(iv) Mycoplasma are pathogenic in animals and plants.
(v) A sort of sexual reproduction occurs in bacterium by adopting a primitive DNA transfer from one bacterium to the other.
A. Only (iii)
B. (i), (iii) and (v)
C. (i), (ii), (iv), and (v)
D. All of the above
Answer : C
(i) Mycoplasma has no cell wall.
(ii) Mycoplasma is the smallest living organism.
(iii) Mycoplasma cannot survive without O2.
(iv) Mycoplasma are pathogenic in animals and plants.
(v) A sort of sexual reproduction occurs in bacterium by adopting a primitive DNA transfer from one bacterium to the other.
A. Only (iii)
B. (i), (iii) and (v)
C. (i), (ii), (iv), and (v)
D. All of the above
Answer : C
44. The given figure shows some labelled structure as A, B, C and D. In which structure the protein coat that encloses the nucleic acid is present?
A. A
B. B
C. C sheath
D. D tail fibres
Answer : A
A. A
B. B
C. C sheath
D. D tail fibres
Answer : A
45. Which of the following statement(s) is/are correct ?
(i) Reproduction in fungi can take place by vegetative means fragmentation, fission and budding.
(ii) Fusion of two nuclei is called plasmogamy.
(iii) Fusion of protoplasms between two motile or nonmotile gametes is called karyogamy.
(iv) Meiosis in zygote results in diploid spores.
A. Only (i)
B. Both (ii) and (iii)
C. (ii), (iii) and (iv)
D. All of these
Answer : A
(i) Reproduction in fungi can take place by vegetative means fragmentation, fission and budding.
(ii) Fusion of two nuclei is called plasmogamy.
(iii) Fusion of protoplasms between two motile or nonmotile gametes is called karyogamy.
(iv) Meiosis in zygote results in diploid spores.
A. Only (i)
B. Both (ii) and (iii)
C. (ii), (iii) and (iv)
D. All of these
Answer : A
46. Which of the following group of kingdom protista is being described by the statements given below ?
(i) This group includes diatoms and golden algae.
(ii) They are microscopic and float passively in water currents (plankton).
(iii) Most of them are photosynthetic.
(iv) They have deposits in their habitat; this accumulation over billion of years is referred to as diatomaceous earth.
A. Dinoflagellates
B. Chrysophytes
C. Euglenoids
D. Slime moulds
Answer : B
(i) This group includes diatoms and golden algae.
(ii) They are microscopic and float passively in water currents (plankton).
(iii) Most of them are photosynthetic.
(iv) They have deposits in their habitat; this accumulation over billion of years is referred to as diatomaceous earth.
A. Dinoflagellates
B. Chrysophytes
C. Euglenoids
D. Slime moulds
Answer : B
47. Which class of fungi lacks sex organs but the process of plasmogamy is brought about by fusion of two vegetative or somatic cells of different strains or genotypes?
A. Sac fungi
B. Bracket fungi
C. Imperfect fungi
D. Phycomycetes
Answer : B
A. Sac fungi
B. Bracket fungi
C. Imperfect fungi
D. Phycomycetes
Answer : B
48. Bladderwort and Venus fly trap are examples of
A. insectivorous plants
B. parasitic plants
C. N2 rich plants
D. aquatic plants
Answer : A
A. insectivorous plants
B. parasitic plants
C. N2 rich plants
D. aquatic plants
Answer : A
49. The most abundant prokaryotes helpful to humans in making curd from milk and in productionof antibiotics are the ones categorised as
A. cyanobacteria
B. archaebacteria
C. chemosynthetic autotrophs
D. heterotrophic bacteria
Answer : D
A. cyanobacteria
B. archaebacteria
C. chemosynthetic autotrophs
D. heterotrophic bacteria
Answer : D
50. The given characters are seen in which of the following group?
(i) Unicellular, colonial, filamentous, marine or terrestrial forms.
(ii) The colonies are surrounded by a gelatinous sheath.
(iii) Some can fix atmospheric nitrogen in specialized cells called heterocysts.
(iv) They often form blooms in water bodies.
A. Archaebacteria
B. Cyanobacteria
C. Chrysophytes
D. Dinoflagellates
Answer : B
(i) Unicellular, colonial, filamentous, marine or terrestrial forms.
(ii) The colonies are surrounded by a gelatinous sheath.
(iii) Some can fix atmospheric nitrogen in specialized cells called heterocysts.
(iv) They often form blooms in water bodies.
A. Archaebacteria
B. Cyanobacteria
C. Chrysophytes
D. Dinoflagellates
Answer : B
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