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Which statement is not correct for viruses ?

A. Viruses are obligate parasites.

B. Viruses can multiply only when they are inside the living cells.

C. Viruses cannot pass through bacterial filters.

D. Viruses are made up of protein and DNA or RNA (never both DNA and RNA).

Correct Answer :

C. Viruses cannot pass through bacterial filters.


Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.

Related Questions

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The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

A. cyanobacteria

B. archaebacteria

C. chemosynthetic autotrophs

D. heterotrophic bacteria

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4

Which of the following is not a viral disease ?

A. AIDS and mumps

B. Small pox and herpes

C. Influenza

D. Cholera

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4

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.

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4

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.

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4

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.

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4

Read the following statements and answer the question.
(i) Some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling.
(ii) They reproduce only by asexual spores known as conidia.
(iii) Mycelium is septate and branched.
(iv) Alternaria, Colletotrichum and Trichoderma are examples of this class.
Which of the following class of fungi is being described by the above statements ?

A. Phycomycetes

B. Deuteromycetes

C. Basidiomycetes

D. Ascomycetes

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4

Match column I with column II and choose the correct option.
Column IColumn 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)

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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.

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4

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.

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4

Which of the following statement is incorrect ?

A. TMV has a double-stranded RNA molecule.

B. Most plant viruses are RNA viruses.

C. The bacteriophage has a double-stranded DNA molecule.

D. Most animal viruses are DNA viruses.

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4

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.

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4

Which of the following is a parasitic fungi on the mustard plant ?

A. Albugo

B. Puccinia

C. Yeast

D. Ustilago

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Match the characters given in column I with their examples given in column II.
Column IColumn II
A. Long slender thread(i) Lichen like structures
B. Association of fungi with(ii) Mycorrhiza roots of higher plants
C. Parasitic fungi on mustard(iii) Neurospora
D. Fungi extensively used in(iv) Albugo biochemical and genetic work
E. An association in which(v) Hyphae algal component is called phycobiont

A. A-(v) B-(ii) C-(iv) D-(iii) E-(i)

B. A-(iii) B-(i) C-(iv) D-(ii) E-(v)

C. A-(ii) B-(i) C-(iii) D-(v) E-(iv)

D. A-(iii) B-(ii) C-(iv) D-(i) E-(v)

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4

Why food can be kept for a longer time in cold house than in normal conditions ? Because,

A. insect cannot enter.

B. bacterial multiplication stops.

C. bacterial multiplication is reduced.

D. there is plasmolysis at low temperature.

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4

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.

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4

Match column I (Kingdom) with column II (Class) and select the correct options
Column-IColumn-II
(Kingdom)(Class)
A. PlantaeI. Archaebacteria
B. FungiII. Euglenoids
C. ProtistaIII. Phycomycetes
D. MoneraIV. 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

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Which of the following is smallest living cell and can live without oxygen ?

A. Mycoplasma

B. Mycorrhiza

C. Euglena

D. Trypanosoma

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4

Read the given statements and answer the question.
(i) It includes unicellular as well as multicellular fungi.
(ii) In multicellular forms hyphae are branched and septate.
(iii) Conidiophore produces conidia (spores) exogenously in chain.
(iv) Sexual spores are ascospores produced endogenously in chain.
(v) Fruiting body is called ascocarp.
Identify the correct class of fungi which have all the given characteristics.

A. Phycomycetes

B. Sac fungi

C. Club fungi

D. Fungi imperfecti

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Which of the following pigment is present in cyanobacteria?

A. Chlorophyll a

B. Chlorophyll b

C. Chlorophyll c

D. Chlorophyll d

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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.

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4

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

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4

Read the following statements and answer the question given below
(i) They are saprophytic protists.
(ii) Under suitable conditions, they form an aggregation (called plasmodium) which may grow and spread over several feet.
(iii) During unfavourable conditions, the plasmodium differentiates and forms fruiting bodies bearing spores at their tips.
Which of the following class of protists is being described by the above statements ?

A. Euglenoids

B. Dinoflagellates

C. Slime moulds

D. Protozoans

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4

How many bacteria are produced in four hours if a bacterium divides once in half an hour ?

A. 8

B. 64

C. 16

D. 256

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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)

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4

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

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4

Fungi are filamentous with the exception of X which is unicellular. Identify X.

A. Yeast

B. Algae

C. Bacteria

D. Lichen

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4

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

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4

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

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4

Which of the following statement is/ are correct for bacteria ?

A. They are the members of the kingdom monera.

B. They live in extreme habitats such as hot springs, deserts, snow and deep oceans.

C. They show the most extensive metabolic diversity.

D. All of the above

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Which of the following statement(s) is/are correct about class basidiomycetes ?
(i) They are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known.
(ii) They grow in soil, on logs and tree stumps and in living plant bodies as parasites, e.g., rusts and smuts.
(iii) The mycelium is branched and septate.
(iv) Some common members are Agaricus, Ustilago and Puccinia.

A. Only (i)

B. Both (ii) and (iii)

C. (ii), (iii) and (iv)

D. All of these