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The smallest bacteria are

A. vibrio

B. cocci

C. spirilla

D. bacilli

Correct Answer :

B. cocci


Related Questions

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Endospore formation takes place in which of the following bacteria ?

A. Coccus

B. Bacillus

C. Spirillum

D. Vibrio

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Bacteria having a tuft of flagelia at one end are called

A. monotrichous

B. peritrichous

C. amphitrichous

D. lophotrichous

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Which one of the following fixes CO2 into carbohydrates ?

A. Rhizobiunt

B. Azotobacter

C. Clostridium

D. Rhodospirilium

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Bactcrial cell-wall is composed of

A. chitin

B. mucopeptidc

C. lignin

D. suberin

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True nucleus is absent in

A. fungi

B. algae

C. lichens

D. bacteria

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Which of the following bacteria can oxidise hydrogen sulphide to sulphur?

A. Rhizobium

B. Nitrosomonas

C. Beggiatoa

D. Nitrobacter

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Sexual reproduction in E. coli is known as

A. sexduction

B. transduction

C. conjugation

D. transformation

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The nuclear material in a bacteria is made up of

A. DNA

B. RNA

C. Chromosome

D. None of these

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Tetanus is caused by

A. Bacillus coli

B. Streptococcus spp.

C. Pasteurella pestis

D. Clostridium tetani

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There is no alternation of generation in �. coli due to absence of

A. nucleus

B. chromosomes

C. reduction division

D. syngamy

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Which of the following statement is correct ?

A. All bacteria are autotrophic

B. All bacteria are heterotrophic

C. All bacteria are photosynthetic

D. Most of the bacteria are heterotrophic but some are autotrophic

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Root nodules are formed by the symbiotic relation between the legume and

A. algae

B. bacteria

C. bryophyta

D. fungi

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Food poisoning is generally caused by

A. Escherichia coli

B. Clostridium botulinum

C. Both (a) and (b)

D. None of these

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An example of chemoautotrophic bacterium is

A. mitochondria

B. mesosomes

C. ribosomes

D. cell membrane

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Which of the following occurs in photo-synthetic bacteria only ?

A. Mesosomes

B. Nucleoid

C. Chromatophores

D. Pili

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Putrefying bacteria act upon

A. fats

B. proteins

C. starch

D. oils

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Citrus canker is a common disease of lemon and oranges. It is caused by

A. Bacillus subtilis

B. Rhizobiunt

C. E. coli

D. None of these

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The pigment similar to chlorophyll found in green sulphur bacteria is

A. bacterioviridim

B. bacteriochlorophy11

C. chlorophyll

D. both (a) and (c)

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Germ theory of disease was proposed by

A. Robert Koch

B. L. Pasteur

C. T. Boveri

D. F.Jacob

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Which of the following is a best source of bacteria ?

A. Water

B. Soil

C. Air

D. Human body

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The Streptococcus lactis is responsible for

A. tanning of leather

B. flavouring of tea leaves

C. curdling of milk

D. none of these

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Bacteria reproduce

A. asexually only

B. sexually only

C. mostly asexually

D. mostly sexually

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Peptidoglycan is present in

A. gram-positive bacteria

B. gram-negative bacteria

C. all bacteria

D. only some bacteria

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A free living bacterium capable of fixing atmospheric nitrogen is

A. Staphylococcus

B. Streptococcus

C. Azotobacter

D. None of these

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Bacteria which directly converts atmospheric nitrogen into nitrogen compounds are called

A. Nitrifying bacteria

B. Nitrogen fixing bacteria

C. Denitrifying bacteria

D. Putrefying bacteria

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Of the following, which is not a bacterial action?

A. Sewage disposal

B. Nitrogen fixation

C. Emulsification of fat

D. None of these

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Bacteria are usually classified as plants because they

A. produce spores

B. have cell walls

C. cannot move

D. produce enzymes

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Bacterial activity is minimum at

A. high temperature

B. moderately high temperature

C. moderate temperate

D. low temperature

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Chlorophyll 'a' occurs in

A. all plants except fungi

B. all green plants except prokaryotes

C. all green plants except bacteria

D. all green plants except cyanobacteria

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Bacteria lacks:

A. cell wall

B. cytoplasm

C. ribosomes

D. endoplamic reticulum