NEET Biology Biological Classification MCQs Set E

Question: The bacterium (Clostridium botulinum) that causes botulism is

• a) An obligate anaerobe
• b) An obligate aerobe
• c) A facultative anaerobe
• d) A facultative aerobe

Answer: An obligate anaerobe

Question: Barophilic prokaryotes

• a) Grow and multiply in very deep marine sediments
• b) Occur in water containing high concentrations of barium hydroxide
• c) Grow slowly in highly alkaline frozen lakes at high altitudes
• d) Readily grown and divides in sea water enriched in any soluble salt of barium

Answer: Grow and multiply in very deep marine sediments

Question: Auxospores and hormocysts are formed, respectively, by

• a) Several diatoms and a few cyanobacteria
• b) Some diatoms and several cyanobacteria
• c) Several cyanobacteria and several diatoms
• d) Some cyanobacteria and many diatoms

Answer: Several diatoms and a few cyanobacteria

Question: All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia

• a) Can fix nitrogen in the free-living state
• b) Can induce root nodules on many plant species
• c) Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex
• d) Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

Answer: Can fix nitrogen in the free-living state

Question: Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used :

• a) Only on plates with streptomycin
• b) Only on plates without streptomycin
• c) On plates with minimal medium
• d) On plates with and without streptomycin

Answer:  Only on plates with streptomycin

Question: Which of the following unicellular organism has a macronucleus for trophic function and one or more micronuclei for reproduction?

• a) Paramecium
• b) Trypanosoma
• c) Amoeba
• d) Euglena

Answer: Paramecium

Question: Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread ?

A. Temperature of about 25°C
B. Temperature of about 5°C
C. Relative humidity of about 5%
D. Relative humidity of about 95%
E. A shady place
F. A brightly illuminated place
Choose the answer from the following options :

• a) A, D and E only
• b) B, D and E only
• c) B, C and F only
• d) A, C and E only

Answer: A, D and E only

Question: Curing of tea leaves is brought about by the activity of:

• a) Bacteria
• b) Mycorrhiza
• c) Viruses
• d) Fungi

Answer:  Bacteria

Question: For retting of jute the fermenting microbe used is:

• a) Butyric acid bacteria
• b) Methophilic bacteria
• c) Helicobactor pylori
• d) Streptococcus lactin

Answer: Butyric acid bacteria

 More Questions..................................................

Question: What is common about Trypanosoma, Noctiluca, Monocystis and Giardia ?

• a) These are all unicellular protists
• b) They produce spores
• c) They have flagella
• d) These are all parasites

Answer: These are all unicellular protists

Question: T.O. Diener discovered a

• a) Free infectious RNA
• b) Infectious protein
• c) Free infectious DNA
• d) Bacteriophage

Answer: Free infectious RNA

Question: In the five kingdom system of classification, which single kingdom out of the following can include blue-green algae, nitrogen fixing bacteria and methanogenic archaebacteria?

• a) Monera
• b) Fungi
• c) Protista
• d) Plantae

Answer: Monera

Question: In five kingdom system, the main basis of classification is

• a) Mode of nutrition
• b) Asexual reproduction
• c) Structure of nucleus
• d) Structure of cell wall

Answer: Mode of nutrition

Question: Maximum nutritional diversity is found in the group

• a) Monera
• b) Plantae
• c) Fungi
• d) Animalia

Answer: Monera

Question: Specialized cells for fixing atmospheric nitrogen in Nostoc are

• a) Heterocysts
• b) Akinetes
• c) Hormogonia
• d) Nodules

Answer: Heterocysts

Question: Nuclear membrane is absent in

• a) Nostoc
• b) Volvox
• c) Penicillium
• d) Agaricus

Answer: Nostoc

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

• a) Heterotrophic bacteria
• b) Archaebacteria
• c) Chemosynthetic autotrophs
• d) Cyanobacteria

Answer: Heterotrophic bacteria

Question: Organisms called Methanogens are most abundant in a

• a) Cattle yard
• b) Polluted stream
• c) Sulphur rock
• d) Hot spring

Answer: Cattle yard

Question: Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?

• a) Marsh gas
• b) Laughing gas
• c) Propane
• d) Mustard gas

Answer: Marsh gas

Question: A peculiar odour that prevails in marshy areas and cow-sheds is on account of a gas produced by

• a) Archaebacteria
• b) Slime moulds
• c) Cyanobacteria
• d) Mycoplasma

Answer: Archaebacteria

Question: Organisms, which fix atmospheric nitrogen in the soil, fall under the category of

• a) Bacteria
• b) Green algae
• c) Soil fungi
• d) Mosses

Answer: Bacteria

Question: Many blue-green algae occur in thermal springs (hot water springs). The temperature tolerance of these algae have been attributed to their

• a) Importance of homopolar bonds in their proteins
• b) Modern cell organization
• c) Cell wall structure
• d) Mitochondrial structure

Answer: Importance of homopolar bonds in their proteins

Question: For the first time, the bacteria were observed by

• a) A.V. Leeuwenhoek
• b) W.H. Stanley
• c) Louis Pasteur
• d) Robert Koch

Answer: A.V. Leeuwenhoek

Question: A large number of organic compounds can be decomposed by

• a) Pseudomonas
• b) Photolithotrophs
• c) Chemoheterotrophs
• d) Photoheterotorphs

Answer: Pseudomonas

Question: Transduction in bacteria is mediated by

• a) Phage vector
• b) Cosmid
• c) F-factor
• d) Plasmid vector

Answer: Phage vector

Question: What are the sex organs provided in some bacteria?

• a) Sex pili
• b) Plasmid
• c) Circular DNA
• d) Gametes

Answer: Sex pili

Question: BGA (blue green algae) are included in which of the following groups?

• a) Prokaryotes
• b) Protista
• c) Fungi
• d) Bryophytes

Answer: Prokaryotes

Question: Which type of DNA is found in bacteria?

• a) Circular DNA
• b) Straight DNA
• c) Membrane bound DNA
• d) Helical DNA

Answer: Circular DNA

Question: The DNA of E.coli is

• a) Double stranded and circular
• b) Single stranded and circular
• c) Double stranded and linear
• d) Single stranded and linear

Answer: Double stranded and circular

Question: Photosynthetic bacteria have pigments in

• a) Chromatophores
• b) Chromoplasts
• c) Leucoplasts
• d) Chloroplasts

Answer: Chromatophores

Question: What is true for Archaebacteria?

• a) Oldest living beings
• b) All are fossils
• c) All are photosynthetic
• d) All are halophiles

Answer: Oldest living beings

Question: What is true for cyanobacteria?

• a) Oxygenic with nitrogenase
• b) Non oxygenic with nitrogenase
• c) Oxygenic without nitrogenase
• d) Non oxygenic without nitrogenase

Answer: Oxygenic with nitrogenase

Question: Organisms which obtain energy by the oxidation of reduced inorganic compounds are called

• a) Chemoautotrophs
• b) Saprozoic
• c) Heterotrophs
• d) Photoautotrophs

Answer: Chemoautotrophs

Question: Which statement is correct for bacterial transduction?

• a) Transfer of some genes from one bacteria to another bacteria through virus
• b) Transfer of genes from one bacteria to another bacteria by establishing contact
• c) Bacteria obtained its DNA directly from mother cell
• d) Bacteria obtained DNA from other external source

Answer: Transfer of some genes from one bacteria to another bacteria through virus

Question: Chromosomes in a bacterial cell can be 1 in number and

• a)

  

• b)

  

• c) Can be either circular or linear, but never both within the same cell
• d) Can be circular as well as linear within the same cell

Answer: 

Question: Viruses that infect bacteria and cause their lysis, are called

• a) Lytic
• b) Lysogenic
• c) Lipolytic
• d) Lysozymes

Answer: Lytic

Question: The most thoroughly studied bacteria plant interactions is the

• a) Gall formation on certain angiosperms by Agrobacterium
• b) Cyanobacterial symbiosis with some aquatic ferns
• c) Nodulation of Sesbania stems by nitrogen fixing bacteria
• d) Plant growth stimulation by phosphate-solubilising bacteria

Answer: Gall formation on certain angiosperms by Agrobacterium

Question: What is true for photolithotrops?

• a) Obtain energy from radiations and hydrogen from inorganic compounds
• b) None of these
• c) Obtain energy from radiations and hydrogen from organic compounds
• d) Obtain energy from organic compounds

Answer: Obtain energy from radiations and hydrogen from inorganic compounds

Question: The protists have

• a) Membrane bound nucleoproteins lying embedded in the cytoplasm
• b) Only free nucleic acid aggregates
• c) Gene containing nucleoproteins condensed together in loose mass
• d) Nucleoprotein in direct contact with the rest of the cell substance

Answer: Membrane bound nucleoproteins lying embedded in the cytoplasm

Question: Which of the following organism possesses characteristics of a plant and an animal?

• a) Euglena
• b) Paramecium
• c) Bacteria
• d) Mycoplasma

Answer: Euglena

Question: VAM is an example of

• a) Endomycorrhiza
• b) Ectoparasitism
• c) Endoparasitism
• d) Ectomycorrhiza

Answer: Endomycorrhiza

Question: An example of endomycorrhiza is

• a) Glomus
• b) Agaricus
• c) Rhizobium
• d) Nostoc

Answer: Glomus

Question: Satellite RNAs are present in some

• a) Plant viruses
• b) Viroids
• c) Prions
• d) Bacteriophages

Answer: Plant viruses

Question: A cell-coded protein that is formed in response to infection with most animal viruses, is called

• a) Interferon
• b) Antigen
• c) Antibody
• d) Histone

Answer: Interferon

Question: obacco mosaic virus (TMV) genes are associated with

• a)  Single stranded RNA
• b) Single stranded DNA
• c) Double stranded DNA
• d) Double stranded RNA

Answer: Single stranded RNA

Question: The tailed bacteriophages are

• a) Non-motile
• b) Actively motile in water
• c) Motile on surface of plant leaves
• d) Motile on surface of bacteria

Answer: Non-motile

Question: Viruses posses

• a) Either DNA or RNA
• b) Ribosomes to synthesize protein
• c) Organelles for its vital mechanisms
• d) None of these

Answer: Either DNA or RNA

Question: Enzymes are generally not found in

• a) Virus
• b) Cyanobacteria
• c) Algae
• d) Fungi

Answer: Virus

Question: Viruses are living, because they

• a) Multiply in host cells
• b) Carry anaerobic respiration
• c) Carry metabolic activities
• d) Cause infection

Answer: Multiply in host cells

Question: Viruses are no more “alive” than isolated chromosomes because

• a) Both require the environment of a cell to replicate
• b) They both require oxygen for respiration
• c) They both need food molecules
• d) They require both RNA and DNA

Answer: Both require the environment of a cell to replicate

Question: Tobacco mosaic virus is elongated rod like with size

• a) 300 × 18 nm
• b) 700 × 30 nm
• c) 300 × 5 nm
• d) 300 × 10 nm

Answer: 300 × 18 nm

Question: Which one of the following statements about viruses is correct ?

• a) Viruses are obligate parasites
• b) Viruses possess their own metabolic system
• c) All viruses contain both RNA and DNA
• d) Nucleic acid of viruses is known as capsid

Answer: Viruses are obligate parasites

Question: Which of the following statements is not true for retroviruses?

• a) DNA is not present at any stage in the life cycle of retroviruses
• b) Retroviruses carry gene for RNA-dependent DNA polymerase
• c) The genetic material in mature retroviruses is RNA
• d) Retroviruses are causative agents for certain kinds of cancer in man

Answer: DNA is not present at any stage in the life cycle of retroviruses

Question: The causative agent of mad-cow disease is a

• a) Prion
• b) Worm
• c) Bacterium
• d) Virus

Answer: Prion

Question: Which one of the following statement about lichens is wrong?

• a) These grow very rapidly (2 cm per day)
• b) They show fungal and algal symbiotic relationships
• c) Some of its species are eaten by reindeers
• d) These are pollution indicators

Answer: These grow very rapidly (2 cm per day)

Question: Most of the lichens consist of

• a) Green algae and ascomycetes
• b) Blue green algae and basidiomycetes
• c) Brown algae and higher plant
• d) Red algae and ascomycetes

Answer: Green algae and ascomycetes

Question: Which of the following is the use of lichens in case of pollution?

• a) They act as bioindicators of pollution
• b) Lichens are not related with pollution
• c) They promote pollution
• d) They treat the polluted water

Answer: They act as bioindicators of pollution

Question: Lichens are well known combination of an alga and a fungus where fungus has

• a) A symbiotic relationship with alga
• b) An epiphytic relations1hip with the alga
• c) A saprophytic relationship with the alga
• d) A parasitic relationship with alga

Answer: A symbiotic relationship with alga

Question: There exists a close association between the alga and the fungus within a lichen. The fungus

• a) Provides protection, anchorage and absorption for the algae
• b) Provides food for the alga
• c) Fixes the atmospheric nitrogen for the alga
• d) Releases oxygen for the alga

Answer: Provides protection, anchorage and absorption for the algae

Question: What is the genetic material in Influenza virus?

• a) RNA
• b) Double helical DNA
• c) Single helix DNA
• d) None of these

Answer: RNA

Question: The sexual reproduction is absent in

• a) Nostoc
• b) Ulothrix
• c) Volvox
• d) Spirogyra

Answer: Nostoc