Question 1: Palette 1/123

NEET 2026 MCQ

The main criteria used for Five Kingdom Classification proposed By R.H. Whittaker (1969) included :

A. Cell structure

B. Body organization

C. Presence of flagellum

D. Reproduction

E. Phylogenetic relationships

Choose the correct answer from the options given below :

A

A, B, C, D and E

B

B, C and D only

C

A, B, D and E only

D

A, B and E only

Question 2: Palette 2/123

NEET 2026 MCQ

$ \text { Match List-I with List-II. } $

	List-I		List-II
A.	Fusion of protoplasms between gametes	I.	Meiosis
B.	Fusion of two nuclei	II.	Plasmogamy
C.	Generation of haploid spores	III.	Karyogamy

Choose the correct answer from the options given below :

A

A-I, B-III, C-II

B

A-II, B-III, C-I

C

A-II, B-I, C-III

D

A-III, B-II, C-I

Question 3: Palette 3/123

NEET 2026 MCQ

Mad cow disease is caused by $\_\_\_\_$

A

Mycoplasma $s p$.

B

prions

C

viroids

D

Aspergillus $s p$.

Question 4: Palette 4/123

NEET 2026 MCQ

$ \text { Match List-I with List-II. } $

$ \begin{array}{|c|l|c|l|} \hline & \text { List-I } & & \text { List-II } \\ \hline \text { A. } & \text { Spherical } & \text { I. } & \text { Vibrio } \\ \hline \text { B. } & \text { Rod } & \text { II. } & \text { Cocci } \\ \hline \text { C. } & \text { Comma } & \text { III. } & \text { Spirilla } \\ \hline \text { D. } & \text { Spirillum } & \text { IV. } & \text { Bacilli } \\ \hline \end{array} $

Choose the correct answer from the options given below :

A

A-II, B-IV, C-I, D-III

B

A-I, B-III, C-II, D-IV

C

A-III, B-II, C-I, D-IV

D

A-II, B-I, C-IV, D-III

Question 5: Palette 5/123

NEET 2026 MCQ

Symbiotic association between fungi and algae are called $\_\_\_\_$ .

A

chrysophytes

B

lichens

C

sponges

D

mycorrhiza

Question 6: Palette 6/123

NEET 2026 MCQ

Which of the following is not a prokaryote?

A

Fungi

B

Bacteria

C

Blue green algae

D

Mycoplasma

Question 7: Palette 7/123

NEET 2025 MCQ

Each of the following characteristics represent a Kingdom proposed by Whittaker. Arrange the following in increasing order of complexity of body organization.

A. Multicellular heterotrophs with cell wall made of chitin.

B. Heterotrophs with tissue/organ/organ system level of body organization.

C. Prokaryotes with cell wall made of polysaccharides and amino acids.

D. Eukaryotic autotrophs with tissue/organ level of body organization.

E. Eukaryotes with cellular body organization.

Choose the correct answer from the options given below :

A

$A, C, E, D, B$

B

$C, E, A, B, D$

C

$A, C, E, B, D$

D

$C, E, A, D, B$

Question 8: Palette 8/123

NEET 2024 MCQ

Match List-I with List-II:

	List - I Organisms		List - II Mode of Nutrition
(A)	Euglenoid	(I)	Parasitic
(B)	Dinoflagellate	(II)	Saprophytic
(C)	Slime mould	(III)	Photosynthetic
(D)	Plasmodium	(IV)	Switching between photosynthetic and heterotrophic mode

Choose the correct answer from the options given below:

A

A-III, B-IV, C-II, D-I

B

A-IV, B-II, C-I, D-III

C

A-IV, B-III, C-II, D-I

D

A-IV, B-II, С-III, D-I

Question 9: Palette 9/123

NEET 2024 MCQ

Match List I with List II

	List - I		List - II
A.	Rhizopus	I.	Mushroom
B.	Ustilago	II.	Smut fungus
C.	Puccinia	III.	Bread mould
D.	Agaricis	IV.	Rust fungus

Choose the correct answer from the options given below:

A

A-III, B-II, C-IV, D-I

B

A-I, B-III, C-II, D-IV

C

A-III, B-II, C-I, D-IV

D

A-IV, B-III, C-II, D-I

Question 10: Palette 10/123

NEET 2024 MCQ

Which one of the following is not a criterion for classification of fungi?

A

Morphology of mycelium

B

Mode of nutrition

C

Mode of spore formation

D

Fruiting body

Question 11: Palette 11/123

NEET 2023 MCQ

House fly belongs to _____ family.

A

Cyprinidae

B

Hominidae

C

Calliphoridae

D

Muscidae

Question 12: Palette 12/123

NEET 2023 MCQ

'X' and 'Y' are the components of Binomial nomenclature. This naming system was proposed by 'Z' :

A

X-Generic name, Y-Specific epithet, Z-Carolus Linnaeus

B

X-Specific epithet, Y-Generic name, Z-R.H. Whittaker

C

X-Specific epithet, Y-Generic name, Z-Carolus Linnaeus

D

X-Generic name, Y-Specific epithet, Z-R.H. Whittaker

Question 13: Palette 13/123

NEET 2022 MCQ

Mad cow disease in cattle and Cr Jacob disease in humans are due to infection by ______.

A

Prion

B

Bacterium

C

Virus

D

Viroid

Question 14: Palette 14/123

NEET 2022 MCQ

Given below are two statements:

Statement I : Mycoplasma can pass through less than 1 micron filter size.

Statement II : Mycoplasma are bacteria with cell wall.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 15: Palette 15/123

NEET 2022 MCQ

Which of the following is a correct statement?

A

autotrophic organisms classified under kingdom Monera Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera

B

Bacteria are exclusively heterotrophic organisms

C

Slime moulds are saprophytic organisms classified under Kingdom Monera.

D

Mycoplasma have DNA, ribosome and cell wall.

Question 16: Palette 16/123

NEET 2021 MCQ

Which of the following statements is correct?

A

Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells

B

Fusion of two cells is called Karyogamy

C

Fusion of protoplasm between two motile on non-motile gametes is called plasmogamy

D

Organisms that depend on living plants are called saprophytes

Question 17: Palette 17/123

NEET 2020 MCQ

Which of the following is correct about viroids?

A

They have free RNA without protein coat

B

They have DNA with protein coat

C

They have free DNA without protein coat

D

They have RNA with protein coat

Question 18: Palette 18/123

NEET 2019 MCQ

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus :

A

Mangifera indica

B

Mangifera Indica

C

Mangifera indica Car. Linn.

D

Mangifera indica Linn

Question 19: Palette 19/123

NEET 2019 MCQ

Which of the following statements is incorrect?

A

Infective constituent in viruses is the protein coat

B

Prions consist of abnormally folded proteins

C

Viroids lack a protein coat

D

Viruses are obligate parasites

Question 20: Palette 20/123

NEET 2019 MCQ

Which of the following statement is incorrect?

A

Conidia are produced exogenously and ascospores endogenously.

B

Yeasts have filamentous bodies with long thread-like hyphae.

C

Morels and truffles are edible delicacies.

D

Clauiceps is a source of many alkaloids and LSD.

Question 21: Palette 21/123

NEET 2018 MCQ

Which of the following organisms are known as chief producers in the oceans?

A

Euglenoids

B

Cyanobacteria

C

Dinoflagellates

D

Diatoms

Question 22: Palette 22/123

NEET 2018 MCQ

After karyogamy followed by meiosis, spores are produced exogenously in

A

Saccharomyces.

B

Neurospora

C

Alternaria

D

Agaricus

Question 23: Palette 23/123

NEET 2018 MCQ

Oxygen is not produced during photosynthesis by

A

Cycas

B

Green sulphur bacteria

C

Chara

D

Nostoc

Question 24: Palette 24/123

NEET 2018 MCQ

Which among the following is not a prokaryote?

A

Mycobacterium

B

Saccharomyces

C

Oscillatoria

D

Nostoc

Question 25: Palette 25/123

NEET 2018 MCQ

Ciliates differ from all other protozoans in

A

having a contractile vacuole for removing excess water

B

having two types of nuclei.

C

using flagella for locomotion

D

using pseudopodia for capturing prey

Question 26: Palette 26/123

NEET 2018 MCQ

Select the wrong statement.

A

Mushrooms belong to basidiomycetes.

B

Cell wall is present in members of fungi and plantae.

C

Pseudopodia are locomotory and feeding structures in sporozoans.

D

Mitochondria are the powerhouse of the cell in all kingdoms except monera.

Question 27: Palette 27/123

NEET 2017 MCQ

DNA replication in bacteria occurs

A

within nucleolus

B

prior to fission

C

just before transcription

D

during S phase

Question 28: Palette 28/123

NEET 2017 MCQ

Viroids differ from viruses in having

A

DNA molecules without protein coat

B

RNA molecules with protein coat

C

RNA molecules without protein coat

D

DNA molecules with protein coat

Question 29: Palette 29/123

NEET 2017 MCQ

Which of the following are found in extreme saline conditions?

A

Eubacteria

B

Cyanobacteria

C

Mycobacteria

D

Archaebacteria

Question 30: Palette 30/123

NEET 2017 MCQ

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survise without oxygen?

A

Pseudomonas

B

Mycoplasma

C

Nostoc

D

Bacillus

Question 31: Palette 31/123

NEET 2017 MCQ

Which of the following components provides sticky character to the bacterial cell?

A

Nuclear membrane

B

Plasma membrane

C

Glycocalyx

D

Cell wall

Question 32: Palette 32/123

NEET 2016 MCQ

Which one of the following is wrong for fungi?

A

They are eukaryotic.

B

All fungi possess a purely cellulosic cell wall.

C

They are hetertrophic.

D

They are both unicellular and multicellular.

Question 33: Palette 33/123

NEET 2016 MCQ

Methanogens belong to

A

eubacteria

B

archaebacteria

C

dinoflagellates

D

slime moulds.

Question 34: Palette 34/123

NEET 2016 MCQ

Select the wrong statement.

A

The walls of diatoms are easily destructible.

B

'Diatomaceous earth's is formed by the cell walls of diatoms.

C

Diatoms are cheif producers in the oceans.

D

Diatoms are microscopic and float passively in water.

Question 35: Palette 35/123

NEET 2016 MCQ

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the

A

methanogens

B

eubacteria

C

halophiles

D

thermoacidophiles.

Question 36: Palette 36/123

NEET 2016 MCQ

One of the major components of cell wall of most fungi is

A

cellulose

B

hemicellulose

C

chitin

D

peptidoglycan.

Question 37: Palette 37/123

NEET 2016 MCQ

Which of the following statements is wrong for viroids?

A

They cause infections.

B

Their RNA is of high molecular weight.

C

They lack a protein coat.

D

They are smaller than viruses.

Question 38: Palette 38/123

NEET 2016 MCQ

Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the Kingdom

A

Fungi

B

Animalia

C

Monera

D

Protista.

Question 39: Palette 39/123

NEET 2016 MCQ

Which one of the following statements is wrong?

A

Eubacteria are also called false bacteria.

B

Phycomycetes are also called algal fungi.

C

Cyanobacteria are also called blue-green algae.

D

Golden algae are also called desmids.

Question 40: Palette 40/123

NEET 2015 MCQ

The structures that help some bacteria to attach to rocks and/or host tissues are

A

mesosomes

B

holdfast

C

rhizoids

D

fimbriae.

Question 41: Palette 41/123

NEET 2015 MCQ

Pick up the wrong statement.

A

Some fungi are edible.

B

Nuclear membrane is present in Monera.

C

Cell wall is absent in Animalia.

D

Protists have photosynthetic and heterotrophic modes of nutrition.

Question 42: Palette 42/123

NEET 2015 MCQ

Select the wrong statement.

A

The term 'contagium vivum fluidum' was coined by M. W. Beijerinck.

B

Mosaic disease in tobaco and AIDS in human being are caused by viruses.

C

The viroids were discovered by D.J. Ivanowsky.

D

W.M. Stanley showed that viruses could be crystallised.

Question 43: Palette 43/123

NEET 2015 MCQ

Choose the wrong statement.

A

Morels and truffles are poisonous mushrooms.

B

Yeast is unicellular and useful in fermentation.

C

Penicillium is multicellular and produces antibiotics.

D

Neurospora is used in the study of bio-chemical genetics.

Question 44: Palette 44/123

NEET 2015 MCQ

In which group of organisms the cell walls form two thin overlapping shells which fit together?

A

Dinoflagellates

B

Slime moulds

C

Chrysophytes

D

Euglenoids

Question 45: Palette 45/123

NEET 2015 MCQ

Cell wall is absent in

A

Mycoplasma

B

Nostoc

C

Aspergillus

D

Funaria.

Question 46: Palette 46/123

NEET 2015 MCQ

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

A

Ascomycetes

B

Phycomycetes

C

Basidiomycetes

D

Deuteromycetes

Question 47: Palette 47/123

NEET 2015 MCQ

Which one of the following matches is correct?

A

Mucor	Reproduction by conjugation	Ascomycetes

B

Agaricus	Parasitic fungus	Basidiomycetes

C

Phytophthora	Aseptate mycelium	Basidiomycetes

D

Alternaria	Sexual reoroduction absent	Deuteromycetes

Question 48: Palette 48/123

NEET 2015 MCQ

True nucleus is absent in

A

Vaucheria

B

Volvox

C

Anabaena

D

Mucor.

Question 49: Palette 49/123

NEET 2014 MCQ

Viruses have

A

DNA enclosed in a protein coat

B

prokaryotic nucleus

C

single chromosome

D

both DNA and RNA.

Question 50: Palette 50/123

NEET 2014 MCQ

Which structures perform the function of mitochondria in bacteria?

A

Nucleoid

B

Ribosomes

C

Cell wall

D

Mesosomes

Question 51: Palette 51/123

NEET 2014 MCQ

Five kingdom system of classification suggested by R.H. Whittaker is not based on

A

presence or absence of a well defined nucleus

B

mode of reproduction

C

mode of nutrition

D

complexity of body organisation.

Question 52: Palette 52/123

NEET 2014 MCQ

Which of the following shows coiled RNA strand and capsomeres?

A

Polio virus

B

Tobaco mosaic virus

C

Measles virus

D

Retrovirus

Question 53: Palette 53/123

NEET 2014 MCQ

Anoxygenic photosynthesis is characteristic of

A

Rhodospirillum

B

Spirogyra

C

Chlamydomonas

D

Ulva.

Question 54: Palette 54/123

NEET 2014 MCQ

Archaebacteria differ from eubacteria in

A

cell membrane structure

B

mode of nutrition

C

cell shape

D

mode of reproduction.

Question 55: Palette 55/123

NEET 2014 MCQ

The motile bacteria are able to move by

A

fimbriae

B

flagella

C

cilia

D

pili.

Question 56: Palette 56/123

NEET 2013 MCQ

Which one of the following is true for fungi?

A

They lack a rigid cell wall.

B

They are heterotrophs.

C

They lack nuclear membrane.

D

They are phagotrophs.

Question 57: Palette 57/123

NEET 2013 MCQ

Why is a capsule advantageous to a bacterium?

A

It protects the bacterium from desiccation.

B

It provides means of locomotion

C

It allows bacterium to ''hide'' from host's immune system.

D

It allows the bacterium to attach to the surface.

Question 58: Palette 58/123

NEET 2013 MCQ

Which of the following are likely to be present in deep sea water?

A

Blue-green algae

B

Saprophytic fungi

C

Archaebacteria

D

Eubacteria

Question 59: Palette 59/123

NEET 2013 MCQ

Pigment containing membranous extensions in some cyanobacteria are

A

pneumatophores

B

chromatophores

C

heterocysts

D

basal bodies.

Question 60: Palette 60/123

NEET 2012 MCQ

In the five kingdom classification, Chlamydomonas and Chlorella have been included in

A

protista

B

algae

C

plantae

D

monera.

Question 61: Palette 61/123

NEET 2012 MCQ

Nuclear membrane is absent in

A

Penicillium

B

Agaricus

C

Volvox

D

Nostoc.

Question 62: Palette 62/123

NEET 2012 MCQ

Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?

A

Azotobacter

B

Aspergillus

C

Glomus

D

Trichoderma

Question 63: Palette 63/123

NEET 2012 MCQ

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

A

cyanobacteria

B

archaebacteria

C

chemosynthetic autotrophs

D

heterotrophic bacteria.

Question 64: Palette 64/123

NEET 2012 MCQ

Maximum nutritional diversity is found in the group

A

fungi

B

animalia

C

monera

D

plantae.

Question 65: Palette 65/123

NEET 2012 MCQ

Which statement is wrong for viruses?

A

All are parasites.

B

All of them have helical symmetry

C

They have ability to synthesize nucleic acids and proteins.

D

Antibiotics have no effect on them.

Question 66: Palette 66/123

NEET 2012 MCQ

Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?

A

Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.

B

Lichen is a composite organisms formed from the symbiotic association of an algae and a protozoan.

C

Yeast used in making bread and beer is a fungus.

D

Nostoc and Anabaena are examples of protista.

Question 67: Palette 67/123

NEET 2012 MCQ

The cyanobacteria are also referred to as

A

protists

B

golden algae

C

slime moulds

D

blue green algae.

Question 68: Palette 68/123

NEET 2011 MCQ

The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of

A

Taenia, a tapeworm

B

Wuchereria, a filarial worm

C

Rhizopus, a mould

D

Ascaris, a round worm.

Question 69: Palette 69/123

NEET 2011 MCQ

In eubacteria, a cellular component that resembles eukaryotic cell is

A

plasma membrane

B

nucleus

C

ribosomes

D

cell wall.

Question 70: Palette 70/123

NEET 2011 MCQ

Which one of the following also acts as a catalyst in a bacterial cell?

A

5S rRNA

B

snRNA

C

hnRNA

D

23S rRNA

Question 71: Palette 71/123

NEET 2011 MCQ

Which one of the following is incorrectly matched?

A

Root pressure-guttation

B

Puccinia-smut

C

Root-exarch protoxylem

D

Cassia-imbricate aestivation

Question 72: Palette 72/123

NEET 2011 MCQ

Which one of the following organisms is not an eukaryotic cells?

A

Paramecium caudatum

B

Escherichia coli

C

Euglena viridis

D

Amoeba proteus

Question 73: Palette 73/123

NEET 2010 MCQ

Given below is the diagram of a bacteriophage. In which one of the options all the four parts A, B, C and D are correct?

A

A $ \to $ Collar, B $ \to $ Tail fibres, C $ \to $ Head, D $ \to $ Sheath

B

A $ \to $ Tail fibres, B $ \to $ Head, C $ \to $ Sheath, D $ \to $ Collar

C

A $ \to $ Head , B $ \to $ Sheath, C $ \to $ Collar, D $ \to $ Tail fibres

D

A $ \to $ Sheath, B $ \to $ Collar, C $ \to $ Head, D $ \to $ Tail fibres

Question 74: Palette 74/123

NEET 2010 MCQ

Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.
(i)  Methanogens are archaebacteria which produce methane in marshy areas.
(ii)  Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii)  Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(iv)  Mycoplasma lack a cell wall and can survive without oxygen.
The correct statements are

A

(ii) and (iii)

B

(i), (ii) and (iii)

C

(ii), (iii) and (iv)

D

(i), (ii) and (iv).

Question 75: Palette 75/123

NEET 2010 MCQ

Black (stem) rust of wheat is caused by

A

Alternaria solani

B

Ustilago nuda

C

Puccinia graminis

D

Xanthomonas oryzae.

Question 76: Palette 76/123

NEET 2010 MCQ

Virus envelope is known as

A

capsid

B

virion

C

nucleoprotein

D

core.

Question 77: Palette 77/123

NEET 2010 MCQ

Single-celled eukaryotes are included in

A

protista

B

fungi

C

archaea

D

monera.

Question 78: Palette 78/123

NEET 2010 MCQ

Some hyperthermophilic organisms that grow in highly acidic (pH 2) habitats belong to the two groups

A

eubacteria and archaea

B

cyanobacteria and diatoms

C

protists and mosses

D

liverworts and yeasts.

Question 79: Palette 79/123

NEET 2010 MCQ

Membrane-bound organelles are absent in

A

Saccharomyces

B

Streptococcus

C

Chlamydomonas

D

Plasmodium.

Question 80: Palette 80/123

NEET 2010 MCQ

One of the free-living, anaerobic nitrogen-fixer is

A

Beijernickia

B

Rhodospirillum

C

Rhizobium

D

Azotobacter.

Question 81: Palette 81/123

NEET 2009 MCQ

Oxygenic photosynthesis occurs in

A

Oscillatoria

B

Rhodospirillium

C

Chlorobium

D

Chromatium

Question 82: Palette 82/123

NEET 2009 MCQ

Phylogenetic system of classification is based on

A

morphological features

B

chemical constituents

C

floral characters

D

evolutionary relationships.

Question 83: Palette 83/123

NEET 2009 MCQ

T.O. Diener discovered a

A

free infectious DNA

B

infectious protein

C

bacteriophage

D

free infectious RNA.

Question 84: Palette 84/123

NEET 2009 MCQ

Which of the following is a symbiotic nitrogen fixer?

A

Azotobacter

B

Frankia

C

Azolla

D

Glomus

Question 85: Palette 85/123

NEET 2009 MCQ

Which one is the wrong pairing for the disease and its causal organism?

A

Black rust of wheat-Puccinia graminis

B

Loose smut of wheat-Ustilago nuda

C

Root knot of vegetables-Meloidogyne sp.

D

Late blight of potato- Alternaria solani

Question 86: Palette 86/123

NEET 2008 MCQ

Bacterial leaf blight of rice is caused by a species

A

Alternaria

B

Erwinia

C

Xanthomonas

D

Pseudomonas.

Question 87: Palette 87/123

NEET 2008 MCQ

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements in true about archaea?

A

Archaea completely differ from both prokaryyotes and eukaryotes.

B

Archaea completely differ from prokaryotes.

C

Archaea resemble eukarya in all respects.

D

Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Question 88: Palette 88/123

NEET 2008 MCQ

Thermococcus, Methanococcus and Methanobacterium exemplify

A

backteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

B

bacteria that contain a cytoskeleton and ribosomes

C

archaebacteria that contain protein homologous to eukaryotic core histones

D

archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled.

Question 89: Palette 89/123

NEET 2007 MCQ

Which one of the following statements about mycoplasma is wrong?

A

They are pleomorphic?

B

They are sensitive to penicillin.

C

They cause diseases in plants.

D

They are also called PPLO.

Question 90: Palette 90/123

NEET 2007 MCQ

Which one of the following is a slime mould?

A

Physarum

B

Thiobacillus

C

Anabaena

D

Rhizopus

Question 91: Palette 91/123

NEET 2007 MCQ

Which pair of the following belongs to basidiomycetes?

A

Puffballs and Claviceps

B

Peziza and stink horns

C

Morchella and mushrooms

D

Birds nest fungi and puffballs

Question 92: Palette 92/123

NEET 2006 MCQ

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?
A.   Temperature of about 25^o C
B.   Temperature of about 5^o 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

B, C and F only

B

A, C and E only

C

A, D and E only

D

B, D and E only

Question 93: Palette 93/123

NEET 2006 MCQ

Curing of tea leaves is brought about by the activity of

A

fungi

B

bacteria

C

mycorrhiza

D

viruses.

Question 94: Palette 94/123

NEET 2005 MCQ

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

Question 95: Palette 95/123

NEET 2005 MCQ

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

A

can induce root nodules on many plant species

B

can fix nitrogen in the free-living state

C

cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

D

like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex.

Question 96: Palette 96/123

NEET 2005 MCQ

For retting of jute the fermenting microbe used is

A

methanophilic bacteria

B

butyric acid bacteria

C

Helicobactor pylori

D

Streptococcus lactin.

Question 97: Palette 97/123

NEET 2005 MCQ

Basophilic prokaryotes

A

grow and multiply in very deep marine sediments

B

occur in water containing high concentrations of barium hydroxide

C

readily grow and divide in sea water enriched in any soluble salt of barium

D

grow slowly in highly alkaline frozen lakes at high altitudes.

Question 98: Palette 98/123

NEET 2004 MCQ

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

A

a saprophytic relationship with the alga

B

an epiphytic relationship with the alga

C

a parasitic relationship with alga

D

a symbiotic relationship with alga.

Question 99: Palette 99/123

NEET 2004 MCQ

Phenetic classification of organisms is based on

A

observable characteristics of existing organisms

B

the ancestral lineage of existing organisms

C

dendrogram based on DNA characteristics.

D

sexual characteristics.

Question 100: Palette 100/123

NEET 2004 MCQ

A free living nitrogen-fixing cyanobacterium which can also symbiotic association with the water ferm Azolla is

A

Tolypothrix

B

Chlorella

C

Nostoc

D

Anabaena.

Question 101: Palette 101/123

NEET 2004 MCQ

During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and

A

RNA primers are involved

B

is facilitated by telomerase

C

moves in one direction of the site

D

moves in bi-directional way.

Question 102: Palette 102/123

NEET 2004 MCQ

Viruses that infect bacteria multiply and cause their lysis, are called

A

lysozymes

B

lipolytic

C

lytic

D

lysogenic.

Question 103: Palette 103/123

NEET 2004 MCQ

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.

Question 104: Palette 104/123

NEET 2003 MCQ

Which one of the following statements about viruses is correct?

A

Viruses possess their own metabolic system.

B

All viruses contain both RNA and DNA .

C

Viruses are obligate parasites.

D

Nucleic acid of viruses is known as capsid.

Question 105: Palette 105/123

NEET 2003 MCQ

Chromosomes in a bactertial cell can be 1 $-$ 3 in number and

A

are always circular

B

are always linear

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.

Question 106: Palette 106/123

NEET 2003 MCQ

In which kingdom would you classify the archaea and nitrogen-fixing organisms, if the five-kingdom system of classification is used?

A

Plantae

B

Fungi

C

Protista

D

Monera

Question 107: Palette 107/123

NEET 2003 MCQ

Phenetic classification of organisms is based on

A

observable characteristics of rxisting organisms

B

the ancestral lineage of existing organisms

C

denodrogram based on DNA characteristics

D

sexual characteristics.

Question 108: Palette 108/123

NEET 2003 MCQ

Viruses are no more ''alive'' than isolated chromosomes because

A

They require both RNA and DNA

B

they both need food molecules

C

they both require oxygen for respiration

D

both require the environment of a cell to replicate.

Question 109: Palette 109/123

NEET 2003 MCQ

Tobacco mosaic virus is a tubular filament of size

A

300 $ \times $ 10 nm

B

300 $ \times $ 5 nm

C

300 $ \times $ 20 nm

D

700 $ \times $ 30 nm

Question 110: Palette 110/123

NEET 2002 MCQ

Some bacteria are able to grow in streptomycin containing medium due to

A

natural selection

B

induced mutation

C

reproductive isolation

D

genetic drift.

Question 111: Palette 111/123

NEET 2002 MCQ

In bacteria, plasmid is

A

extra chromosomal material

B

main DNA

C

non functional DNA

D

repetitive gene.

Question 112: Palette 112/123

NEET 2002 MCQ

In five kingdom system, the main basis of classification is

A

structure of nucleus

B

mode of nutrition

C

structure of cell wall

D

asexual reproduction.

Question 113: Palette 113/123

NEET 2002 MCQ

The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?

A

Sigmoid

B

Hyperbolic

C

Ascending straight line

D

Descending straight line

Question 114: Palette 114/123

NEET 2002 MCQ

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 conjugation.

C

Bacteria obtained its DNA directly from mother cell.

D

Bacteria obtained DNA from other external source.

Question 115: Palette 115/123

NEET 2002 MCQ

Choose the correct sequence of stages of growth curve for bacteria.

A

Lag, log, stationary, decline phase

B

Lag, log, decline, stationary phase

C

Stationary, lag, log, decline phase

D

Decline, lag, log phase, stationary

Question 116: Palette 116/123

NEET 2002 MCQ

Which of the following secretes toxins during storage conditions of crop plants?

A

Aspergillus

B

Penicillium

C

Fusarium

D

Colletotrichum

Question 117: Palette 117/123

NEET 2002 MCQ

Which fungal disease spreads by seed and flowers?

A

Loose smut of wheat

B

Corn smut

C

Covered smut of barley

D

Soft rot of potato

Question 118: Palette 118/123

NEET 2001 MCQ

Adhesive pad of fungi penetrate the host with the help of

A

mechanical pressure and enzymes

B

hooks and suckers

C

softening by enzymes

D

only by mechanical pressure.

Question 119: Palette 119/123

NEET 2001 MCQ

Cauliflower mosaic virus conrains

A

ss RNA

B

ds RNA

C

ds DNA

D

ss DNA

Question 120: Palette 120/123

NEET 2001 MCQ

What is true for archaebacteria?

A

All halophiles

B

All photosynthetics

C

All fossils

D

Oldest living beings

Question 121: Palette 121/123

NEET 2001 MCQ

Difference in gram positive and gram negative bacteria is due to

A

cell wall

B

cell membrane

C

ribosome

D

cytoplasm.

Question 122: Palette 122/123

NEET 2001 MCQ

What is true for cyanobacteria ?

A

Oxygenic with nitrogenase

B

Oxygenic without nitrogenase

C

Non oxygenic with nitrogenase

D

Non oxygenic without nitrogenase

Question 123: Palette 123/123

NEET 2000 MCQ

Black rust of wheat is caused by

A

Puccinia

B

Ustilago

C

Albugo

D

Phytophthora.