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CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 10 - MCQExams.com
CBSE
Class 11 Medical Biology
Biological Classification
Quiz 10
Which one is correct pairing
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Hydra
- Anthozoa
0%
Paramecium
- Arachnida
0%
Plasmodium
- Sporozoa
0%
Amoeba
- Ciliata.
Colourless, unicellular, cell wall bound spherical or rod-shaped microorganisms, lacking organized nucleus are
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Bacteria
0%
Mycoplasma
0%
Cyanobacteria
0%
Viruses
Explanation
Bacteria belongs to prokaryotes, one of the 2 major groups. They are unicellular organisms that lack
internal membrane-bound
organelles. They do not have a true nucleus. Instead, they have the incipient nucleus called as nucleoid. Nucleoid is an irregularly shaped region that contains genetic material DNA. They are colourless. They have cell wall. They are either spherical, rod shaped or spiral in
shape.
Thus, the correct answer is 'Bacteria.'
Protozoan protists are differentiated on the basis of
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Nuclei
0%
Shape
0%
Size
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Locomotory structures
Explanation
Phylum protozoa is classified on the basis of locomotory organelles. It is classified into four groups:-
Mastigophora (Zooflagellata): They possess flagella for locomotion.
Sarcodina (Rhizopoda): They develop pseudopodia which are temporary protoplasmic outgrowths.
Sporozoa: All sporozoans are endoparasites. Locomotory organelles are absent.
Ciliata: They develop a number of cilia during a part or whole of the life cycle.
Bacteria are examples of
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Protistan cells
0%
Eukaryotic cells
0%
Animal cells
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Prokaryotic cells
Explanation
Prokaryotes are unicellular organisms. They have a cell wall. They have no membrane-bound organelles such as mitochondria, Golgi complex. They lack a true nucleus. Instead, they have nucleoid, a genetic material without a nuclear membrane. Examples include Bacteria, cyanophyceae (Blue-Green algae), Nitrogen-fixing organisms etc.
Thus, the correct answer is 'Prokaryotic cells.'
Some hyperthermophilic organisms that grow in highly acidic $$(pH_2)$$ habitats belong to two groups
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Cyanobacteria and diatoms
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Protists and mosses
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Liverworts and yeasts
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Eubacteria and archaea
Explanation
Many thermophiles are archaea, while thermophilic eubacteria are suggested to have been among the earliest bacteria.
Many of these require elemental sulfur for growth. Some are anaerobes, that use the sulfur as an electron acceptor during cellular respiration.
Some are lithotrophs, that oxidize sulfur to sulfuric acid, thus requiring the microorganism to be adapted to very low pH as well. These organisms are inhabitants of hot, sulfur-rich environments such as hot springs and geysers etc. Option D is correct.
Which one among the following is likely to be present in the harsh conditions of the deep sea water?
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Saprophytic fungi
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Archaebacteria
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Eubacteria
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Blue-green algae
Explanation
Archeabacteria are also known as extremophiles because of the ability to survive in extreme environmental conditions. The deep sea environment is characterized by increased pressure, low visibility, low in nutrition etc.
So, the correct answer is Archaebacteria.
Which structures are found in
mycoplasmas
,
spirochaetes
and
rickettsias
?
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DNA
0%
RNA
0%
Ribosomes
0%
All of the above
Explanation
Prokaryotes are unicellular organisms without membrane-bound organelles. They do not contain nuclear envelope. They contain nucleoid, genetic material without nuclear envelope. The genetic material present in them is DNA and RNA without proteins. They also contains ribosomes in the cytoplasm. Examples include bacteria like
Mycoplasma
,
Rickettsias
and
Spirochaetes
.
Thus, the correct answer is 'All the above.'
A peculiar odour found in marshy areas and cow sheds is of gas produced by
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0%
Archaebacteria
0%
Cyanobacteria
0%
Slime Moulds
0%
Mycoplasma
Explanation
Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas and cow sheds. This produces a peculiar odour.
Thus, the correct answer is 'Archaebacteria.'
Milk bacterium is
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Acetobacter
0%
Diplococcus
0%
Lactobacillus
0%
Streptobacillus
Explanation
Lactobacillus
is also called as milk bacterium. It produces enzyme lactase. This lactase converts the protein lactose present in the milk into lactic acid. This results in the cuddling of the milk. Hence, this bacterium is used to produced curd and other milk products by the process of fermentation.
Thus, the correct answer is '
Lactobacillus
.'
Which one is not correctly matched?
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Azotobacter
- Nitrogen fixation
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Streptococcus thermophilus
- Yogurt
0%
Chlorobium
- Photosynthesis
0%
Streptomyces rimosus
- Chloromycetin
Explanation
Nitrogen fixation is a process by which atmospheric nitrogen is converted into ammonium compound and is made available to plants.
Azotobacter
is a free living nitrogen fixing bacteria.
Streptococcus thermophilus
is widely used in the formation of Yogurt. It break down the lactose present in the milk. Hence, it is useful for lactose-intolerant people.
Chlorobium
is a genus of green sulfur bacteria. It is able to produce its own food by the process of photosynthesis.
Streptomyces rimosus
is a gram positive bacteria which produces antibiotics like Chloramphenicol.
Thus, the correct answer is 'Streptomyces rimosus - Chloromycetin.'
Membrane bound organelles are absent in
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Streptococcus
0%
Chlamydomonas
0%
Plasmodium
0%
Saccharomyces
Explanation
Correct answer:
A
Explanation:
•
Prokaryotes
do not have membrane-bound organelles.
•
$$\textit{Streptococcus}$$ is a
single-celled
prokaryotic organism that belongs to the Monera Kingdom.
Hence, $$\textit{Streptococcus}$$ does not have membrane-bound organelles.
Organisms called methanogens are most abundant in
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Polluted stream
0%
Cattle yard
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Sulphur rock
0%
Hot spring
Explanation
Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas. They are most abundant in marshy areas and cattle yard where cow sheds are present. The methange gas produces a peculiar odour in these areas.
Thus, the correct answer is 'Cattle yard.'
Which of the following is not true for
Nostoc
?
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Autotrophic
0%
Filamentous
0%
Macroscopic
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Prokaryotic
Explanation
Nostoc
is a genus of filamentous Blue green algae or Cyanobacteria. They are microscopic in nature. They are unicellular prokaryotic organism. They are autotrophic organism. They are capable of synthesizing their own food by the process of photosynthesis. They have ability to fix atmospheric nitrogen.
Thus, the correct answer is 'Macroscopic.'
Archaebacteria live in harsh habitat like
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Extreme salty area
0%
Hot springs
0%
Marshy areas
0%
All of the above
Which of the following is not a moneran?
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Nitrogen-fixing bacterium
0%
Anabaena
0%
Blue-green alga
0%
Amoeba
Explanation
Monerans are prokaryotic unicellular organisms.
Anabaena,
nitrogen-fixing bacteria and blue-green algae are monerans. Amoeba is a protozoan.
So, the correct answer is option D.
The bacterium that helps in breakdown of cellulose in the rumen of cattle is ______________.
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Clostridium
0%
Lactobacillus
0%
Methanobacterium
0%
Escherichia
Explanation
In the
rumen of cattle
methanogens act on the food ( act on carbon atoms present in it ) eaten by cattles and produce methane gas via normal fermentation process. This gas is released into the atmosphere when they exhale
Match and find the correct combination
I
II
(a)
HIV
(i)
Ghost
(b)
Pilus
(ii)
Prophage
(c)
Virus
(iii)
Retro viridae
(d)
Lysogeny
(iv)
Donor
(v)
Polyhedral virus
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(a)-(i), (b)-(ii), (c)-(iii), d-(iv)
0%
(a)-(v), (b)-(iv), (c)-(iii), (d)-(ii)
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(a)-(v), (b)-(iii), (c)-(ii), (d)-(i)
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(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
Archaebacteria common in marshes and rice fields are
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Methanogens
0%
Halophiles
0%
Thermoacidophiles
0%
All of the above
Explanation
Methanogens belongs to Archaebacteria. The other members of Archaebacteria includes halophiles and thermophiles. These are primitive prokaryotes. Methanogens produce methane gas or biogas. They produce biogas or marshy gas in marshy areas, rice fields and digestive tract of ruminants.
Thus, the correct answer is 'Methanogens.'
In which bacteria, lipopolysaccharide is found as the main surface antigen?
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Gram negative bacteria
0%
Gram positive bacteria
0%
Cyanobacteria
0%
All of the above
Explanation
Lipopolysaccharides (LPS), also known as lipoglycans and endotoxins are large molecules consisting of a lipid
and a polysaccharide composed of O-antigen, outer core and inner core joined by a covalent bond
they are found in the outer membrane of Gram-negative bacteria.
The primitive prokaryotes responsible for the production of biogas from the drug of ruminant animals include
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Eubacteria
0%
Halophiles
0%
Thermoacidophiles
0%
Methanogens
Explanation
Methanogens belongs to Archaebacteria. They are primitive prokaryotes. They produce methane gas or biogas. They produce biogas or marshy gas from the drug of ruminant animals. They are found in marshy areas and digestive tract of ruminants.
Thus, the correct answer is 'Methanogens.'
Sexual stages of pathogens of Blast of Rice and Red Rot of Sugarcane are named repectively :
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Magneporthe grisea and
Colletotrichum falcatum
.
0%
Colletotrichum falcatum and
Pyricularia oryzae
.
0%
Magneporthe grisea
.
0%
Magneporthe grisea
and
Glomerella tucumanensis.
In Albugo, sexual reproduction results in the formation of :
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Zygospore
0%
Teliospore
0%
Oospore
0%
Basidiospore
Explanation
The sexual reproduction in albugo gives rise to Oospore.
So the correct option is C.
Methylobacterium causes conversion of
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Organic matter into methane
0%
Methane into methanol
0%
Methane into protein
0%
Methanol into protein
Explanation
Methylobacterium
is a genus of Rhizobiales. It is an aerobic, facultative methylotrophic, fastidious bacterium. It causes conversion of methanol into single cell protein. It contains quinoprotein methanol dehydrogenase (MDH) enzyme which oxidizes methanol into protein.
Thus, the correct answer is 'Methanol into protein.'
The term protista was coined by
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Haeckel
0%
Linnaeus
0%
Copeland
0%
Whittaker
Explanation
Protista was first observed by John Hogg in 1860. This kingdom was known as Kingdom 'Protoctista' at that time and consist of unicellular plants and animals. In 1866 Ernst Haeckel coined the term 'Protista' for them.
Hence the correct answer is option A.
Azotobacter
and
Beijerinckia
are examples of ___________.
Report Question
0%
Symbiotic nitrogen fixing bacteria
0%
Asymbiotic nitrogen fixing bacteria
0%
Photosynthetic
0%
Disease causing bacteria
Explanation
Azotobacter and Beijerinckia are examples of the symbiotic nitrogen-fixing bacteria. The main principle
of the nitrogen fixation is that the molecular nitrogen in the air is converted into ammonia $$(NH_3)$$
Primary producers of deep sea hydrothermal vent ecosystem are
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0%
Coral reels
0%
Green algae
0%
Chemosynthetic bacteria
0%
Blue-green algae
Explanation
Primary producers of the deep sea hydrothermal vent ecosystem are chemosynthetic bacteria. Sulfide-oxidizing bacteria are chemolithotrophic in nature. They are found in the deep sea hydrothermal vent ecosystem. They provide the primary food for the invertebrates found in the immediate vicinity of the vent ecosystem.
Thus, the correct answer is option C.
What is correct
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Slime MouIds are haploid
0%
Protozoans lack cell wall
0%
Pellicle is absent in
Euglena
0%
Dinoflagellates are immobile
Explanation
Protozoa are animal-like protists.
These unicellular eukaryotes that lack cell walls.
They are heterotrophic and feed on other microorganisms or on organic particles. Example,
Amoeba, Paramoecium
etc
So, the correct answer is "Protozoans lack cell walls'.
In lichens, sexual reproduction is usually performed by
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Algal partner only
0%
Fungal partner only
0%
Both algal and fungal partner only
0%
Either of the two partners
Explanation
Lichens exhibit the symbiotic association between algae and fungi. In this plant, algae is the photosynthetic partner involved in food preparation and the fungal partner increases the surface area for the absorption of water and minerals. Also, the fungal partner is involved in sexual reproduction with the help of reproductive structures called apothecia.
Thus, the correct answer is option B.
Zygospore are produced in
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Mucor
/
Rhizopus
0%
Penicillium
0%
Puccinia
0%
Alternaria
Fertilization does not require water in
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0%
Ulothrix
0%
Albugo
0%
Bryophyta
0%
Pteridophyta
Bentham and Hooker proposed their system of classification in
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Genera Plantarum
0%
Species Plantarum
0%
Historia Plantarum
0%
Historia Naturae
Explanation
Bentham and Hooker proposed their system of classification in the book Genera Plantarum. In this book, they gave the biggest and natural classification of seed plants. Their system of classification was based on the principle of natural affinities and is considered as pre-Darwinian as it does not take evolution into account.
So, the correct option is 'Genera Plantarum'.
Which class has been placed in between dicotyledons and monocotyledons by Bentham and Hooker?
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0%
Leptosprongiatae
0%
Eusporangiatae
0%
Gymnospermae
0%
Hepaticopsida
Explanation
Bentham and Hooker divided Spermatophyta or seed-bearing plants into three classes namely-
Dicotyledonae ( class I )
Gymnospermae ( class II )
Monocotyledonae ( class III ).
It was a example
of
natural
system of classification, In which the organisms are classified on the basis of their natural affinities (i.e. the basic similarities in the morphology).
So, the correct option is 'Gymnospermae'.
Which is not an example of eukaryotic cells?
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0%
Euglena viridis
0%
Paramecium caudatum
0%
Amoeba proteus
0%
Escherichia coli
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(D)}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A), (B) and (C)}$$
$$\bullet$$ The order Protista includes unicellular eukaryotic species such as
$$Amoeba\ proteus$$,
$$Paramecium\ caudatum$$, and $$Euglena\ viridis$$.
$$\textbf{Option (D)}$$
$$\bullet$$
The bacterial bacterium $$Escherichia\ coli$$ belongs to the Monera kingdom.
$$\bullet$$
It lacks a nucleus as well as other membrane-bound cell organelles such as chloroplast and mitochondria.
$$\bullet$$
Ribosomes from prokaryotes, such as Escherichia coli (70S type), differ from ribosomes from eukaryotes.
$$\textbf{Thus the Correct option is (D)}$$
In Bentham and Hooker's system classification, ranales are included under
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0%
Calyciflorae
0%
Inferae
0%
Disciflorae
0%
Thalamiflorae
Explanation
In the Bentham and Hooker classification they were characterized as having "stamens usually many, carpels free, endosperm conspicuous, embryo small". The Ranales were the first cohort of the Thalamiflorae according to this classification.
So, the correct option is ' Thalamiflorae'.
Thread-like fungal structures are known as__________.
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Hyphae
0%
Mycelium
0%
Both A and B
0%
None of the above
Explanation
Except for yeasts, which grow as single cells, most fungi grow as thread-like filaments known as hyphae. Each hypha consists of one or more cells surrounded by a tubular cell wall.
Therefore A is the correct option.
Lichens show symbiotic relationships between
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0%
Fungus and roots of higher plants
0%
Fungus and alga
0%
Two algae
0%
Two fungi
Explanation
A lichen is a composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a symbiotic relationship. The combined life form has properties that are very different from the properties of its component organisms. The fungus benefits from the symbiotic relation because algae or cyanobacteria produce food by photosynthesis. The algae or cyanobacteria benefit by being protected from the environment by the filaments of the fungus, which also gather moisture and nutrients from the environment, and (usually) provide an anchor to it.
Thus, the correct answer is option B.
Zoospore of
Albugo
possesses .......... flagella.
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Two similar and apical
0%
Two similar and median
0%
Four apical
0%
Two dissimilar and lateral
Conidia of
Albugo
are arranged
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0%
Irregularly
0%
Acropetally
0%
Basipetally
0%
Intercalary
Which of the following statement is wrong about lichens?
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Some species are eaten by Reindeers.
0%
Lichens are indicators of pollution.
0%
They grow rapidly about 2 cm per day.
0%
They have symbiotic relationship between alga and fungus.
Common bread mould is
Report Question
0%
Yeast
0%
Rhizopus
0%
Clostridium
0%
Myxovirus
Explanation
Rhizopus stolonifer
is commonly known as black bread mold. It is a member of Zygomycota and considered the most important species in the genus Rhizopus. It is one of the most common fungi in the world and has a global distribution although it is most commonly found in tropical and subtropical regions.
Majority of lichens are made of
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0%
Blue-green algae and basidiomycetes
0%
Blue-green algae and ascomycetes
0%
Red algae and ascomycetes
0%
Brown algae and higher plants
Explanation
Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus, and an alga. Usually the association is between member of Ascomycetes with Cyanobacteria. However, in certain cases the association is established between member of Basidiomycetes and Cyanobacteria or chlorophyceae.
So, the correct answer is "Blue-green algae and ascomycetes'.
Which one is not related to perfect stage of fungus ____________.
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0%
Zygospores
0%
Meiospores
0%
Ascospores
0%
Mitospores
Explanation
Mitospores are asexual spores, for example - conidia in
Penicillium
. That is, they are produced by a single parent and do undergo meiosis.
These are non-motile spores produced exogenously from the tips and sides of hyphae. Hence,
Mitospores is not related to the perfect or sexual reproduction stage of the fungus.
So, the correct answer is "Mitospores'.
Symbiotic association of fungi and algae is
Report Question
0%
Lichen
0%
Mycorrhiza
0%
Mycoplasma
0%
Both A and B
Explanation
A lichen is a long living composite organism that arises from green algae or cyanobacteria living among filaments of a fungus in a mutually beneficial relationship (symbiotic relationship). The algal component of a lichen is known as phycobiont and the fungal component is called mycobiont.
Example,
Usnea
So
,
the correct answer is '
Lichen'
Columella is a structure found in
Report Question
0%
Ascus of
Penicillium
0%
Sporangium of
Rhizopus
0%
Pycnidia of
Puccinia
0%
None of the above
Explanation
Columella is present on the tip of long stalk known as sporangiophore, present in the Rhizopus. It supports the Sporangium which has asexual spores. It helps nutrient exchange between the active protoplasm below and the developing spores inside the upper portion of the sporangial head. Sporangiophores arise among distinctive, root-like rhizoids.
So, the correct answer is option B.
In
Mucor
/
Rhizopus
, isogamy occurs between
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0%
(+) and (-) strains
0%
Same strain
0%
Aplanospores
0%
Zygospores
Plasmogamy is fusion of
Report Question
0%
Two haploid cells including their nuclei
0%
Two haploid cells without nuclei fusion
0%
Sperm and egg
0%
Sperm and two polar nuclei
Explanation
The sexual reproduction of fungi involves three phases, namely plasmogamy, karyogamy and meiosis.
In plasmogamy, there is a fusion of two protoplasts that brings together two compatible nuclei within the same cell. This pair of nuclei is called as a dikaryon (resulting cell becomes bi-nucleate).
Thus, there is fusion of two haploid cells without nuclear fusion.
In case of lower fungi, plasmogamy is almost immediately followed by karyogamy but in higher fungi these two processes may be separated in time. so option B is correct.
Rhizopus
reproduces sexually through
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0%
Sporangiospores
0%
Aplanospores
0%
Chlamydospores
0%
Akinetes
Explanation
Rhizopus is a genus of common saprophytic fungi on plants and specialized parasites on animals. Rhizopus produce by forming asexual and sexual spores. In a sexual reproduction, sporangiopores are produced inside a spherical structure, the sporangium. In sexual reproduction, a dark zygospore is produced at the point where two compatible mycelia fuse.
Thus, the correct answer is option (A), 'Sporangiospores'.
Structure helping lichens in respiration is
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0%
Isidium
0%
Soredium
0%
Cephalodium
0%
Cyphella
Mycelium of
Mucor
/
Rhizopus
is
Report Question
0%
Aspetate and unicellular
0%
Septate and unicellular
0%
Septate and multicellular
0%
Coenocytic
Explanation
The vegetative body in Mucor/Rhizopus is a coenocytic which forms white and cotton growth on the substratum because they lack cross walls or septa.
Hence the correct option is D.
"Torula condition" occurs in :
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0%
Rhizopus
0%
Ulothrix
0%
Spirogyra
0%
Riccia
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