MCQ Questions for Class 11 Medical Biology Biological Classification Quiz 15

A few organisms are known to grow And multiply at a temperature of

$100 - {105^ \circ }C$ they belong to

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Thermophilic sulphur bacteria
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hot spring blue green agae
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methanogenic archaebacteria
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Marine archaebacteria

Explanation

Thermophilic sulphur bacteria can survive at high temperatures between 41 and 122

$^o$ C and an optimum growth temperature which is higher than 75

$^o$ C. Hot spring blue-green algae have an optimum growth temperature of 45

$^o$ C. Methanogenic archaebacterium grows at an optimum temperature of 35-40

$^o$ C. Some marine archaebacteria are extreme thermophiles and grow at temperatures of 65- 80

$^o$ C.

So, the correct answer is 'Thermophilic sulpher bacteria'.

Methanogens and Thermococcus bacteria are similar in the presence of

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Red pigment in cell membrane
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Cyclosis
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Cell wall being cellulosic
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Presence of introns

Sexual life cycle of toadstools is different from Albugo in the presence of

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Flagellated gametes
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Diplophase
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(n+n) phase
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Meiosis

Circular DNA molecule occurs in?

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Viruses
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Bacteria, Chloroplasts and mitochondria
0%
Bacteria and chloroplasts only
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Bacteria only

Most of the lichens consists of?

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Brown algae & higher plants
0%
Read algae & ascomycetes
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Blue green algae & Ascomycetes
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Blue green algae & basidiomycetes

Lichen and mosses do not grow in :-

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$CO_2$ polluted area
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$NO_2$ polluted area
0%
$CO$ polluted area
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$SO_2$ polluted area

Explanation

Solution: Lichens are used as the indicators of air pollution. Air pollutants which are in the gaseous forms get dissolved in the rainwater, especially

$SO_2$ (sulphur dioxide) can damage lichens and check them from growing. Places where lichens are not going, it indicates the air heavily polluted with sulphur dioxide.

So the correct answer is "$$SO_2$$ polluted area"

Lichens are mutualistic relationship between:

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Fungus and photosynthetic algae
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Fungus and cyanobacteria
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Fungus and roots of higher plants
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Both (A) and (B)

Which of the following represents obligate anaerobes?

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Spirogyra
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Pisum sativum
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Onion
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Methane bacteria

Spermatization type of sexual reproduction found in-

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Ustilago
0%
Trichoderma
0%
Nurospora
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Yeast

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

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Mitochondrial structure
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Importance of homopolar bonds in their proteins
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Cell wall structure
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Modern cell organisation

The bacteria which lacks flagella and moves by gliding are included in?

0%
Spirochetes
0%
Rickettsia
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Myxobacteria
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Eubacteria

Which of the following is not true for glycocalyx covering of the bacterial cell?

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It has inner S-layer and outer mucilage
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S-layer is mostly made of polypeptides rich in acidic amino acids
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It protects the cell from desiccation as well as from phagocytes
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It is essential for the survival of bacteria

The lower thalloid plants like algae and fungi exhibit :

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Pre-gametic meiosis
0%
Post-zygotic meiosis
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Pre-zygotic meiosis
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Post-gametic meiosis

A lichen having much branched system of cylindrical or ribbon-like branches but a small thallus, is called as?

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Foliose lichen
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Fruticose lichen
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Crustaceous lichen
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Thallose lichen

Which is incorrect about E.coil?

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It is diploid
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It is found in human intestine
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Transformation, Transduction, Conjugation can show
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Can be used in Recombinant DNA technology

The genetic material of

$\phi \times 174$ is

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ssDNA
0%
ssRNA
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dsDNA
0%
dsRNA

Which one of the following pairs was excluded from Whittaker's five kingdom classification ?

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Virus and lichens
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Algae and euglena
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Lichens and algae
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Euglena and viruses

BNHS is abbreviation of _____________

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Banaras Natural history Society
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Bombay Natural History Society
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Botanical North Himalayan Survey
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Biological Natural History Society

Which one of the following statements regarding viruses is not true ?

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Viruses need living cells to reproduce.
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All viruses are parasites.
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Viruses can synthesize their food through photosynthesis.
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Viruses are similar to chemical substances outside the host.

Whittaker proposed five kingdom classification.

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True
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False

Explanation

$\textbf{Correct answer:}$ The given statement is true.

$\textbf{Explanation:}$

$\bullet$ Robert Whittaker proposed a five kingdom classification in 1969.

$\bullet$ He classified known organisms into the following five kingdoms - Monera, Protista, Fungi, Plantae, and Animalia.

Hair-like cilia or whip-like flagella for locomotion and feeding are present in Kingdom:

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Monera
0%
Protista
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Fungi
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Plantae

Factors responsible for the rapid spread of bread mould on slices of bread are:
(i) large number of spores
(ii) availability of moisture and nutrients in bread
(iii) presence of tubular branched hypae
(iv) formation of round shaped sporangia

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(i) and (iii)
0%
(ii) and (iv)
0%
(i) and (ii)
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(iii) and (iv)

Contagium vivum fluidum was proposed by-

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D.J. Ivanowsky
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M.W. Beijerinek
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Stanley
0%
Robert Hook

Explanation

$\textbf{Correct option:(B)}$

$\textbf{Explanation for correct option:}$

$\bullet$ M.W. Beijerinek (1898) demonstrated that the extract of infected plant of tobacco could cause infection in healthy plants and called the fluid "Contagium vivum fluidum".

$\bullet$ "Contagium vivum fluidum" (Latin: "contagious living fluid") was a phrase first used to describe a virus.

$\bullet$ Hence, the correct answer is (B)

Mode of nutrition in yeast, mushroom and bread-mould is saprophytic.

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True
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False

Which of the following reproduces by spores?

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Fungi
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Virus
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Amoeba
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Hydra

State whether the given statement is true or false:
There is a controversy about viruses whether they are truly alive or not.

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True
0%
False

Identify the fake moss.

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Polytrichum
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Sphagnum
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Cladonia
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Funaria

Choose the correct options with respect to sexual reproduction in fungi.
Statement 1 - Dikaryotic stage occurs during sexual reproduction in Phycomycetes and Basidiomycetes.
Statement 2 - It is an intermediate stage between plasmogamy and karyogamy.

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Both statements are correct.
0%
Both statements are incorrect.
0%
Statement 1 is correct but statement 2 is incorrect.
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Statement 1 is incorrect but statement 2 is correct.

Study the following characteristics about bacteria and select the correct answer.
1) Bacterial structure is very simple because they are unicellular and prokaryotic.
2) Bacteria as a group show most extensive metabolic activity.
3) Based on shape bacteria are grouped into two categories.
4) Most bacteria do not have cell wall.

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1 and 2 are correct, 3 and 4 are incorrect.
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3 and 4 are correct, 1 and 2 are incorrect.
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1 and 4 are correct, 2 and 3 are incorrect.
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2 and 3 are correct, 1 and 4 are incorrect.

Kingdom protista is not considered natural one because

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It has diverse mode of form, structure and nutrition.
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Of organisms like slime mould, which are totally different from all other organisms.
0%
Its members are from different evolutionary lines.
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All of the above.

A teacher was explaining about a constant physical contact involving almost equal physiological interdependence in two different thalloid forms. He was trying to explain, which one of the following?

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Mycorrhizal association
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Establishment of heterothallism
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Operation of heterothallism
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Advent of lichen formation

Yeast like budding of Oidia in Mucor / Rhizopus is called as

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Palmella
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Chantransia
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Torula
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Gongrosira

Short twisted strands of hyphae which serves as anchors for lichens are

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Mycelium
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Rhizines
0%
Roots
0%
Rhizoids

Parasexuality is involved with

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Fusion of gamete and protoplast.
0%
Fusion of male gamete with secondary nucleus.
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Fusion of cytoplasm.
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Fusion of male and female gamete.

Red rot of sugarcane and white rust of radish respectively are caused by

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Albugo candida and Cercospora
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Colletotrichum and Fusarium
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Pythium and Phytophthora
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Albugo candida and Puccinia graminis
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Colletotrichum and Albugo candida

Asexual reproduction in fungi takes place by

0%
Endospore
0%
Gametangia
0%
Conidiospore
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None of the above

Branched chain of lipids occur in the cell membranes of

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Archaebacteria
0%
Mycoplasma
0%
Actinomycetes
0%
Streptomyces

Zygospore is formed from

0%
Gametangial copulation
0%
Gametic union
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Zygote
0%
Oogamy

Which of the following induces sexual reproduction in Mucor/Rhizopus?

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Indole acetic acid
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Trisporic acid
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Gibberellic acid
0%
Citric acid

Torula stage of Mucor is rich in which of the following medium?

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Sugar
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Pesticide
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Antibiotic
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All of the above

Which statement about the archaean genome is true?

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It is much more similar to the bacterial genome than to eukaryotic genomes.
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More than half of its genes are never observed in bacteria or eukaryotes.
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It is much smaller than the bacterial genome.
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It is housed in the nucleus and no archaea genome has yet been sequenced.

Association between blue green algae and fungi is called as

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Lichens
0%
Xylem
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Phloem
0%
Predation

The symbiotic association between an alga and a fungus is called ________.

0%
Moss
0%
Lichens
0%
Root nodules
0%
Rhizopus

In lichens, medulla has

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Endodermis
0%
Hadrome
0%
Hypodermis
0%
Piliferous layer

Lichens grow at a very slow rate (1 mm per year). In how many years, a lichen matures?

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1 - 4 years
0%
4 - 8 years
0%
100 years
0%
20 - 25 years

The three domain system with six kingdom is the latest classification based on

0%
Mitochondrial genes
0%
Nuclear genes
0%
16S rRNA gene
0%
Chloroplast genes

The asexual spores of fungi produced at terminal ends or at intercalary places during extremely unfavourable conditions are

0%
Zoospores
0%
Chlamydospores
0%
Conidia
0%
Oidia

Archaebacteria can adjust to most adverse condition because of

0%
Straight chain lipids
0%
Branched lipids of cell membrane
0%
Unique glycoproteins
0%
Pseudomurein

Spirochaete bacteria are exceptional in showing fast locomotion through thick mucus because of the presence of

0%
Flagellin in flagellum
0%
Acidic proteins in flagellum
0%
Additional bundles of elastic fibres
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None of the above

Match the discoverers.

A. Bacteriophage	Adolf Meyr
B. Crystalization of virus	Stanley
C Reverse transcriptase	Temin and Baltimore
D. TMV	4. Felix d'Herelle

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A- 3, B- 2, C- 1, D- 4
0%
A- 4, B- 2, C- 3, D- 1
0%
A- 2, B- 3, C- 1, D- 4
0%
A- 3, B- 1, C- 2, D- 4

CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 15 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Biological Classification Quiz 15 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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