Biological Classification Test

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Biological Classification Test - 54

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Question 1
1 / -0

The bacteria were regarded to be plants because:

A
Some of them are green

B
They are present every where

C
Some of them cannot move

D
They have a rigid cell wall

Solution

Bacteria are unicellular organisms. They are prokaryotes. They lack cell organelles and a well-defined nucleus. Plants are multicellular organisms. They are eukaryotes. They have organelles and well-defined nucleus. However, both plants and bacteria have a rigid cell wall. Hence, bacteria were regarded to be plants in earlier classifications.
So, the correct answer is option D.
Question 2
1 / -0

Biogas is produced by

A
Eubacteria

B
Archaebacteria

C
Mycoplasma

D
Cyanobacteria

Solution

Methanogens are responsible for methane gas production in biogas. Methanogen belongs to Archaebacteria class. Archeae are prokaryotic bacteria. They have no cell nucleus. They are classified as Archaebacteria.
Thus, the correct answer is 'Archaebacteria.'
Question 3
1 / -0

Rickettsiae is a group of

A
Viruses

B
Microorganisms

C
Bacteria

D
PPLO

Solution

Rickettsia are group of bacteria that are obligate intracellular parasites. They are considered a separate group of bacteria as they are spread arthropod vectors. They have cell wall like bacteria and have no flagella. They are gram-negative bacteria.
Thus, the correct answer is 'Bacteria.'
Question 4
1 / -0

Bacteria are thought to be primitive organisms because they

A
Are small, microscopic plants, which cannot be seen by naked eye

B
Cause serious diseases in human beings, domesticated animals and crop plants

C
Produce endospores which are very resistant to adverse conditions

D
Possess incipient nucleus and show division similar to amitosis

Solution

Bacteria are prokaryotic organisms who lack a membrane-bound nucleus and other membrane-bound organelles like mitochondria, chloroplasts. They are thought to be primitive organisms because they possess an incipient nucleus and show division similar to amitosis. Amitosis is a method of cell division in which spindle fibers are not formed.
Thus, the correct answer is 'Possess incipient nucleus and show division similar to amitosis.'
Question 5
1 / -0

The bacteria that commonly live in animal and human intestine is

A
Vibrio cholerae

B
Bacillus anthracis

C
Corynebacterium

D
Escherichia coli

Solution

Escherichia coli (E. coli) is a bacteria that commonly lives in the lower intestine of warm-blooded organisms like animal and human. Most strains of E. coli are harmless and they are the part of the normal flora of the gut. However, certain strains of E. coli may cause cramps, discomfort and food poisoning.
Thus, the correct answer is 'Escherichia coli.'
Question 6
1 / -0

An obligate anaerobe is

A
Ulothrix

B
Spirogyra

C
Methane bacteria

D
Onion

Solution

Obligate anaerobes are organisms which grow in absence of oxygen. In presence of oxygen, they cannot survive. The example includes methane producing bacteria or methanogens. They obtain their energy without consumption of oxygen. Other examples include Clostridium species.
Thus, the correct answer is 'Methane bacteria.'
Question 7
1 / -0

Food poisoning and gas forming rod-shaped bacterium is

A
Shigella

B
Salmonella

C
Clostridium

D
Escherichia coli

Solution

Clostridium bacteria is one of the most cause of food poisoning. It is a rod-shaped Gram-positive bacteria. It is a causative agent of botulism disease. It is a gas forming bacteria. It causes causative agent of botulism Gas gangrene by producing gas in tissues in gangrene.
Thus, the correct answer is 'Clostridium.'
Question 8
1 / -0

Bacteria differ from viruses in

A
Pathogenic nature

B
Genetic material

C
Having well defined cytoplasm

D
Lacking proper nucleus

Solution

Bacteria and viruses both are pathogenic in nature. They both cause disease in humans and animals. They both possess genetic material. Bacteria possess single-stranded circular DNA. Virus possesses either DNA or RNA as genetic material. They both lack proper membrane-bound nucleus unlike in eukaryotes. Bacteria have a well-defined cytoplasm within the cell membrane. However, virus lacks well defined cytoplasm.
Thus, the correct answer is 'Having well-defined cytoplasm.'
Question 9
1 / -0

Escherichia coli is used extensively in biological research as it is

A
Easily cultured

B
Easily available

C
Easy to handle

D
Easily multiplied in host

Solution

Escherichia coli is used extensively in biological research like protein engineering and genetic research due to several reasons. It has relatively small genome size. It is easily cultured. It has a high growth rate compared to complex organisms. It is a well-studied model organism.
Thus, the correct answer is 'Easily cultured.'
Question 10
1 / -0

Bacteria and other monerans do not possess:

A
Ribosomes

B
Mitochondria

C
Plasma membrane

D
Cell wall

Solution

Bacteria and other monerans are prokaryotes. They are unicellular organisms. They are made up of a single cell bound by a plasma membrane and lack membrane-bound organelles like mitochondria, Golgi complex. They lack a true nucleus as well. Instead, they possess genetic material without a nuclear envelope called the nucleoid. They also contain ribosomes in the cytoplasm.
Thus, the correct answer is option B.

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Biological Classification Test - 54

Result

Biological Classification Test - 54

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SHARING IS CARING

Question 1

Some of them are green

They are present every where

Some of them cannot move

They have a rigid cell wall

Solution

Question 2

Eubacteria

Archaebacteria

Mycoplasma

Cyanobacteria

Solution

Question 3

Viruses

Microorganisms

Bacteria

PPLO

Solution

Question 4

Are small, microscopic plants, which cannot be seen by naked eye

Cause serious diseases in human beings, domesticated animals and crop plants

Produce endospores which are very resistant to adverse conditions

Possess incipient nucleus and show division similar to amitosis

Solution

Question 5

Vibrio cholerae

Bacillus anthracis

Corynebacterium

Escherichia coli

Solution

Question 6

Ulothrix

Spirogyra

Methane bacteria

Onion

Solution

Question 7

Shigella

Salmonella

Clostridium

Escherichia coli

Solution

Question 8

Pathogenic nature

Genetic material

Having well defined cytoplasm

Lacking proper nucleus

Solution

Question 9

Easily cultured

Easily available

Easy to handle

Easily multiplied in host

Solution

Question 10

Ribosomes

Mitochondria

Plasma membrane

Cell wall

Solution

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