Tag: biology

Questions Related to biology

Prokaryotes are placed in a group known as 

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. Monera

  2. Pteridophytes

  3. Bryophyta

  4. Angiosperms

Show answer
Correct Option: A
Explanation:

Prokaryotes are placed in a group Monera. These includes bacteria, Cyanobacteria, Eubacteria, etc. They are unicellular organisms. They have cell wall. They lack membrane-bound organelles like mitochondria. They also lack true nucleus. Instead, they have nucleoid, a genetic material without nuclear envelope.

Thus, the correct answer is 'Monera.'

Comma shaped bacteria are

biology classification of plants monera five kingdoms of living organisms biodiversity and need of classification

  1. Bacilli

  2. Spirilla

  3. Vibrios

  4. Cocci

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Correct Option: C
Explanation:

  • Bacteria having rod-shaped structure are called as Bacilli. Examples include Clostridium tetani, Corynebacterium.
  • Bacteria having spiral shape are called as Spirilla. Examples include Spirillum, Campylobacter.
  • Bacteria having a comma-like single curve in their body are Vibrio. Examples include Vibrio cholerae, Vibrio vulnificus.
  • Bacteria that are round in shape are called as cocci. Examples include Streptococcus pneumoniae, Staphylococcus aureus. 
Thus, the correct answer is 'Vibrios.'

In Whittaker's classification, non-nucleated unicellular organisms$/$ prokaryotes are included under

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. Plantae

  2. Monera

  3. Protista

  4. Animalia

Show answer
Correct Option: B
Explanation:

Whittaker's classification includes five kingdom classification system. The five kingdoms include Monera, Protista, Fungi, Plantae, and Animalia. Monera includes Eubacteria and Archeobacteria. They include non-nucleated unicellular organisms. They are prokaryotes. They have a cell wall. They have no membrane-bound organelles and true nucleus.

Thus, the correct answer is 'Monera.'

These are the organisms which are called prokaryotes.

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. Green algae, brown algae and red algae

  2. Yeasts and other fungi

  3. Mycoplasmas, bacteria, cyanobacteria

  4. None of the above groups

Show answer
Correct Option: C
Explanation:

Prokaryotes are all single-celled organisms eg, Mycoplasmas, bacteria, cyanobacteria. So, the correct option is C.(Mycoplasmas, bacteria, cyanobacteria)

Bacteria come in different shapes. The part of the bacterial cell that gives them shape is the

biology classification of plants monera five kingdoms of living organisms biodiversity and need of classification

  1. Capsule

  2. Cell membrane

  3. Cell wall

  4. Nucleoid

Show answer
Correct Option: C
Explanation:

The cell wall is a rigid layer that gives shape to the bacterial cell. It also protects the bacteria from the external environment.

Death factor is secreted by 

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. BGA

  2. Archaebacteria

  3. Fungi

  4. Mycoplasm

Show answer
Correct Option: A
Explanation:

Cyanobacteria (Blue-green algae or BGA) sometimes reproduce exponentially to form blooms. Blooming cyanobacteria can secrete death factors in such concentrations that they poison and even kill animals and humans. It can also accumulate in other animals such as fish and shellfish and cause poisonings such as shellfish poisoning.

So, the correct answer is 'BGA'.

Which one of the following statements is correct?

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. Mostly bacteria are heterotrophic, but some are autotrophic

  2. All bacteria are heterotrophic

  3. All bacteria are autotrophic

  4. All bacteria are photosynthetic

Show answer
Correct Option: A
Explanation:

Most bacteria are heterotrophic, however, a special class of bacteria called cyanobacteria or BGA are autotrophic, that is they can produce there own food. So, the correct option is A. ( Mostly bacteria are heterotrophic, but some are autotrophic )

Organisms which are considered to be the most primitive group in the world are grouped under

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. Kingdom Monera

  2. Kingdom Protista

  3. Kingdom Fungi

  4. Kingdom Plantae

Show answer
Correct Option: A
Explanation:

According to the "Five kingdom system of classification" proposed by R. H. Whittaker in 1969, all living organisms are classified under 5 kingdoms. The names and characteristics are explained below.

  1. Kingdom Monera:  Contains unicellular, prokaryotic, organisms like bacterial species. These are the most primitive organisms with no defined or true nucleus and no membrane-bound organelles. 
  2. Kingdom Protista: Contains eukaryotic unicellular organisms like Amoeba. They have true membrane-bound organelles and nucleus.
  3. Kingdom Fungi: Eukaryotic multicellular (exception: yeast is unicellular) non-photosynthetic organisms
  4. Kingdom Plantae:  Eukaryotic multicellular photosynthetic autotrophic organisms
  5. Kingdom Animalia: Eukaryotic multicellular heterotrophic organisms.
Here, only Kingdom Monera is consists of prokaryotic organisms and thus it is considered the most primitive group.

What is the shape of Bacillus thuringiensis bacteria?

biology classification of plants monera five kingdoms of living organisms biodiversity and need of classification

  1. Rod shaped

  2. Comma shaped

  3. Spiral shaped

  4. None of these

Show answer
Correct Option: A
Explanation:

Bacillus thuringiensis, by the name 'bacillus', suggests that these are rod-shaped bacteria as bacillus is the term used for rod-shaped bacteria. So, the correct option is 'Rod-shaped'.

How many of the following are prokaryotes?
Yeast, Nitrosomonas, Amoeba, paramoecium, Archaebacteria, Mycoplasma, Nostoc, Gonyaulax

biology biodiversity and classification monera five kingdoms of living organisms biodiversity and need of classification

  1. 7

  2. 4

  3. 5

  4. 6

Show answer
Correct Option: B
Explanation:

Nitrosomonas, Archaebacteria, Mycocoplasma and Nostoc are prokaryotes.

So the correct answer is '4'