Five-Kingdom Classification Practice Questions
20 free Five-Kingdom Classification practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Who proposed the Five Kingdom Classification in the year 1969?
- A Carolus Linnaeus
- B R.H. Whittaker
- C Aristotle
- D Carl Woese
Correct answer: R.H. Whittaker
R.H. Whittaker proposed the Five Kingdom Classification in 1969. He expanded the existing systems to include Monera, Protista, Fungi, Plantae, and Animalia.
Which of the following was NOT a main criterion used by Whittaker for his classification system?
- A Structure of the organism's cells
- B The mode of nutrition acquisition
- C Underlying phylogenetic relationships
- D Presence or absence of locomotive organs
Correct answer: Presence or absence of locomotive organs
Whittaker's main criteria were cell structure, body organization, mode of nutrition, reproduction, and phylogenetic relationships. Locomotion was not one of the primary five criteria used to define the kingdoms.
Under the Five Kingdom system, all prokaryotic organisms are grouped together in Kingdom:
- A Protista
- B Monera
- C Fungi
- D Archaea
Correct answer: Monera
Kingdom Monera serves as the sole group for all prokaryotic organisms, such as bacteria and cyanobacteria. This separate grouping is based on the absence of a defined nuclear membrane.
Which kingdom includes unicellular eukaryotic organisms?
- A Monera
- B Fungi
- C Protista
- D Plantae
Correct answer: Protista
Kingdom Protista was created to bring together unicellular eukaryotic organisms like Chlamydomonas, Amoeba, and Paramoecium. This resolved the previous confusion of placing them with plants or animals.
In the Five Kingdom Classification, fungi are placed in a separate kingdom primarily due to their:
- A Unicellular nature
- B Saprophytic mode of nutrition
- C Prokaryotic cell structure
- D Ability to perform photosynthesis
Correct answer: Saprophytic mode of nutrition
Fungi were separated from plants because they are heterotrophic (mostly saprophytic) and have chitin in their cell walls. Plants, conversely, are autotrophic and possess cellulosic cell walls.
What is the cell wall composition of organisms belonging to Kingdom Fungi?
- A Cellulose
- B Peptidoglycan
- C Chitin
- D Silica
Correct answer: Chitin
Most fungi possess a cell wall made of chitin and polysaccharides. This chemical difference is a key reason why they are classified separately from the cellulose-walled plants.
In Whittaker's system, 'Body Organization' refers to the complexity of the organism. Which kingdom shows only cellular level organization?
- A Monera
- B Plantae
- C Animalia
- D Fungi
Correct answer: Monera
Kingdom Monera consists of unicellular prokaryotes, representing the simplest cellular level of organization. Protista is also unicellular but eukaryotic, while other kingdoms show tissue or organ levels.
Chlamydomonas and Chlorella were placed in _______ in earlier systems, but are now in _______ according to Five Kingdom classification.
- A Protista, Algae
- B Algae, Protista
- C Monera, Protista
- D Plantae, Monera
Correct answer: Algae, Protista
Earlier systems placed them in Algae within Plantae due to their cell walls. Under Whittaker's system, all unicellular eukaryotes are moved to Kingdom Protista.
The mode of nutrition for Kingdom Animalia is described as:
- A Autotrophic (self-feeding)
- B Holozoic or Saprophytic
- C Chemosynthetic autotrophy
- D Photosynthetic autotrophy
Correct answer: Holozoic or Saprophytic
Animals are heterotrophic organisms that primarily ingest food (holozoic) or sometimes live on decaying matter (saprophytic). They lack chlorophyll and cannot synthesize their own food.
Which of the following is a drawback of the earlier Two-Kingdom classification system?
- A It did not distinguish between eukaryotes and prokaryotes.
- B It did not distinguish between unicellular and multicellular organisms.
- C It did not distinguish between photosynthetic and non-photosynthetic organisms.
- D All of the above.
Correct answer: All of the above.
The Two-Kingdom system (Plantae and Animalia) was insufficient because it grouped bacteria with plants and fungi with plants, ignoring fundamental differences in cell type and nutrition.
Kingdom Monera is characterized by which type of nuclear membrane?
- A Present
- B Absent
- C Present only in some
- D Double layered
Correct answer: Absent
As prokaryotes, members of Kingdom Monera lack a nuclear membrane. Their genetic material lies naked in the cytoplasm in a region called the nucleoid.
Which kingdom shows the most metabolic diversity?
- A Plantae
- B Animalia
- C Monera
- D Fungi
Correct answer: Monera
Kingdom Monera (bacteria) exhibits the greatest metabolic diversity. They can be photoautotrophs, chemoautotrophs, saprophytes, or parasites.
The three-domain system of classification divides Kingdom Monera into:
- A Two domains
- B Three domains
- C Four kingdoms
- D One domain
Correct answer: Two domains
The three-domain system (proposed by Carl Woese) divides the prokaryotic Monera into two domains: Archaea and Bacteria, while all eukaryotes form the third domain, Eukarya.
In the Five Kingdom Classification, the phylogenetic relationship refers to:
- A Morphological and structural similarities
- B Evolutionary history and ancestry
- C Ecological niche and habitat preference
- D Mode and pattern of reproduction
Correct answer: Evolutionary history and ancestry
Phylogenetic relationship is one of Whittaker's criteria, referring to the evolutionary links and common ancestry between different groups of organisms.
Organisms with 'Holozoic' nutrition are typically found in:
- A Kingdom Monera
- B Kingdom Fungi
- C Kingdom Animalia
- D Kingdom Plantae
Correct answer: Kingdom Animalia
Holozoic nutrition involves the ingestion of complex organic matter. This is a characteristic feature of Kingdom Animalia.
Which kingdom includes organisms that are multicellular, eukaryotic, and have a cell wall made of cellulose?
- A Fungi
- B Monera
- C Plantae
- D Protista
Correct answer: Plantae
Kingdom Plantae consists of multicellular eukaryotes that are primarily autotrophic and possess a rigid cell wall composed of cellulose.
What happens to the boundaries of Kingdom Protista in the Five Kingdom system?
- A They are fixed and well-defined.
- B They are not well-defined and overlap with other kingdoms.
- C They include only photosynthetic organisms.
- D They exclude all organisms with cell walls.
Correct answer: They are not well-defined and overlap with other kingdoms.
The boundaries of Protista are not well-defined because what may be a 'photosynthetic protist' to one biologist may be considered a 'plant' by another.
Nuclear membranes are present in which of the following kingdoms?
- A Monera only
- B Protista, Fungi, Plantae, and Animalia
- C Plantae and Animalia only
- D Monera and Protista only
Correct answer: Protista, Fungi, Plantae, and Animalia
The nuclear membrane is a feature of eukaryotic cells. Therefore, it is present in all kingdoms except Monera (which is prokaryotic).
Which kingdom consists of organisms that are mostly multicellular decomposers?
- A Protista
- B Fungi
- C Animalia
- D Monera
Correct answer: Fungi
Fungi are the primary multicellular decomposers in ecosystems. They break down organic matter externally and absorb the resulting nutrients.
Whittaker’s system improved on Linnaeus’s system primarily by accounting for:
- A The colour and external appearance of the organism
- B The natural habitat and ecological niche occupied
- C Complexity of cell structure and mode of nutrition
- D The presence or absence of a vertebral column
Correct answer: Complexity of cell structure and mode of nutrition
Whittaker introduced cellular complexity (prokaryotic vs eukaryotic) and nutritional modes as fundamental criteria, which the Linnaean two-kingdom system lacked.