Question

In five kingdom system, the main basis of classification :-

• A. Structure of nucleus
• B. Nutrition
• C. Structure of cell wall
• D. Asexual reproduction

Answer 1

The Correct Option is B

The correct answer is Option B) Nutrition

In the five kingdom system, the main classification is done on the basis of the modes of nutrition. The other basis of classification is done on, organism cellular organization and other structural and functional attributes. The five kingdoms are as follows:

Monera: This includes prokaryotes, they are unicellular and lack a true nucleus and also the membrane bound organelles. They obtain their nutrients through absorption and photosynthesis. 

Protista: They include eukaryotic organisms.  They are generally unicellular; they have a variety of modes of nutrients like absorption, ingestion and photosynthesis. 

Fungi: They are eukaryotes that have a cell wall made of chitin. They are multicellular except for the yeast. Their mode of nutrition is absorption and they are fungal organisms. 

Plantae: They are multicellular eukaryotes. They have a cell wall of cellulose. They are autotrophs, that is they perform photosynthesis. They are terrestrial organisms that play a role in the food chain. 

Animals: Animalia comprises eukaryotic, multicellular organisms with no cell walls. Their mode of nutrition is ingestion and digestion. 

Read more from chapter: Biological Classification

Answer 2

The correct answer is Option B) Nutrition

Real Life Applications

• Diversity: It helps in understanding diversity as it can group the animals that have similar characteristics. They can be at diversity in the variety of life forms that exist on Earth. They can be at three levels: species, genetic, and ecosystem.
• Evolution and ancestry can also be studied with the help of the classification system.

Question can also be asked as

1. Explain the five-kingdom system of classification.
2. What are the criteria for the five-kingdom system of classification?
3. What are the advantages and disadvantages of the five-kingdom system of classification?

Answer 3

Classification is the process of grouping of the organisms into groups based on the similarities that are exhibited by them. The five kingdom classification is given by Robert H Wittaker. The characteristics such as mode of nourishment, thallus organization, cell structure, evolutionary relationships, and reproduction, were used to classify the organisms. There are five kingdoms Monera, Protista, Fungi, Plantae, animalia. 

Two kingdom classification 

Carlous Linnaeus gave the two kingdoms classification, namely Plantae and Animalia. It does not distinguish between eukaryotes and prokaryotes or photosynthetic to non-photosynthetic. 

Five criteria for the five kingdom classification

The criteria are as follows:

• The complexity of cellular structure, prokaryotes and eukaryotes 
• Complexity of body structure that includes multicellular and unicellular. 
• Phylogenetic connections 
• Producers, decomposers or the consumers 
• Mode of nutrients 

Kingdom Monera

• This includes eubacteria and are single celled. 
• They do not have well defined organelles 
• They do not have a prominent feeding mechanism 

Kingdom Protista  

• They are also single celled organisms.
• The movement is by cilia, flagella or amoeboid 
• No cell wall 
• They have organelles 
• Photosynthesis, ingestion are the modes of nutrition. 

Kingdom Fungi 

• Multicellular organism
• Have cell wall, organelles but no chloroplasts.
• Get nutrients from the decaying matter 
• Lack locomotion mechanism 

Kingdom Plantae 

• Plants are multicellular and do not move 
• They have a cell wall and chloroplast 
• They are autotrophs 

Kingdom Animalia 

• Animals are multicellular without the cell wall 
• They obtain nutrients through ingestion

Read more: 

Related Concepts
Biological Classification	Nutrition	Heterotrophs
Sexual reproduction in Fungi	Green algae	Viruses