Tag: monera
Questions Related to monera
Golgi apparatus does not occur in
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Yeast
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Liver cells
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Higher plants
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Bacteria and blue green algae
Prokaryotes are unicellular organisms. They lack membrane-bound organelles like mitochondria, golgi apparatus. They also lack true nucleus. Instead, they have nucleoid or incipient nucleus. Nucleoid is an undifferetiated, unorganised, fibrillar nucleus without any limiting membrane. They have ribosomes in the cytoplasm. Examples include bacteria like E. coli, blue green algae.
Which of the following is not a moneran?
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Spirulina
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Nostoc
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Oscillatoria
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Euglena
Moneran are prokaryotic unicellular organisms. They lack membrane-bound organelles. They lack true nucleus. They have genetic material without nuclear envelope. The examples of Moneran include bacteria, blue green algae like Nostoc, Spirulina, Oscillatoria. Euglena is an eukaryotic organism
Prokaryotes are placed in a group known as
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Monera
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Pteridophytes
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Bryophyta
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Angiosperms
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.
Comma shaped bacteria are
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Bacilli
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Spirilla
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Vibrios
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Cocci
- 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.
In Whittaker's classification, non-nucleated unicellular organisms$/$ prokaryotes are included under
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Plantae
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Monera
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Protista
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Animalia
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.
These are the organisms which are called prokaryotes.
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Green algae, brown algae and red algae
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Yeasts and other fungi
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Mycoplasmas, bacteria, cyanobacteria
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None of the above groups
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
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Capsule
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Cell membrane
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Cell wall
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Nucleoid
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
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BGA
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Archaebacteria
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Fungi
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Mycoplasm
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.
Which one of the following statements is correct?
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Mostly bacteria are heterotrophic, but some are autotrophic
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All bacteria are heterotrophic
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All bacteria are autotrophic
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All bacteria are photosynthetic
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
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Kingdom Monera
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Kingdom Protista
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Kingdom Fungi
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Kingdom Plantae
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.
- 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.
- Kingdom Protista: Contains eukaryotic unicellular organisms like Amoeba. They have true membrane-bound organelles and nucleus.
- Kingdom Fungi: Eukaryotic multicellular (exception: yeast is unicellular) non-photosynthetic organisms
- Kingdom Plantae: Eukaryotic multicellular photosynthetic autotrophic organisms
- Kingdom Animalia: Eukaryotic multicellular heterotrophic organisms.