10 Questions
What is a characteristic feature of eubacteria?
Presence of a rigid cell wall
What is the primary role of chemosynthetic autotrophic bacteria?
Oxidising inorganic substances to produce ATP
What is the term for the process by which bacteria produce ATP by oxidising inorganic substances?
Chemosynthesis
What is the function of heterocysts in cyanobacteria?
Fixing atmospheric nitrogen
What is the primary role of heterotrophic bacteria in nature?
Decomposing organic matter
What is the term for the reproduction method used by bacteria under unfavourable conditions?
Spore formation
Which of the following is NOT a characteristic of cyanobacteria?
Presence of a flagellum
What is the role of cyanobacteria in polluted water bodies?
Forming blooms
What is the term for the process by which bacteria produce new individuals?
Fission
What is the primary benefit of heterotrophic bacteria in human affairs?
All of the above
Study Notes
Characteristics of Eubacteria
- Characterized by the presence of a rigid cell wall
- If motile, have a flagellum
Cyanobacteria (Blue-Green Algae)
- Have chlorophyll a, similar to green plants
- Photosynthetic autotrophs
- Can be unicellular, colonial, or filamentous
- Found in freshwater, marine, or terrestrial environments
- Colonies are often surrounded by a gelatinous sheath
- Can form blooms in polluted water bodies
- Some can fix atmospheric nitrogen in specialized cells called heterocysts (e.g., Nostoc and Anabaena)
Chemosynthetic Autotrophic Bacteria
- Oxidize inorganic substances (nitrates, nitrites, ammonia) to produce ATP
- Play a crucial role in recycling nutrients (nitrogen, phosphorus, iron, sulfur)
Heterotrophic Bacteria
- Most abundant type of bacteria in nature
- Important decomposers
- Some have a significant impact on human affairs (e.g., making curd from milk, producing antibiotics, fixing nitrogen in legume roots)
- Some are pathogens, causing diseases like cholera, typhoid, tetanus, and citrus canker
Reproduction of Bacteria
- Mainly reproduce by fission
- Can produce spores under unfavorable conditions
Test your knowledge of eubacteria and cyanobacteria, including their cell walls, motility, and photosynthetic capabilities. Learn about the characteristics that distinguish these types of bacteria and their habits.
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