Filamentous cyanobacteria often divide by which of the following methods?

• A. Budding
• B. Binary fission
• C. Conjugation
• D. Fragmentation

Answer: (B)

Verified step by step guidance

1. Understand the nature of filamentous cyanobacteria: These are a type of bacteria that form long chains or filaments. They are photosynthetic and play a crucial role in aquatic ecosystems.
2. Review the concept of binary fission: Binary fission is a common method of asexual reproduction in bacteria where a single cell divides into two identical daughter cells. This process involves the replication of the bacterial DNA followed by the division of the cytoplasm.
3. Consider the process of fragmentation: Fragmentation is a method of reproduction where an organism breaks into two or more fragments, each capable of growing into a new organism. In filamentous cyanobacteria, this can occur when a filament breaks into smaller pieces, each of which can develop into a new filament.
4. Differentiate between the methods: Budding involves the formation of a new organism from a small bud on the parent, which is not typical for cyanobacteria. Conjugation involves the transfer of genetic material between bacterial cells, which is a form of genetic exchange rather than reproduction.
5. Conclude with the most likely method: Given the nature of filamentous cyanobacteria and their structure, fragmentation is a plausible method of division, as it allows the filaments to break and form new chains.