Explain the difference between commensalism and mutualism types of interactions, with the help of a suitable example of each.

The correct answer is the comparison table distinguishing between Mutualism and Commensalism:

Step-by-Step Explanation:

1. Understanding Mutualism (+/+)
Mutualism is a positive interspecific interaction where both interacting species derive benefit from each other. The relationship is often highly co-evolved and obligatory for the survival of one or both species.
Example of Mutualism: Lichens represent an intimate mutualistic relationship between a fungus and photosynthetic algae or cyanobacteria. The fungus provides structural support, shelter, and absorbs water and minerals, while the alga prepares food through photosynthesis, benefiting both organisms.

2. Understanding Commensalism (+/0)
Commensalism is an interaction where one species (the commensal) benefits, while the other species (the host) remains unaffected—neither helped nor harmed. It is generally a non-obligatory relationship for the host.
Example of Commensalism: An orchid growing as an epiphyte on the branch of a mango tree. The orchid benefits by getting physical support and better access to sunlight, while the mango tree is neither harmed nor benefited by the presence of the orchid.

3. Breakdown of Key Differences
• Nature of Benefit: In mutualism, both participating organisms profit (dual benefit). In commensalism, only one organism gains a benefit, while the other remains neutral.
• Dependency (Obligatory vs. Non-Obligatory): Mutualism is typically obligatory (the partners are dependent on each other for survival), whereas commensalism is non-obligatory (the host can easily live without the commensal).
• Subcategories: Mutualistic relationships are categorized based on functions like nutrition (e.g., mycorrhizae), transport/pollination, defense, and shelter. Commensal relationships are classified into types like metabiosis (using something produced by another), inquilinism (using another organism for housing), microbiota, and phoresy (using another for transport).