Which one of the following is a matching pair of certain organism(s) and the kind of association ?

Options

A. Shark and sucker fish - Commensalism
B. Algae and fungi in lichens -Commensalism
C. Orchids growing on trees -Parasitism
D. Cuscuta (dodder) growing on other flowering plants - Epiphytism

Explanation

To determine which pair of organisms and their association is correct, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - Shark and Sucker Fish
- The relationship between a shark and a sucker fish is an example of commensalism. In this type of relationship, one organism (the sucker fish) benefits by gaining a place to live and food scraps, while the other organism (the shark) is neither helped nor harmed.
- **Conclusion**: This is a valid matching pair for commensalism.

### Step 2: Analyze the second option - Algae and Fungi in Lichens
- Lichens are a symbiotic association between algae and fungi. In this case, both organisms benefit from the relationship; algae provide food through photosynthesis, while fungi provide structure and protection.
- **Conclusion**: This is not commensalism; it is mutualism, making this option incorrect.

### Step 3: Analyze the third option - Orchid growing on Trees
- Orchids that grow on trees do so for support but do not harm the tree. This relationship is an example of commensalism as the orchid benefits from the tree without harming it.
- **Conclusion**: This option is incorrectly labeled as parasitism; it is actually commensalism, making this option incorrect.

### Step 4: Analyze the fourth option - Cascuta (Dodder) growing on other flowering plants
- Cascuta is a parasitic plant that wraps around other plants and derives nutrients from them. This relationship is not merely for support; it harms the host plant by taking its nutrients.
- **Conclusion**: This is not epiphytism; it is parasitism, making this option incorrect.

### Final Conclusion
After analyzing all the options, the only correct matching pair is:
- **Shark and Sucker Fish** - Commensalism.