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-Competition
C. Orchids growing on trees-Parasitism
D. Cuscuta (dodder) growing on other flowering plants-Epiphytism

Answer

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

### Step-by-Step Solution:

1. **Identify the first pair: Shark and Suckerfish - Commensalism**
- In this relationship, the suckerfish attaches to the shark's body. The suckerfish benefits by gaining shelter, while the shark is neither harmed nor benefited.
- **Conclusion**: This relationship is correctly identified as commensalism.

2. **Identify the second pair: Algae and Fungi in Lichens - Competition**
- Algae and fungi form a symbiotic relationship known as lichens. In this association, both organisms benefit from each other; algae provide food through photosynthesis, and fungi provide structure and protection.
- **Conclusion**: This is not competition; it is mutualism.

3. **Identify the third pair: Orchids growing on trees - Parasitism**
- Orchids grow on trees but do not harm them. They use the trees for support and do not derive nutrients from them. This relationship is one where the orchids benefit from the trees without causing harm.
- **Conclusion**: This is not parasitism; it is commensalism.

4. **Identify the fourth pair: Cuscuta (Dodder) growing on other flowering plants - Parasitism**
- Cuscuta is a parasitic plant that attaches to host plants and derives nutrients from them. It does not perform photosynthesis and relies entirely on its host for sustenance.
- **Conclusion**: This relationship is correctly identified as parasitism.

### Final Answer:
The correct matching pair is **Shark and Suckerfish - Commensalism**.