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A mutually beneficial association necess...

A mutually beneficial association necessary for survival of both partners are

A

mutualism/symbiosis

B

Commensalism

C

amensalism

D

Both (a) and (b)

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks for a type of association between two organisms that is mutually beneficial and necessary for the survival of both partners. 2. **Identifying Key Terms**: The terms "mutually beneficial" and "necessary for survival" are crucial. These terms indicate that both organisms rely on each other for their existence. 3. **Exploring Types of Relationships**: - **Symbiosis**: This is a type of relationship where two different organisms live together and both benefit from the association. In symbiosis, the survival of both partners is dependent on each other. - **Protocorporation**: This is also a mutually beneficial relationship, but the key difference is that the partners can survive independently of each other. 4. **Examples of Symbiosis**: - **Pollination**: A plant and its pollinator (like a bee) depend on each other for reproduction and food. - **Lichens**: Composed of algae and fungi, where algae provide food through photosynthesis and fungi absorb minerals. - **Mycorrhiza**: A relationship between fungi and plant roots where fungi help in nutrient absorption and plants provide food and shelter. 5. **Conclusion**: Based on the definitions and examples, the type of association that is mutually beneficial and necessary for the survival of both partners is called **Symbiosis**. ### Final Answer: The mutually beneficial association necessary for the survival of both partners is called **Symbiosis**.
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks for a type of association between two organisms that is mutually beneficial and necessary for the survival of both partners. 2. **Identifying Key Terms**: The terms "mutually beneficial" and "necessary for survival" are crucial. These terms indicate that both organisms rely on each other for their existence. 3. **Exploring Types of Relationships**: - **Symbiosis**: This is a type of relationship where two different organisms live together and both benefit from the association. In symbiosis, the survival of both partners is dependent on each other. ...
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