What do the terms phycobiont and mycobiont signify?

Explanation

### Step-by-Step Solution

1. **Understanding Symbiotic Relationships**: The terms phycobiont and mycobiont are related to a specific type of symbiotic relationship known as lichen. In this relationship, two different organisms, algae and fungi, live together and benefit from each other.

2. **Defining Phycobiont**: The term "phycobiont" refers specifically to the algal component of this symbiotic relationship. Algae are photosynthetic organisms that can produce their own food through photosynthesis. In the context of lichens, the phycobiont is responsible for providing nutrition to the partner organism, which is the fungus.

3. **Defining Mycobiont**: On the other hand, "mycobiont" refers to the fungal component of the lichen. Fungi do not perform photosynthesis; instead, they absorb nutrients from their surroundings. In the lichen partnership, the mycobiont provides minerals and structural support to the phycobiont.

...