Algal component in a lichen

Options

A. is called mycobiont
B. absorbs water from substratum
C. prepares food
D. lives as a parasite on fungus

Answer

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are a symbiotic association between two different organisms: algae and fungi. This relationship is mutually beneficial.

**Hint**: Remember that lichens are not just one organism but a combination of two different types.

2. **Identifying the Components**: In this association, the algal component is referred to as the **phycobiont**, while the fungal component is known as the **mycobiont**.

**Hint**: Focus on the terminology: "phycobiont" for algae and "mycobiont" for fungi.

3. **Function of the Algal Component**: The phycobiont (algal component) is autotrophic, meaning it can produce its own food through photosynthesis.

**Hint**: Think about how plants make their food; algae do the same in this partnership.

4. **Function of the Fungal Component**: The mycobiont (fungal component) is heterotrophic and provides shelter to the algal component. It also helps in the absorption of water and minerals from the environment.

**Hint**: Consider the role of fungi in nature; they often help in nutrient absorption.

5. **Evaluating the Options**:
- The first option incorrectly states that the algal component is the mycobiont. This is false; the algal component is the phycobiont.
- The second option claims that the algal component absorbs water, which is incorrect as this is the role of the mycobiont.
- The third option states that the algal component prepares food, which is correct.
- The fourth option incorrectly states that the algal component lives as a parasite on the fungus. This is false; they live in a symbiotic relationship.

**Hint**: Review each option carefully, focusing on the definitions and roles of the components.

### Final Answer:
The algal component in a lichen is known as the **phycobiont**, which is responsible for food production through photosynthesis.