Which of the following is an example of saprophytes?

Options

A. Agraricus
B. Lichen
C. Chlamydomonas
D. Ferns

Answer

To solve the question "Which of the following is an example of saprophytes?" we need to analyze each option provided:

1. **Agaricus**: This is a genus of mushrooms, which are fungi. Fungi, including Agaricus, are known for their saprophytic mode of nutrition, meaning they feed on dead and decaying organic matter. Therefore, Agaricus is a correct example of a saprophyte.

2. **Lichen**: Lichens are not saprophytes; they are a symbiotic association between fungi and algae (or cyanobacteria). The algae perform photosynthesis and provide food, while the fungi help in nutrient absorption. Thus, this option is incorrect.

3. **Chlamydomonas**: This is a unicellular green alga that can perform photosynthesis (autotrophic nutrition) and can also absorb organic matter (heterotrophic nutrition) under certain conditions. However, it is not primarily a saprophyte. Therefore, this option is incorrect.

4. **Ferns**: Ferns are vascular plants that are autotrophic, meaning they produce their own food through photosynthesis. They do not feed on dead organic matter, so this option is also incorrect.

Based on this analysis, the only correct answer is **Agaricus**, which is an example of a saprophyte.

### Step-by-Step Solution:
1. Identify the term "saprophytes" which refers to organisms that feed on dead and decaying organic matter.
2. Analyze the first option, **Agaricus**: Recognize that it is a fungus that feeds on decaying matter, making it a saprophyte.
3. Examine the second option, **Lichen**: Understand that lichens are a symbiotic relationship and do not fit the definition of saprophytes.
4. Look at the third option, **Chlamydomonas**: Note that it can be autotrophic and heterotrophic but is not primarily a saprophyte.
5. Consider the fourth option, **Ferns**: Acknowledge that ferns are autotrophic and do not feed on dead organic matter.
6. Conclude that the only option that fits the definition of saprophytes is **Agaricus**.

### Final Answer:
The correct answer is **Agaricus**.