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Primary protonema is present in...

Primary protonema is present in

A

Agaricus

B

Alternaria

C

Sphagnum

D

Funaria.

Text Solution

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The correct Answer is:
**Step-by-Step Text Solution:** 1. **Understanding the Question**: The question asks about the presence of primary protonema in certain organisms. Protonema is a stage in the life cycle of certain plants, particularly bryophytes. 2. **Identifying the Options**: The options provided are: - Option 1: Agaricus - Option 2: Alternaria - Option 3: Sphagnum - Option 4: Funaria 3. **Analyzing Each Option**: - **Agaricus**: This is a genus of fungi (mushrooms) and does not have a protonema stage. - **Alternaria**: This is a genus of fungi known for causing plant diseases and also does not have a protonema stage. - **Sphagnum**: This is a type of moss and does have a protonema stage, but it is not the primary protonema being asked about. - **Funaria**: This is a genus of mosses (bryophytes) that is well-known for having a primary protonema stage in its life cycle. 4. **Conclusion**: Based on the analysis, the correct answer is **Option 4: Funaria**. Funaria exhibits a primary protonema stage which develops from the germinating spore. 5. **Explanation of Protonema**: The primary protonema in Funaria starts as a germinating tube that lengthens and branches off to form a filamentous structure. This structure is initially colorless and filled with chlorophyll-containing cells called chloronemata. Over time, these develop into a mature protonema. 6. **Final Answer**: Therefore, the primary protonema is present in **Funaria**. ---
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