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The unequally thickened wall of fern spo...

The unequally thickened wall of fern sporangium that helps in dehescence is

A

Indusium

B

Placenta

C

Annulus

D

Receptacle.

Text Solution

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The correct Answer is:
To solve the question regarding the unequally thickened wall of the fern sporangium that aids in dehiscence, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Structure of Ferns**: - Ferns belong to the group known as pteridophytes. They have a complex life cycle that includes a sporophyte stage, which is the dominant phase. 2. **Identify the Role of Sporangia**: - In ferns, sporangia are specialized structures that produce spores through the process of meiosis. These spores are essential for the reproduction of ferns. 3. **Examine the Wall of the Sporangium**: - The sporangium has a wall that is not uniformly thick. This structural feature is crucial for the process of dehiscence, which is the release of spores. 4. **Identify the Specific Structure**: - The specific part of the sporangium that has an unequally thickened wall is known as the **annulus**. The annulus is located on the outer layer of the sporangium. 5. **Understand the Function of the Annulus**: - During dehiscence, the annulus breaks down, allowing the spores stored inside the sporangium to be released into the environment for potential germination and growth. 6. **Select the Correct Answer**: - Given the options provided (Indurcium, Placenta, Annulus, Receptacle), the correct answer is **C. Annulus**. ### Final Answer: The unequally thickened wall of the fern sporangium that helps in dehiscence is **C. Annulus**. ---
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