A collection of sporangia attached to placenta and covered over by indusium is known as

Options

A. sorus
B. sporophyll
C. ramenta
D. spike

Answer

To answer the question, "A collection of sporangia attached to placenta and covered over by indusium is known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, we need to define the key terms in the question.
- **Sporangia**: These are structures that produce and contain spores.
- **Placenta**: In this context, it refers to the tissue in ferns where sporangia are attached.
- **Indusium**: This is a protective covering that can be found over the sporangia in ferns.

2. **Identifying the Options**:
- The options given are:
- A) Sorus
- B) Sporophyll
- C) Romanta
- D) Spike

3. **Analyzing Each Option**:
- **Option A: Sorus**: A sorus is indeed a collection of sporangia that are attached to the placenta and often covered by an indusium. This matches the description in the question.
- **Option B: Sporophyll**: This refers to a leaf that bears sporangia, which does not match the description of a collection of sporangia.
- **Option C: Romanta**: This term refers to the brown scales found on the edges of leaves, which is unrelated to sporangia.
- **Option D: Spike**: This term refers to a mass of scales or structures, which does not fit the description either.

4. **Conclusion**:
- After analyzing all the options, the correct answer is **Sorus**. A sorus is a collection of sporangia attached to a placenta and often covered by an indusium.

### Final Answer:
The collection of sporangia attached to a placenta and covered over by indusium is known as **Sorus**.

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