Which of the following are homosporous pteridophytes :(i) Selaginella (ii) Lycopodium (iii) Salvinia (iv) Equisetum

Options

A. i and iv only
B. ii and iii only
C. ii and iv only
D. iii and iv only.

Answer

To determine which of the given options are homosporous pteridophytes, we can follow these steps:

### Step 1: Understand the Definitions
First, we need to understand the terms involved:
- **Pteridophytes**: These are vascular plants that reproduce via spores and include ferns, horsetails, and clubmosses.
- **Homosporous**: This refers to plants that produce only one type of spore, which is typically of the same size and type, leading to the formation of a gametophyte that can produce both male and female gametes.
- **Heterosporous**: This refers to plants that produce two different types of spores, usually microspores (male) and megaspores (female).

### Step 2: Analyze Each Option
Now, let's analyze each of the given options:
1. **Selaginella**: This is a heterosporous pteridophyte, as it produces two types of spores (microspores and megaspores).
2. **Lycopodium**: This is a homosporous pteridophyte, producing only one type of spore.
3. **Salvinia**: This is also a heterosporous pteridophyte, producing two types of spores.
4. **Equisetum**: This is a homosporous pteridophyte, producing only one type of spore.

### Step 3: Identify the Homosporous Pteridophytes
From the analysis:
- **Homosporous Pteridophytes**: Lycopodium and Equisetum
- **Heterosporous Pteridophytes**: Selaginella and Salvinia

### Conclusion
Thus, the correct answer to the question is:
**(ii) Lycopodium and (iv) Equisetum** are the homosporous pteridophytes.

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