Morphologically different types of spores are produced by

Options

A. Lycopodium and Dryopoteris
B. Lycopodium and salvinia
C. Equisetum and Dryopoteris
D. Selaginella and salvinia

Answer

To solve the question "Morphologically different types of spores are produced by," we need to understand the concepts of heterospory and homospory in plants, particularly focusing on pteridophytes.

### Step-by-Step Solution:

1. **Understand the Types of Spores**:
- Spores are reproductive units in plants. They can be classified into two categories based on their morphology:
- **Homospores**: One type of spore is produced, which can develop into a bisexual gametophyte.
- **Heterospores**: Two different types of spores are produced, which are:
- **Megaspores**: Larger, typically female spores.
- **Microspores**: Smaller, typically male spores.

2. **Identify Heterosporous Plants**:
- Plants that produce morphologically different spores (heterospores) are known as heterosporous plants. Examples include:
- **Selaginella**: Produces both megaspores and microspores.
- **Salvinia**: Also produces both types of spores.

3. **Evaluate the Options**:
- The question provides four options. We need to identify which of these options includes plants that are heterosporous:
- **Option 1**: Lycopodium and Dryopteris - Both are homosporous.
- **Option 2**: Lycopodium and Salvinia - Lycopodium is homosporous, while Salvinia is heterosporous.
- **Option 3**: Equisetum and Dryopteris - Both are homosporous.
- **Option 4**: Selaginella and Salvinia - Both are heterosporous.

4. **Select the Correct Answer**:
- The only option that includes two plants that produce morphologically different types of spores is **Option 4: Selaginella and Salvinia**.

### Final Answer:
Morphologically different types of spores are produced by **Selaginella and Salvinia**.

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