Top-shaped multicilate male gametes, and the mature seed which bears only one embryo with two cotyledons, are chracteristic features of

Options

A. Polypetalous angiosperms
B. Gamopetalous angiosperms
C. Conifers
D. Cycads

Answer

To solve the question regarding the characteristic features of a plant with top-shaped multiciliate male gametes and a mature seed that bears only one embryo with two cotyledons, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Features**: The question highlights two main features:
- Top-shaped multiciliate male gametes.
- A mature seed with one embryo and two cotyledons.

2. **Analyze the Options**: The options provided are:
- Polybutylase angiosperms
- Gangopatallic angiosperms
- Conifers
- Cycads

3. **Examine Cycads**:
- Cycads are a group of gymnosperms known for their unique reproductive structures.
- They produce the largest male gametes, which are often visible to the naked eye and are typically oval or top-shaped.
- The male gametes of cycads are multiciliate, meaning they have multiple flagella or cilia.

4. **Seed Characteristics**:
- After fertilization, cycads produce seeds that contain one embryo.
- The mature seeds of cycads have two cotyledons, which are the embryonic leaves.

5. **Confirm All Conditions**:
- The male gametes are top-shaped and multiciliate: **Condition Met**.
- The mature seed has one embryo with two cotyledons: **Condition Met**.

6. **Conclusion**: Since all the characteristics mentioned in the question are fulfilled by cycads, we conclude that the correct answer is:
- **Cycads** (Option 4).

### Final Answer:
The characteristic features described in the question are indicative of **Cycads**.

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