A gymnosperm lacking archegonium is

Options

A. Pinus
B. Ephedra
C. Cycas
D. Gnetum.

Answer

To solve the question "A gymnosperm lacking archegonium is," we can follow these steps:

### Step 1: Understand Gymnosperms
Gymnosperms are a group of seed-producing plants that have seeds that are not enclosed in an ovary (hence "naked seeds"). They include various species, and it's important to know their reproductive structures.

**Hint:** Review the characteristics of gymnosperms and their reproductive structures.

### Step 2: Identify Archegonium
The archegonium is the female reproductive organ in many plants, including some gymnosperms. It is responsible for producing eggs. Knowing which gymnosperms possess or lack archegonia is crucial.

**Hint:** Look into the reproductive structures of different gymnosperm groups.

### Step 3: Analyze the Options
The options given are:
- A) Ephrydra
- B) Cycas
- C) Genetum

We need to determine which of these options lacks archegonia.

**Hint:** Compare the reproductive structures of Ephrydra, Cycas, and Genetum.

### Step 4: Evaluate Each Option
- **Ephrydra:** This gymnosperm does have archegonia.
- **Cycas:** This is another gymnosperm that contains archegonia.
- **Genetum:** This is the only option that is known to lack archegonia.

**Hint:** Focus on the specific characteristics of Genetum in relation to archegonia.

### Step 5: Conclusion
Based on the analysis, the gymnosperm that lacks archegonium is **Genetum**.

**Final Answer:** D) Genetum