A stamen with two anther lobes and four pollen sacs is called

Options

A. monothecous
B. dithecous
C. exserted
D. tetrathecous

Answer

To solve the question regarding the classification of a stamen with two anther lobes and four pollen sacs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Stamen**:
- A stamen is the male reproductive part of a flower, consisting of two main parts: the anther and the filament. The filament is the stalk that supports the anther, which is the part that produces pollen.

2. **Identify the Key Features**:
- The question specifies that the stamen has **two anther lobes** and **four pollen sacs**.

3. **Analyze the Options**:
- **Monothecus**: This term refers to a stamen with one anther lobe.
- **Dithecus**: This term refers to a stamen with two anther lobes. Since the question mentions two anther lobes, this option is relevant.
- **Exerted**: This term describes the position of the stamens when they protrude out of the flower but does not pertain to the number of lobes or pollen sacs.
- **Tetrothecus**: This term refers to a stamen with four lobes, which does not match the description given in the question.

4. **Determine the Correct Answer**:
- Since the stamen in question has **two anther lobes**, it corresponds to the term **Dithecus**. The mention of four pollen sacs aligns with the structure of a dithecus stamen, as each lobe can contain two pollen sacs.

5. **Conclusion**:
- Therefore, the correct answer to the question is **Dithecus**.

### Final Answer:
**Dithecus**