The incorrect among the following is

Options

A. Salvia shows variation in the length of filaments within a flower
B. Mustard has polycarpellary ayncarpous gynoecium
C. In Argemone, ovary is one-chambered but it because two chambered due to formation due to formation of a false septum
D. In cucumber, the gynoecium occupies the highest position while the other floral parts are situated below it

Answer

To solve the question regarding the incorrect statement among the given options, we can analyze each statement one by one:

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Salvia shows variation in the length of filaments within a flower."
- **Analysis:** This statement is correct. In Salvia, the condition known as didynamous occurs, where there are two pairs of stamens with different lengths.

**Hint:** Check if the statement aligns with known botanical characteristics of Salvia.

2. **Analyze the Second Statement:**
- **Statement:** "Mustard has polycarpillary and carpus gynoecium."
- **Analysis:** This statement is also correct. Mustard flowers exhibit a syncarpous gynoecium, which means the carpels are fused together, and they can be considered polycarpillary.

**Hint:** Recall the structure of the gynoecium in mustard and its classification.

3. **Analyze the Third Statement:**
- **Statement:** "In Argemone, the ovary is one-chambered but it becomes two-chambered due to the formation of the false septum."
- **Analysis:** This statement is correct. The ovary in Argemone is indeed one-chambered but can appear two-chambered due to the presence of a false septum.

**Hint:** Consider the anatomical features of Argemone's ovary and the role of the false septum.

4. **Analyze the Fourth Statement:**
- **Statement:** "In cucumber, the gynoecium occupies the highest position while the other flower parts are situated below it."
- **Analysis:** This statement is incorrect. In cucumbers, the ovary is actually inferior, meaning that the other flower parts are positioned above the ovary.

**Hint:** Review the definitions of superior and inferior ovaries in flowering plants.

### Conclusion:
The incorrect statement among the options is the fourth statement regarding cucumber.

### Final Answer:
The incorrect statement is: "In cucumber, the gynoecium occupies the highest position while the other flower parts are situated below it."

---