Select the incorrect statement for vexillary or papilionaceous aestivation ?

Options

A. Two lateral petals are found which are termed as wing.
B. The standard petal is posterior .
C. The largest petal is anterior and overlaps wing .
D. Two smallest anterior petals are present known as keel.

Answer

To solve the question regarding the incorrect statement for vexillary or papilionaceous aestivation, we can follow these steps:

### Step 1: Understand Vexillary Aestivation
Vexillary or papilionaceous aestivation is a specific arrangement of petals in certain flowers, particularly in the Fabaceae family (legumes). In this arrangement:
- There are five petals: one large petal called the "standard," two lateral petals known as "wings," and two smaller petals that are fused together to form the "keel."

### Step 2: Identify the Petal Arrangement
1. **Standard Petal**: This is the largest petal and is located at the top. It is often referred to as the "anterior" petal.
2. **Wing Petals**: There are two lateral petals that are positioned below the standard petal.
3. **Keel Petals**: The two smallest petals are located at the bottom and are fused together, forming the keel.

### Step 3: Analyze the Statements
Now, let's evaluate the statements provided in the question:
1. **Statement 1**: Two lateral petals are formed or found which are termed as wings. (Correct)
2. **Statement 2**: The standard petal is posterior. (Incorrect)
3. **Statement 3**: The largest petal is anterior and overlaps wings. (Correct)
4. **Statement 4**: The smallest anterior petals are known as keel. (Incorrect)

### Step 4: Determine the Incorrect Statement
From the analysis:
- The incorrect statement is **Statement 2**: "The standard petal is posterior." This is incorrect because the standard petal is actually anterior (at the top).

### Final Answer
The incorrect statement regarding vexillary or papilionaceous aestivation is that the standard petal is posterior.

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