Select an incorrect statement w.r.t. capitulum inflorescence of sunflower

Options

A. Main axis becomes a flat receptacle
B. Florets are sessile and many in number
C. Ray florets are bisexual
D. Disc florets are actinomorphic

Answer

To solve the question about selecting an incorrect statement regarding the capitulum inflorescence of sunflower, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Capitulum Inflorescence**:
- The capitulum inflorescence is characterized by a dense cluster of flowers that are closely packed together. In sunflowers, this structure is commonly referred to as a "head."

2. **Identify the Types of Flowers**:
- In the capitulum of a sunflower, there are two types of flowers: ray florets and disc florets.
- Ray florets are typically found on the outer edge and are often larger and more petal-like.
- Disc florets are located in the center and are usually smaller.

3. **Determine the Characteristics of Ray and Disc Florets**:
- Ray florets are **pistillate**, meaning they have female reproductive organs but do not have functional male organs.
- Disc florets are **bisexual**, meaning they contain both male and female reproductive organs.

4. **Analyze the Statements**:
- Now, we need to evaluate the statements provided in the question:
- **Statement 1**: The main axis becomes flat and has a receptacle. (Correct)
- **Statement 2**: Flowers are sessile and many in number. (Correct)
- **Statement 3**: Ray florets are bisexual. (Incorrect, as they are pistillate)
- **Statement 4**: Disc florets are bisexual. (Correct)

5. **Select the Incorrect Statement**:
- Based on the analysis, the statement that ray florets are bisexual is incorrect. Therefore, this is the answer to the question.

### Final Answer:
The incorrect statement regarding the capitulum inflorescence of sunflower is: **Ray florets are bisexual.**