In Head or Capitulum inflorescence

Options

A. Ray florets: pistillate and neuter, actinomorphic
B. Disc florets: bisexual, zygomorphic
C. Ray florets: plstillate or neuter, zygomorphic
D. Disc florets: pistillate, actinomorphic

Answer

### Step-by-Step Solution:

1. **Understanding Inflorescence**:
- Inflorescence refers to the arrangement of flowers on a plant. It is important to know the different types of inflorescence to understand the structure and function of flowers.

2. **Identifying Head or Capitulum Inflorescence**:
- In a head or capitulum inflorescence, the main stem (or axis) becomes flattened, forming a structure known as the receptacle. This is a key characteristic of this type of inflorescence.

3. **Types of Flowers in Capitulum**:
- There are two types of flowers present in the capitulum:
- **Ray Flowers**: These are located at the periphery of the inflorescence. They are typically pistillate (female) and zygomorphic (bilaterally symmetrical).
- **Disc Flowers**: These are found in the central part of the inflorescence. They are usually bisexual (having both male and female reproductive structures) and actinomorphic (radially symmetrical).

4. **Analyzing the Options**:
- The question provides several options regarding the characteristics of ray and disc flowers in the head or capitulum inflorescence.
- We need to evaluate each option based on the characteristics we identified:
- **Option 1**: Ray flowers are pistillate and neuter, and actinomorphic. This is incorrect because ray flowers are pistillate and zygomorphic, not neuter or actinomorphic.
- **Option 2**: Disc flowers are bisexual and zygomorphic. This is incorrect because disc flowers are bisexual and actinomorphic, not zygomorphic.
- **Option 3**: Ray flowers are pistillate and zygomorphic, and disc flowers are bisexual and actinomorphic. This is correct.

5. **Conclusion**:
- Based on the analysis, the correct answer is that ray flowers are pistillate and zygomorphic, while disc flowers are bisexual and actinomorphic.