capitulum with two types of florets is called

Options

A. homogamous
B. isogamous
C. heterogamous
D. anisogamous

Answer

To solve the question "Capitulum with two types of florets is called," we need to analyze the terms related to inflorescence and the types of florets present in a capitulum.

### Step-by-Step Solution:

1. **Understanding Capitulum**:
- A capitulum, also known as a head, is a type of inflorescence that consists of many small, sessile florets arranged closely together on a common receptacle.

2. **Types of Florets**:
- In a capitulum, there are typically two types of florets:
- **Ray Florets**: These are usually found on the periphery of the capitulum. They are often pistillate (female) or neuter (sterile) and are zygomorphic (bilaterally symmetrical).
- **Disc Florets**: These are located in the center of the capitulum. They are typically bisexual (having both male and female reproductive structures) and actinomorphic (radially symmetrical).

3. **Classification of Capitulum**:
- When a capitulum has two distinct types of florets (ray and disc), it is classified as **heterogamous**. This term indicates the presence of florets that differ in their sexual structures.

4. **Eliminating Other Options**:
- **Homogamous**: This refers to flowers that do not differ sexually; all florets are similar.
- **Isogamous**: This term describes organisms that reproduce with gametes that are similar in size and shape, with no differentiation.
- **Anisogamous**: This refers to reproduction involving dissimilar gametes.

5. **Conclusion**:
- Based on the definitions and characteristics discussed, the correct answer to the question is that a capitulum with two types of florets is called **heterogamous**.

### Final Answer:
**Heterogamous**