Inflorescence is capitulum in family

Options

A. Solanaceae
B. Asteraceae
C. Poaceae
D. Cruciferae.

Answer

### Step-by-Step Solution

1. **Understanding the Question**: The question asks about the family of flowering plants where the inflorescence is in the form of a capitulum.

2. **Defining Capitulum**: A capitulum is a type of inflorescence that resembles a single flower but is actually a cluster of many small flowers (florets) tightly packed together. It is also known as a racemose head.

3. **Identifying the Family**: The family that is characterized by the capitulum inflorescence is the **Asteraceae** family, also known as the **Compositae** family.

4. **Examples of Plants**: Common examples of plants in the Asteraceae family include:
- Sunflower (Helianthus annuus)
- Cosmos (Cosmos bipinnatus)
- Zinnia (Zinnia elegans)

5. **Structure of Capitulum**: In the capitulum of a sunflower, what appears to be a single flower is actually made up of:
- **Ray florets**: The petal-like structures that form the outer part.
- **Disc florets**: The small flowers that are found in the central part of the capitulum.

6. **Involucre**: The capitulum is often surrounded by a whorl of bracts known as the **involucre**, which can consist of one or more layers.

7. **Eliminating Incorrect Options**: The question may provide multiple-choice options. Based on the information:
- Families such as Solanaceae (potato family), Poaceae (grass family), and Cruciferae (mustard family) do not have capitulum inflorescence.
- Therefore, the correct answer is Asteraceae (Compositae).

8. **Conclusion**: The family where the inflorescence is a capitulum is the **Asteraceae** family.