what is true ?

Options

A. umbel is reacmose inflorescence where stalked flowers aggregate on a flat rececptacle
B. in receme the main axis is shortened and flowers are borne acropetally
C. spadix is a racemose inflorescence having sessile flowers
D. spike is a reacmose inflorescence having sessile flowers.

Answer

To determine which statement is true regarding inflorescence, we will analyze each of the four statements provided.

### Step-by-Step Solution:

1. **Evaluate Statement 1**:
- **Statement**: "Umbil is Brassimose in fluorescence where stocked flowers aggregate on a flat receptacle."
- **Analysis**: The term "umbil" refers to a type of inflorescence where the main axis is shortened, and flowers arise from bracts. However, the description of flowers aggregating on a flat receptacle is characteristic of a "Capitulum," not "Brassimose." Therefore, this statement is **false**.

2. **Evaluate Statement 2**:
- **Statement**: "In Resimi, the main axis is shortened and flowers are born acrobatically."
- **Analysis**: The correct term is "Raceme," where the main axis is elongated, and flowers are borne in acropetal succession (older flowers at the base). The statement incorrectly states that the main axis is shortened. Thus, this statement is also **false**.

3. **Evaluate Statement 3**:
- **Statement**: "Spadix is a racemos in fluorescence having flowers."
- **Analysis**: A "Spadix" is a type of inflorescence that is fleshy and typically has both male and female flowers, surrounded by a large bract called a spathe. While it is true that a spadix is a type of racemose inflorescence, it does not have sessile flowers. Therefore, this statement is **false**.

4. **Evaluate Statement 4**:
- **Statement**: "Spike is a racemos inflorescence having sessile flowers."
- **Analysis**: A "Spike" is indeed a type of racemose inflorescence where the main axis is unbranched, and it has sessile (stalkless) flowers. This statement is **true**.

### Conclusion:
The only true statement among the four provided is:
- **Statement 4**: "Spike is a racemos inflorescence having sessile flowers."