Chief feature of family Brassicaceae/Cruciferae is presence of

Options

A. Latex
B. Pectin
C. Alkaloids
D. Myrosin enzyme.

Explanation

To answer the question regarding the chief feature of the family Brassicaceae (also known as Cruciferae), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Family**: The family Brassicaceae, commonly referred to as the Cruciferae family, includes various plants such as cabbage, broccoli, and mustard.

2. **Understand the Characteristics**: Members of the Brassicaceae family are primarily herbaceous plants, which can be annual or biennial. A notable characteristic of this family is the presence of specific cells known as excretive cells.

3. **Focus on the Enzyme**: The excretive cells in Brassicaceae contain a unique enzyme called myrosine. This enzyme plays a crucial role in the metabolism of certain compounds within the plants.

4. **Function of Myrosine**: Myrosine enzyme hydrolyzes sulfur-containing glycosides into isothiocyanates, oils, and glucose. This biochemical reaction is significant as it contributes to the flavor and potential health benefits of many Brassicaceae plants.

5. **Evaluate the Options**: The options provided were latex, pectin, alkaloid, and myrosine enzyme.
- Latex is associated with other families like Euphorbiaceae.
- Pectin is a structural polysaccharide found in plant cell walls.
- Alkaloids are produced by various plant families but are not specific to Brassicaceae.
- Myrosine enzyme is specifically associated with the Brassicaceae family.

6. **Conclusion**: The chief feature of the Brassicaceae family is the presence of the myrosine enzyme, making option D the correct answer.