Fruit constricted between the seeds is observed in

Options

A. Ananas
B. Annona
C. Acacia
D. Artocarpus

Answer

To determine which fruit is constricted between the seeds, we can analyze the options provided:

1. **Ananas (Pineapple)**:
- Pineapple belongs to the family Bromeliaceae.
- The fruit of pineapple is formed from the entire inflorescence, meaning it is not constricted between seeds.

2. **Anona (Sugar Apple)**:
- Anona belongs to the family Anonaceae.
- The arrangement of seeds in sugar apple is compact, but it does not exhibit the characteristic of being constricted between seeds.

3. **Acacia**:
- Acacia produces a type of fruit known as a syrzocarpic fruit.
- In syrzocarpic fruits, the fruit is found in the middle of the seeds, and as it matures, it divides. This division causes the fruit to be constricted between the seeds.

4. **Arthrocarpus (Breadfruit)**:
- Arthrocarpus includes fruits like jackfruit and mulberry, which develop from the floral axis and do not show constriction between seeds.

Based on this analysis, the correct answer is **Acacia**, as it is characterized by fruits that are constricted between the seeds.

### Step-by-Step Solution:
1. **Identify the fruits listed in the options**: Ananas, Anona, Acacia, and Arthrocarpus.
2. **Analyze each fruit**:
- **Ananas**: Not constricted; entire inflorescence forms the fruit.
- **Anona**: Compact arrangement but not constricted.
- **Acacia**: Syrzocarpic fruit; constricted between seeds.
- **Arthrocarpus**: Not constricted; develops from floral axis.
3. **Determine the correct option**: Acacia is the only fruit that is constricted between the seeds.