In a flower of a plant, the number of carpels is equal to number of inner whorl of perianth lobes and cotyledons in the seed of that plant are 1/3 of carpel number. What is the arrangement of ovules on the placenta of the flower of that plant

Options

A. Axile
B. Marginal
C. Basal
D. Parietal.

Answer

To solve the question regarding the arrangement of ovules on the placenta of a flower, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Number of Carpels**:
- The question states that the number of carpels is equal to the number of inner whorl of perianth lobes.
- Let's denote the number of carpels as \( C \). Therefore, \( C = \text{Number of inner whorl of perianth lobes} \).

2. **Determine the Number of Cotyledons**:
- It is given that the number of cotyledons in the seed is one-third of the carpel number.
- Therefore, the number of cotyledons \( = \frac{C}{3} \).

3. **Relate the Cotyledons to the Family**:
- Since the number of cotyledons is one-third of the carpel number, we can deduce that if \( C = 3 \), then the number of cotyledons will be \( \frac{3}{3} = 1 \).
- This indicates that the plant belongs to the monocot family.

4. **Identify the Family**:
- The family that fits this description is the Liliaceae family, which is characterized by having three carpels and one cotyledon.

5. **Determine the Type of Placentation**:
- In the Liliaceae family, the ovary is typically superior and has a tricarpillary structure.
- The arrangement of ovules in this case is of the **axile placentation** type, where ovules are arranged centrally in a multilocular ovary.

6. **Conclusion**:
- Based on the above deductions, the arrangement of ovules on the placenta of the flower of that plant is **axile placentation**.

### Final Answer:
The arrangement of ovules on the placenta of the flower of that plant is **axile placentation**.

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