Monoecious plant of Chara shows occurrence of

Options

A. Stamen and carpel on the same plant
B. Upper antheridium and lower oogonium on the same plant
C. Upper oogonium and lower antheridium on the same plant
D. Antheridiophore and archegoniophore on the same plant

Answer

To solve the question regarding the occurrence of reproductive structures in the monoecious plant Chara, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Monoecious Plants**:
- Monoecious plants are those that have both male and female reproductive organs on the same individual. This means that a single plant can produce both male gametes (sperm) and female gametes (eggs).

2. **Identify the Reproductive Structures in Chara**:
- In Chara, the male reproductive organ is called **Antheridium** and the female reproductive organ is called **Oogonium** (or Archegonium).

3. **Locate the Position of the Reproductive Structures**:
- The Antheridium (male organ) is located on the lower part of the plant, while the Oogonium (female organ) is found on the upper part of the plant.

4. **Analyze the Options Given**:
- The options provided are:
- a) Staminate, Carpal
- b) Upper Antheridium and Lower Oogonium
- c) Upper Oogonium and Lower Antheridium
- d) Antheridium 4 and Archegonium 4 on the same plant

5. **Evaluate Each Option**:
- a) Incorrect: Staminate refers to male flowers, and Carpal refers to female structures, which does not apply here.
- b) Incorrect: This option states that Antheridium is upper and Oogonium is lower, which is the opposite of their actual positions.
- c) Correct: This option states that Oogonium is upper and Antheridium is lower, which aligns with the known structure of Chara.
- d) Incorrect: This option incorrectly states the positions of Antheridium and Oogonium.

6. **Select the Correct Answer**:
- Based on the analysis, the correct answer is option **c) Upper Oogonium and Lower Antheridium on the same plant**.

### Final Answer:
The monoecious plant of Chara shows the occurrence of **Upper Oogonium and Lower Antheridium on the same plant**.

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