Monoecious plant of Chara shows occurrence of

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Monoecious Plants**: Monoecious plants are those that have both male and female reproductive structures on the same individual. This means that a single plant can produce both sperm and eggs.

2. **Identifying Chara**: Chara is a genus of green algae that is multicellular and exhibits both asexual and sexual reproduction. In sexual reproduction, Chara is known to be oogamous, meaning it produces large, non-motile eggs (oospheres) and smaller motile sperm.

3. **Sexual Structures in Chara**: In Chara, the male reproductive organ is called the antheridium, which is typically yellow to red in color and is globular in shape. The female reproductive organ is called the oogonium, which is usually oval and green.

4. **Arrangement of Reproductive Organs**: In monoecious Chara, the arrangement of these reproductive organs is such that the oogonium (female organ) is located above the antheridium (male organ) on the same plant.

5. **Choosing the Correct Option**: Given the options provided:
- Option 1: Upper antheridium and lower oogonium on the same plant (Incorrect)
- Option 2: Upper oogonium and lower antheridium on the same plant (Correct)
- Option 3: Antheridiophore and archegoniophore on the same plant (Incorrect)
- Option 4: Stamen and carpal on the same plant (Incorrect)

The correct answer is **Option 2: 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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