Question

Monoecious plant of chara shows occurence of?

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

Answer 1

The correct option is A

Upper oogonium and lower antheridium on the same plant

The correct option is A.

Explanation of the correct option:

1. Chara is a green algal genus.
2. They have many cells and resemble terrestrial plants on the surface.
3. They prefer water that is less oxygenated and harder.
4. Stoneworts are a type of plant that is covered in calcium carbonate deposits.
5. Chara reproduces in two ways: sexually and vegetatively.
6. Chara's sexual reproduction is of the advanced monogamous variety.
7. The sex organs are enormous and macroscopic.
8. The male sex organ, known as the globule, is yellow to red.
9. The female sex organ, known as the nucleus or oogonium, is more or less oval and green in color.
10. The globule matures into antheridia filaments, which are antheridium cells.
11. Above the globule or antheridium, oogonium is always found solitary.

Explanation of the incorrect options:

Option B:

1. Upper and lower antheridium globules are male reproductive structures, whereas upper and lower round antheridium globules and nuclei are found on the same plant.

Option C:

1. A bisexual (or "perfect") flower has both stamens and carpels, while a unisexual (or "imperfect") flower has neither stamens nor carpels (and is called staminate).

Option D:

1. This is not relevant to the above question.

Final Answer: Monoecious plants on the chart show the occurrence of upper oogonium and lower antheridium on the same plant.