Question

In china rose the flowers are_____.

• A. actinomorphic, epigynous with valvate aestivation
• B. zygomorphic, epigynous with twisted aestivation
• C. actinomorphic, hypogynous with twisted aestivation
• D. zygomorphic, hypogynous with imbricate aestivation

Answer 1

The correct option is C

actinomorphic, hypogynous with twisted aestivation

The correct option is C:

Explanations of the correct option:

Option C:

1. The china rose flower is also known as the shoe flower.
2. Its scientific name is Hibiscus rosa-sinensis.
3. It is actinomorphic, hypogynous with twisted aestivation.
4. Actinomorphic flowers are flowers that have radial symmetry.
5. Aestivation is known as the arrangement of petals and sepals on the whorl in relation to another.
6. In twisted aestivation, one margin of the petal overlaps the margin of the next petal.
7. A hypogynous flowers are a flower in which the female reproductive organ (gynoecium) occupies the highest position of the flower above other parts.

Explanations of the incorrect options:

Option A:

1. Plants with actinomorphic symmetry have multiple planes of symmetry as they have radial symmetry.
2. An epigynous ovary has a fused gynoecium with petals and sepals of the whorl located above it.
3. In valvate aestivation the petals of the whorl touch each other edge to edge.
4. This is an incorrect option as the china rose does not have valvate aestivation.

Option B:

1. In a zygomorphic flower the parts of a flower are unequal in size.
2. The floral parts have only a longitudinal symmetry, hence have bilateral symmetry.
3. Epigynous flowers have petals and sepals that appear to be present above the ovary as the hypanthium (enlarged receptacle) is fused to the gynoecium.
4. Twisted aestivation the margin of the petal overlaps with the margin of the successive petal.
5. This is an incorrect option as the china rose is not a flower with zygomorphic symmetry and an epigynous ovary.

Option D:

1. Zygomorphic flowers have bilateral symmetry.
2. Hypogynous flowers have a superior ovary.
3. In imbricate aestivation the whorls of a flower are arranged irregularly any specific pattern.
4. This is an incorrect option.

Final answer: In china rose the flowers are actinomorphic, hypogynous with twisted aestivation.