Question

In China rose the flowers are?

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

Answer 1

The correct option is A

actinomorphic, hypogynous with twisted aestivation

The correct option is option A.

Explanation of correct option:

1. The positional arrangement of the parts of a flower within a flower bud before it opens is known as aestivation.
2. Actinomorphic symmetry is a type of flower symmetry that is radially symmetrical and capable of being divided into essentially symmetrical halves by any longitudinal plane.
3. Zygomorphic symmetry is indicated by floral elements that are uneven in size or form, allowing the flower to be divided into virtually symmetrical halves by only one longitudinal plane going through the axis.
4. One margin of a petal covers a neighboring petal, while the other margin is covered by another petal in twisted Aestivation.
5. Imbricate aestivation occurs when the edges of petals overlap in such a way that one petal is completely external and the other completely inner.
6. Sepals or petals in a whorl of valvate aestivation just meet by their edges without overlapping.
7. If sepals, petals, and stamens emerge from the top of the ovary or from a hypanthium placed above the ovary, the flower is epigynous.
8. If the sepals, petals, and stamens are linked to the receptacle below the ovary, the flower is hypogynous.

Final answer: China rose has actinomorphic, hypogynous with twisted aestivation.