Question

In China rose, the flowers are
A) Actinomorphic, hypogynous, with twisted aestivation.
B) Actinomorphic, epigynous with valvate aestivation.
C) Zygomorphic, hypogynous with imbricate aestivation.
D) Zygomorphic, epigynous with twisted aestivation.

Answer 1

Aestivation is the positional arrangement of the parts of a flower within a flower bud before it has opened.

Complete Answer:
Actinomorphic isa type of flower symmetry where it is distinguished by being radially symmetrical and capable of division by any longitudinal plane into essentially symmetrical halves. Plants like tulip are actinomorphic in nature.
Zygomorphic isa type of flower symmetry where it is distinguished by having floral parts unequal in size or form so that the flower is capable of division into essentially symmetrical halves by only one longitudinal plane passing through the axis.
Epigynous is the arrangement of different parts of flowers where the hypanthium is fused to the gynoecium, and the free parts of the sepals, petals, and stamens appear to be attached to the top of the gynoecium, as in the apple (Malus; Rosaceae); the ovary is inferior, and the petals, sepals, and stamens appear to arise from the top of the ovary.
In hypogynous flowers, the perianth and stamens are attached to the receptacle below the gynoecium; the ovary is superior to these organs, and the remaining floral organs arise from below the point of origin of the carpel.
In, twisted Aestivationone margin of a petal covers adjacent petal and the other margin is covered by another petal, in imbricate the flower where the margins of petals overlap each other in such a way that one petal is completely external, one petal is completely internal, whereas in valvate Sepals or petals in a whorl just meet by their edges without overlapping.
China rose is actinomorphic, hypogynous, with twisted aestivation.

Thus, the correct answer is option A (Actinomorphic, hypogynous, with twisted aestivation).

Note: China rose belongs to the family Malvaceae. It’s scientific name is Hibiscus rosa-sinensis. It is widely cultivated in tropical and sub-tropical regions, most likely originated in Asia.