Question

In china rose the flowers are :

• A. Zygomorphic, epigynous with twisted aestivation
• B. Actinomorphic, hypogynous with twisted aestivation
• C. Actinomorphic, epigynous with valvate aestivation
• D. Zygomorphic, hypogynous with imbricate aestivation

Answer 1

The Correct Option is B

The question involves identifying specific floral characteristics of the China rose, which is a common name for Hibiscus rosa-sinensis. Let's break down the features mentioned in the options to determine the correct answer.

1. Actinomorphic Flowers: These are flowers that are radially symmetrical, meaning they can be divided into two identical halves through multiple planes. The China rose exhibits radial symmetry, so its flowers are actinomorphic.
2. Hypogynous Flowers: In hypogynous flowers, the ovary is positioned above other flower parts such as sepals, petals, and stamens. In the case of the China rose, it is found that the ovary is located above the other structures, thus confirming the hypogynous nature.
3. Twisted Aestivation: Aestivation refers to the arrangement of sepals and petals in the bud, with "twisted" being a common type where each sepal or petal is partly overlapped by the next one. The China rose exhibits twisted aestivation in its petals.

Now, examining the options provided:

• Zygomorphic, epigynous with twisted aestivation: This is incorrect because zygomorphic flowers have bilateral symmetry, and epigynous flowers have the ovary below the other structures.
• Actinomorphic, hypogynous with twisted aestivation: This is the correct description based on the features identified above.
• Actinomorphic, epigynous with valvate aestivation: This is incorrect as the China rose is not epigynous and does not have valvate aestivation.
• Zygomorphic, hypogynous with imbricate aestivation: This is incorrect because the flowers are actinomorphic, not zygomorphic, and they have twisted aestivation, not imbricate.

Hence, the correct answer is: Actinomorphic, hypogynous with twisted aestivation.