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

Hint: China rose or Hibiscus rosa-sinensis is a species of tropical flowering plant that belongs to the family Malvaceae. It is a shrubby tree and is grown as an ornamental plant. It grows in the tropical and subtropical areas of the world.

Complete answer:
China rose is a bushy evergreen shrub or small tree with glossy leaves and solitary flowers. The flowers are large, conspicuous. The flowers are trumpet shaped and consists of five petals with a variety of colors. The bottom of the bud consists of calyx and is green in color. The calyx consists of pointed tips which are called the sepals. The female part of the ovary is a tube like and long structure which is the pistil. The top of the pistil contains the stigma where pollen is collected. The stamen or the male reproductive part, consists of stem like filaments and each filament ends into the anther or the pollen producing parts.
The flowers in China rose is complete, bisexual, pentamerous, actinomorphic, hypogynous with twisted aestivation and solitary. Actinomorphic flowers are the flowers that can be divided into three or more identical parts. These identical parts are related to each other by the rotation of the center of the flowers. These flowers are also known as regular flowers. China rose flowers the hypogynous property as the gynoecium is placed above all the other parts of the flower. The other parts may arise from the single point but they are placed below the gynoecium. This type of ovary is known as superior ovary and found in plants such as China rose, mustard, brinjal etc. The hypogynous arrangement of flowers are present in a twisted aestivation.
Zygomorphic flowers are flowers that can be divided into only a single plane into two identical parts. This type of arrangement is found in the orchids and flowers of members of the family Lamiales.
Epigynous flowers are known as inferior ovaries and the margin of thalamus grows upwards enclosing the ovary completely and gets fused with it. It is found in plants such as guava and cucumber etc.

Hence, the correct answer is option (B).

Note: China rose flowers are five petaled and brightly colored. The flowers in China rose show an actinomorphic and hypogynous arrangement. The sepals and petals in the flowers of China rose are arranged in a twisted aestivation in which they are overlapping in nature. The ovary is superior and gynoecium rises above the other parts.