Question

The correct floral formula of soyabean is
A. \[\% ⚥\]\[{K_{\left[ 5 \right]}}{C_{1 + 2 + \left[ 2 \right]}}{A_{1 + \left[ 9 \right]}}{G_{\underline 1 }}\]
B. \[\% ⚥\]\[{K_{\left[ 5 \right]}}{C_{1 + \left[ 2 \right] + 2}}{A_{\left[ 9 \right] + 1}}{G_{\overline 1 }}\]
C. \[\% ⚥\]\[{K_{\left[ 5 \right]}}{C_{1 + \left[ 2 \right] + 2}}{A_{\left[ 9 \right] + 1}}{G_{\underline 1 }}\]
D. \[\% ⚥\]\[{K_{\left[ 5 \right]}}{C_{1 + 2 + \left[ 2 \right]}}{A_{\left[ 9 \right] + 1}}{G_{\underline 1 }}\]

Answer 1

Hint: Soyabean belongs to the family of Fabaceae. This family is characterized by the presence of both polypetalous and gamopetalous corolla, diadelphous condition of the androecium, and a hypogynous ovary.

Complete answer: Soyabean or Glycine max is a leguminous plant of the family Fabaceae. Fabaceae is also known as the Pea family. Its old name was Papilionaceae. Earlier it was a sub-family. It is also known as the Pulse family as most plants of this family are used as pulses.
The floral formula diagram of the Fabaceae family is as follows –

Flowers of Fabaceae have a zygomorphic symmetry. It is known as bilateral symmetry. The flower can be divided into two parts through one plane only. It is denoted by the symbol % in the floral formula. Also, the flowers of soyabean or the Fabaceae family are bisexual. Bisexual flowers are denoted by the symbol ⚥ in the floral formula.
The calyx is made up of five sepals. Sepals have a gamosepalous condition. This means that all five sepals are fused. It is denoted as \[{K_{\left[ 5 \right]}}\] in the floral formula.
The corolla has 5 petals too. It has vexillary aestivation of descending imbricate aestivation. It consists of 1 large petal and 2 small petals. Two very small petals are fused to form the keel. Corolla has a mixed condition of polypetalous and gamopetalous petals. It is a distinguishing feature of this family. The polypetalous condition means the petals are free. Three petals out of five are free. Two petals are similar whereas the third one is different. The gamopetalous condition means that the petals are fused. Two petals out of five are fused. It is denoted by the \[{C_{1 + 2 + \left[ 2 \right]}}\] in the floral formula.
Androecium has a diadelphous condition. There are ten filaments. Nine filaments are fused to form one single bundle and one filament is free. It is denoted by \[{A_{\left[ 9 \right] + 1}}\] condition.
The ovary is a monocarpellary containing 1 carpel. It is unilocular having one chamber. Also, it is hypogynous which means that the ovary is superior and is located above all the other whorls of the flower. It is denoted by \[{G_{\underline 1 }}\] in the floral formula.
Thus, based on the above information we can conclude that the correct floral formula of soyabean is \[\% \]⚥\[{K_{\left[ 5 \right]}}{C_{1 + 2 + \left[ 2 \right]}}{A_{\left[ 9 \right] + 1}}{G_{\underline 1 }}\].
Hence, the correct answer is an option (D).

Note: Floral formula refers to the representation of the structure of the flower using the letters, numbers, and various other symbols that represent the various whorls and other parts of the flower. It is used to represent particular species or families of flowers.