Question

In fabaceae, one of the following immediately encloses the essential organs
A) Anterior petals
B) Posterior petals
C) Lateral petals
D) Sepals

Answer 1

Irregular flowers are flowers of the pea family Fabaceae, with 5 petals forming a recognizable banner, wings and keel form. A single petal with two lobes is the banner. It is often referred to as a standard petal.

Complete answer:
First we should know about fabaceae to answer this question. A large and economically valuable family of flowering plants is the Fabaceae or Leguminosae, generally known as the legume, bean or pea family. It comprises shrubs, trees, and annual or perennial herbaceous plants, easily identified through their fruit and stipulates compound leaves. Among angiosperms, it is the third biggest family after Orchidaceae and Asteraceae.
Now, let us find the solution from the options-
Fabaceae is a large and economically important flowering plant family of papilionaceous corolla. The petals in Fabaceae are 5-the main petal is the outermost posterior petal (standard or vexillum) and it encloses all the vital organs, two lateral petals and the two anterior and innermost petals are fused together to create a boat-shaped structure known as the carina or keel.
From these we came to know that options A, C, and D are incorrect.

Thus, the correct answer is option ‘B’ Posterior petals.

Note: The systematic name of the plant family that is generally known as the Pea family is Fabaceae. It is made up of three subgroups: Caesalpinioideae, Papilionoideae, and Mimosoideae. Fabaceae is the most widespread genus present in the Americas and Africa in tropical rainforests and in dry forests.