Which of the following statement is false about Fabaceae?

The correct option is "It is common to find plants with fibrous root system here".

Let us analyze the statements about the family Fabaceae step-by-step to understand why this statement is false:
1. Classification and Nomenclature: Fabaceae was earlier referred to as Papilionoideae, which is a subfamily of the family Leguminosae. Thus, the statements "It was earlier mentioned to as Papilionoideae" and "It is a subfamily of family Leguminosae" are botanically correct.
2. Distribution: The members of this family are widely distributed all over the world. Thus, the statement "It is widely distributed across the world" is also correct.
3. Root System: Fabaceae is a major family of dicotyledonous plants (legumes). Dicotyledonous plants are characterized by a tap root system, often with root nodules containing nitrogen-fixing bacteria (like Rhizobium). In contrast, a fibrous root system is characteristic of monocotyledonous plants (such as wheat, paddy, and grasses). Therefore, it is incorrect to state that it is common to find plants with a fibrous root system in Fabaceae.