Given below are two statements: Statement I: Brassica juncea has been evolved after hybridization. Statement II: B. nigra crossed with B. campestris resulted in B. juncea.

Correct option is A

Brassica juncea is an amphidiploid species that originated through natural hybridization followed by chromosome doubling. It evolved from the interspecific cross between B. nigra and B. campestris. This process resulted in a stable species with combined genomes of both parents. Hence, both statements regarding the origin of Brassica juncea are correct.
Information booster: The evolution of Brassica species is explained by the Triangle of U concept. B. juncea contains A and B genomes, derived from its parental species. Such hybridization events are important in crop evolution and plant breeding. Brassica juncea is widely cultivated as an oilseed crop in India.
Why other options are incorrect: (b) This option is incorrect because both statements are scientifically correct. (c) This option is incorrect since statement II correctly explains statement I. (d) This option is incorrect because neither statement is false.