Which is the only living representative of Sphenopsida that has an underground, creeping and perennial rhizome that gives off aerial as well as underground branches?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. Equisetum.
The only living representative of Sphenopsida with an underground, creeping, and perennial rhizome that produces both aerial and underground branches is Equisetum (horsetail). Equisetum species are known for their distinctive jointed stems and are often found in moist environments. The plant's rhizomes allow it to spread and persist over time, contributing to its unique growth habit within the Sphenopsida class.