Question

Which one is a Water Fern?

• A. Azolla
• B. Salvinia
• C. Marsilea
• D. All the above

Answer 1

The correct option is D All the above

• Azolla is a genus of seven species of aquatic ferns belonging to family Salviniaceae. They are extremely reduced in form and specialized. They look similar to duckweeds and mosses.
  
• Salvinia, commonly known as Watermoss is a genus belonging to family Salviniaceae. It is a floating aquatic fern. Salvinia is related to other water ferns such as Azolla.
  
• Marsilea, commonly known as water clover and four-leaf clover is a genus of approximately 65 species of aquatic ferns belonging to family Marsileaceae.
  
• Hence Azolla, Salvinia and marsilea are water ferns.
• So, the correct answer is 'All the above'.