Which of the following is an aquatic fern?

Correct answer: Salvinia

Explanation: Salvinia is an aquatic fern, found floating on water surfaces. 📚 Other Information: ▪️ It belongs to the family Salviniaceae. ▪️ Commonly found in ponds, lakes, and slow-moving water bodies. ▪️ It reproduces vegetatively and by spores. ▪️ Salvinia helps in reducing water evaporation, but excessive growth can choke water bodies. ▪️ Known as a water fern, it is used for biological wastewater treatment. ▪️ Some species act as bioindicators of pollution. ▪️ It can grow rapidly, forming dense mats on water surfaces. ▪️ Also helps in preventing mosquito breeding in stagnant water.