Question

Which of the following plants is used for the purification of water?
A. Biggiata
B. Chlorella
C. Spirogyra
D. Eichhornia

Answer 1

Hint:- Water purification is a chemical, biological and physical process by which harmful chemicals, substrates and microbes are removed from it, this process makes it fresh and drinking water that is good for health and metabolism.

Complete step-by-step solution:-
No plant species exists named Biggiata.
Chlorella is a genus of green – algae member of chlorophyta division, it is a single cell algae and also known as a super food due to its impressive nutritional composition. But its nutritional content depends on growing conditions, the species used, and what supplements are processed, it’s clear it packs several beneficial nutrients.
Spirogyra is filamentous green - algae belong to Zygnematales order. It is named spirogyra due to its helical or spiral arrangement. It is very useful for humankind and is known as an important natural bioactive source compound for antibiotic, antiviral, antioxidant, anti-inflammatory, and cytotoxic purposes.
Eichhornia is also known as water hyacinths, it is a polyphyletic genus of the aquatic angiosperm plants family called Pontederiaceae. A recent study has shown that water hyacinth or Eichhornia was used to treat domestic wastewater or water purification. To check its ability ten organic and inorganic parameters were observed in three weeks for water purification including six chemicals, biological and physical parameters.
As per the above discussion the correct answer of these questions D, Eichhornia, and I hope you guys will make sure why other options are incorrect.

Note:- Apart from Eichhornia, Azolla, Lemna, Salvinia, and some other species have the ability to purify the environment because they can permit, uptake, and even accumulate heavy metals and other toxicants in their cells.