Question

Which of the following is used as 'Organic Manure'?
1. Urea
2. Potassium
3. Azolla
4. Neem

Answer 1

Correct Answer - Option 3 : Azolla

The Correct Answer is Azolla.

• An Azolla is a genus of seven species of aquatic ferns in the family Salviniaceae. 
• They are extremely reduced in form and specialized, looking nothing like other typical ferns but more resembling duckweed or some mosses. 

• Urea, also known as carbamide, is an organic compound with chemical formula CO(NH₂)₂.
• Potassium is a chemical element with the symbol K and atomic number 19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force.
• Azadirachta indica, commonly known as neem, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae. It is one of two species in the genus Azadirachta, and is native to the Indian subcontinent. It is typically grown in tropical and semi-tropical regions.