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The Rowmari–Donduwa Wetland Complex, proposed as a Ramsar site, is located within which of the following protected areas?

The Laokhowa and Burhachapori Wildlife Sanctuaries are ecologically significant because —

Consider the following statements about Water Lettuce (Pistia stratiotes).

1. It is a free-floating aquatic weed found mainly in tropical regions across Asia, Africa, and equatorial America.
2. It is considered an invasive species because it forms dense mats that obstruct waterways and degrade water quality.
3. The mats formed by water lettuce increase dissolved oxygen levels, supporting higher aquatic biodiversity.

Which of the statements given above is/are correct?

How many of the following are classified as rare earth elements?

1. Scandium
2. Yttrium
3. Cerium
4. Tungsten
5. Neodymium
6.  Gadolinium