(c) All three statements are correct
Cryogenic engines use liquid hydrogen and liquid oxygen as propellants: This is correct. These propellants are stored at extremely low temperatures, hence the term “cryogenic.”
These engines are typically used for the upper stages of launch vehicles due to their high efficiency and specific impulse: This statement is also correct. Cryogenic engines are known for their high performance and are often used in the upper stages of launch vehicles to maximize payload capacity and efficiency.
India successfully tested its first indigenous cryogenic engine, CE-7.5, for the GSLV Mk II: This statement is correct as well. India has developed and tested its own cryogenic engine technology, with the CE-7.5 engine being used in the GSLV Mk II.

(b) Only two statements are correct (1st and 2nd)
India’s Green Steel Taxonomy aims to promote steel production through low-carbon processes, aligning with sustainable industrial practices.
The taxonomy provides guidelines for identifying and recognizing green steel projects, which is part of India’s broader goal of achieving net-zero emissions by 2070.
The Green Steel Taxonomy was introduced by the Ministry of Steel in collaboration with the Ministry of Finance. (3rd statement is incorrect)

(b) Open borders for the free movement of people
The Schengen Area is a group of European countries that have abolished border controls between each other, allowing for the free movement of people within the area. It does not necessarily imply a common currency, unified defense policies, or a shared official language.

(c) Statements 1, 3 and 5 are correct
Endemism is an important dimension why the Western Ghats Sri Lanka and Indo-Burma regions are classified under biodiversity hotspots. Many species endemic to the region are threatened and are not found anywhere else in the world.
To qualify as a biodiversity hotspot, a region must meet two strict criteria:
It must have at least 1,500 vascular plants as endemics — which is to say, it must have a high percentage of plant life found nowhere else on the planet. A hotspot, in other words, is irreplaceable. Hence, statements 1 and 3 are correct.
It must have 30% or less of its original natural vegetation. In other words, it must be threatened. Hence statement 5 is correct.
Around the world, 36 areas qualify as hotspots. They represent just 2.4% of Earth’s land surface, but they support more than half of the world’s plant species as endemics — i.e., species found no place else — and nearly 43% of bird, mammal, reptile and amphibian species as endemics.
Conservation International was a pioneer in defining and promoting the concept of hotspots.
In 1989, just one year after scientist Norman Myers wrote the paper that introduced the hotspots concept, Conservation International adopted the idea of protecting these incredible places as the guiding principle of our investments.

(c) All three statements are correct
Ahom kingdom was established in 1228 in the Brahmaputra valley of Assam, the Ahom kingdom retained its sovereignty for 600 years. The kingdom was founded by Chaolung Sukapha, a 13th century ruler.
The Ahoms ruled the land till the province was annexed to British India in 1826 with the signing of the Treaty of Yandaboo.
The Charaideo Maidams, represents the late medieval (13th-19th century CE) mound burial tradition of the Tai Ahom community in Assam. It enshrines the mortal remains of the members of the Ahom royalty, who used to be buried with their paraphernalia.