Explanation:

Only statement 1st is correct.

• In ground-breaking research, a well-known wildlife biologist from Agumbe has proved that king cobra (Ophiophagus hannah) the longest venomous snake in the world, has four different species.

• It is the world’s largest venomous snake and an active hunter.

• The main feature that distinguishes the king cobra from other cobras is the possession of 11 large scales on the crown of its head.

• It preys almost exclusively on other snakes, prowling in forests, fields, and villages in the daytime as well as at night. 

• It was in 1836 that a broad spectrum of king cobra species was named Ophiophagus hannah by Danish naturalist, Theodore Edward Cantor.

• The amount of venom that they can deliver in a single bite is enough to kill 10 people or even an elephant.

• The neurotoxin venom of King Cobra affects the respiratory centres, causing respiratory arrest and cardiac failure.

• The king cobras are the only snakes in the world to build nests that are 4 ftx 3 ft and the female king cobras are found ferociously guarding them. 

The study identified four species of king cobra:

1. Ophiophagus kaalinga: Found in the Western Ghats of southwestern India, this species has fewer than 40 bands on its body.

2. Ophiophagus hannah: Inhabiting northern and eastern India, the Andaman Islands, eastern Pakistan, Indo-Burma, Indo-China, and Thailand, this species displays 50 to 70 bands.

3. Ophiophagus bungarus: Found in the Malay Peninsula, Greater Sunda Islands, and parts of southern Philippines, it features more than 70 bands.

4. Ophiophagus salvatana: Native to Luzon in the northern Philippines, this species lacks bands altogether.

Conservation status

• IUCN: Vulnerable

• CITES: Appendix II

Hence option 1st is correct.