1. Jet stream blow across Asian Continent at latitudes North of Himalaya parallel to Tibetan highlands.
2. Tibetan highland divides jet stream into North and South Branches.
3. The northern branch of jet stream plays important role in winter weather in India.
Correct Answer: (a) 1 and 2
Solution:During the winter a distinet pattern of air circulation is observed higher up in the atmosphere. Significanly westerly winds continue to affect western and central Asia extending approx of 9 to 13 km from west to east. At latitudes north of the Himalayas and almost parallel to the Tibetan highlands, there winds blow across the Asia continent. Thus the first statement is true.
Notably, these jet streams are obstructed by the hills of Tibet consequently, jet stream split in two. One of its branches flows north of the Tibetan highlands and the other, which originates south of the Himalayas, blows eastward before merging again to form a single stream over China, Hence statement 2 is correct.
Notably, the northern branch of jet stream does not play an important role in winter weather in India. So statement (3) is false.