Select the underlined group of words to fill in the blank. -Most of the rivers dry up during the summer season, but the Ganga is full of water round the year because it is __________.

Correct Answer: Perennial
Explanation:
Perennial means lasting throughout the year or flowing continuously.
Since the Ganga has water throughout the year, it is called a perennial river.

Perennial = Flows throughout the year (सदानीरा / बारहमासी) ✅
Annual = Occurring once a year (वार्षिक)
Biennial = Occurring once every two years (द्विवार्षिक)
Biannual = Occurring twice a year (वर्ष में दो बार)
Answer: Perennial (Option 3)