Q41. Which is the largest sea in the world by area?
a) Coral Sea
b) Philippine Sea
c) Arabian Sea
d) South China Sea
Show Answer
Correct Answer: b) Philippine Sea
Explanation: The Philippine Sea is the largest sea in the world by area, covering approximately 5 million square kilometers. It is part of the western Pacific Ocean and is bordered by the Philippines, Taiwan, Japan, and the Marianas.
Q42. Which country has the largest number of river islands in the world?
a) Brazil
b) India
c) Bangladesh
d) China
Show Answer
Correct Answer: a) Brazil
Explanation: Brazil has the largest number of river islands in the world, many of which are located within the Amazon River system. These islands contribute to the region’s ecological diversity and complexity.
Q43. What is the largest estuary in the world by area?
a) Chesapeake Bay
b) Rio de la Plata
c) Gulf of Saint Lawrence
d) Hudson Bay
Show Answer
Correct Answer: d) Hudson Bay
Explanation: Hudson Bay is the largest estuary in the world by area. It is a massive body of saltwater mixed with freshwater from rivers and streams, covering over 1.23 million square kilometres.
Q44. Which ocean is the least salty?
a) Atlantic Ocean
b) Pacific Ocean
c) Indian Ocean
d) Arctic Ocean
Show Answer
Correct Answer: d) Arctic Ocean
Explanation: The Arctic Ocean is the least salty of the world’s oceans. Its lower salinity is due to the large amounts of fresh water that enter the ocean from rivers and melting ice.
Q45. Which country has the largest number of coastal sand dunes?
a) United States
b) Brazil
c) Australia
d) South Africa
Show Answer
Correct Answer: c) Australia
Explanation: Australia has the largest number of coastal sand dunes, which are a prominent feature of the country’s extensive coastline. These dunes are formed by the action of wind and waves and are important ecological and geological structures.
Q46. Which is the largest delta in the world?
a) Mississippi River Delta
b) Ganges-Brahmaputra Delta
c) Nile Delta
d) Mekong Delta
Show Answer
Correct Answer: b) Ganges-Brahmaputra Delta
Explanation: The Ganges-Brahmaputra Delta is the largest delta in the world, located in Bangladesh and India. It is formed by the confluence of the Ganges, Brahmaputra, and Meghna rivers and covers an area of about 105,000 square kilometres.
Q47. Which sea is known for its high biological productivity and is a major fishing ground?
a) North Sea
b) Bering Sea
c) Sea of Okhotsk
d) Adriatic Sea
Show Answer
Correct Answer: b) Bering Sea
Explanation: The Bering Sea is known for its high biological productivity and is one of the world’s major fishing grounds. It supports large populations of marine mammals, seabirds, fish, and invertebrates.
Q48. Which country has the largest number of salt lakes?
a) China
b) United States
c) Australia
d) Russia
Show Answer
Correct Answer: c) Australia
Explanation: Australia has the largest number of salt lakes, many of which are found in the arid and semi-arid regions of the continent. These lakes are often ephemeral, filling with water only during periods of significant rainfall.
Q49. Which is the largest enclosed body of water in the world by volume?
a) Black Sea
b) Caspian Sea
c) Lake Superior
d) Lake Baikal
Show Answer
Correct Answer: b) Caspian Sea
Explanation: The Caspian Sea is the largest enclosed body of water in the world by volume, containing approximately 78,200 cubic kilometres of water. It is classified as the world’s largest lake or a full-fledged sea.
Q50. Which country has the most extensive seagrass beds in the world?
a) Indonesia
b) Australia
c) Mexico
d) Egypt
Show Answer
Correct Answer: b) Australia
Explanation: Australia has the most extensive seagrass beds in the world, with significant areas found in places like Shark Bay and the Great Barrier Reef. Seagrass beds are important for carbon sequestration and as habitats for marine life.