1. What is a reef that is roughly circular and surrounds a large central lagoon?
- Atoll
- Barrier Reef
- Fringing Reef
- None of the above
Answer: Atoll
2. Which among the following are called Rainforests of the Ocean?
- Zooplanktons
- Corals
- Phytoplanktons
- Algae
Answer: Corals
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3. What percent of ocean surface is covered by coral reefs?
- 0.1%
- 1%
- 10%
- 0.01%
Answer: 0.1%
4. Which among the following statements is/are correct about Coral Reefs?
- They are the colonies of tiny living creatures that are found in oceans.
- They occupy 50% of the ocean surface.
- Coral reefs are also regarded as the tropical rainforest of the sea.
- Both 1 and 3
Answer: Both 1 and 3
5. Which reefs are considered the largest, highest, and widest?
- Barrier Reefs
- Atolls
- Fringing Reefs
- All of the above
Answer: Barrier Reefs
6. Which is the largest coral reef in the world?
- Kingman Reef
- The Great Barrier Reef
- Lansdowne Bank
- Lyra Reef
Answer: The Great Barrier Reef
7. Which of the following statements is/are correct about Coral reefs?
1. Coral reefs are diverse underwater ecosystems held together by Calcium iodide.
2. Reefs grow best in cold, shallow, clear, sunny and agitated waters.
- Only 1
- Only 2
- Both
- None
Answer: None
8. In which among the following places in India are coral reefs present?
- Andaman and Nicobar
- Lakshadweep
- Palk Bay
- Gulf of Mannar
Answer: Lakshadweep
9. Which reefs are situated away from the deep sea platforms and are found around an island or on a submarine platform in an elliptical form?
- Barrier Reef
- Fringing Reef
- Atolls
- All of the above
Answer: Atolls
10. For the first time the indigenously-developed Remotely Operated Vehicle (PROVe) is used for
- Mapping the coral reefs in Andaman & Nicobar Islands
- Mapping the Indian Ocean Floor
- Charting course in the Himalayas
- Work in inaccessible areas for logistics and surveillance
Answer: Mapping the coral reefs in Andaman & Nicobar Islands
11. What type of corals are found very close to the land and form a shallow lagoon known as Boat Channel?
- Atoll
- Barrier Reef
- Fringing Reef
- None
Answer: Fringing Reef
12. Corals mostly thrive in clear, sunlit, salt water. Recently a coral reef system was found at
- Krishna Godavari Delta
- Mouth of Amazon River
- Near Andaman and Nicobar Islands
- In midst of the Nile river
Answer: Mouth of Amazon River
13. Which among the following statements is/are correct about Polyps?
- Coral reefs are built by and made up of thousands of tiny animals – coral “polyps”.
- They are deep water organisms which have a soft body covered by a calcareous skeleton.
- Both A and B
- Neither A nor B
Answer: Coral reefs are built by and made up of thousands of tiny animals – coral “polyps”.
14. Which among the following is/are conditions for the formation of Coral Reefs?
- The temperature of the water should be below 20°C.
- Shallow water having a depth less than 50 m.
- Both A and B
- Neither A nor B
Answer: Shallow water having a depth less than 50 m.
15. Which of the following statements is/are correct about Coral reefs?
1. Coral reefs are rare along the west coasts of the Americas and Africa.
2. Corals are seldom found along the coastline of South Asia
- Only 1
- Only 2
- Both
- None
Answer: Both
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