1. 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
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Answer: Coral reefs are built by and made up of thousands of tiny animals – coral “polyps”.
Polyps are shallow-water tiny organisms related to anemones and jellyfish, and they are responsible for building and forming coral reefs. They have a soft body covered by a hard calcareous skeleton.
2. In which among the following places in India are coral reefs present?
- Andaman and Nicobar
- Lakshadweep
- Palk Bay
- Gulf of Mannar
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Answer: Lakshadweep
Coral reefs are present in Andaman and Nicobar, Lakshadweep, Palk Bay, Gulf of Mannar, and Gulf of Kutch. Among these, Lakshadweep is an example of an atoll, while the others are fringing reefs.
3. 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
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Answer: Atolls
Atolls are the reefs that are situated away from the deep sea platforms and are found around an island or on a submarine platform in an elliptical form.
4. What is a reef that is roughly circular and surrounds a large central lagoon?
- Atoll
- Barrier Reef
- Fringing Reef
- None of the above
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Answer: Atoll
An atoll is a reef that is roughly circular and surrounds a large central lagoon.
5. Which reefs are considered the largest, highest, and widest?
- Barrier Reefs
- Atolls
- Fringing Reefs
- All of the above
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Answer: Barrier Reefs
Barrier Reefs are the largest, highest, and widest reefs among the three types of coral reefs.
Option B is also correct. The aphotic zone is the portion of the ocean where sunlight does not penetrate, and it extends from around 200 meters depth to the ocean floor.
6. 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
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Answer: Fringing Reef
Fringing Reefs are the type of corals found very close to the land and form a shallow lagoon known as Boat Channel.
7. 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
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Answer: Shallow water having a depth less than 50 m.
The correct conditions for the formation of Coral Reefs are that the temperature of the water should not be below 20°C, and they grow better in shallow water with a depth less than 50 m.
8. 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 A and C
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Answer: Both A and C
The first and third statements are correct. Coral reefs are colonies of tiny living creatures found in oceans, and they are commonly known as the rainforests of the sea. However, the second statement is incorrect as they cover only 0.1% of the ocean’s surface.
9. Which among the following are called Rainforests of the Ocean?
- Zooplanktons
- Corals
- Phytoplanktons
- Algae
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Answer: Corals
Corals reefs are commonly known as the rainforests of the oceans. They are diverse habitats that house 25% of marine species, even though they cover only 0.1% of the ocean’s surface.
10. Which is the largest coral reef in the world?
- Kingman Reef
- The Great Barrier Reef
- Lansdowne Bank
- Lyra Reef
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Answer: The Great Barrier Reef
The Great Barrier Reef is the largest coral reef system in the world, located off the coast of Queensland, Australia. It consists of over 2900 individual reefs and 900 islands.
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