Question

Coral reefs are diverse underwater ecosystems. These are built by colonies of tiny animals found in

marine waters that contain few nutrients. Tens of thousands of marine species live there. These include

about one-third of all marine fish species. Coral reefs not only add incredible value as wildlife habitat, but

also protect coastlines from storms and provide jobs worth billions to people around the world.

2. Corals are ancient animals related to jellyfish. An individual coral is known as a polyp, a. very small and

simple organism. It has a tentacle-bearing mouth. Thousands of identical polyps live together in a coral

colony. Each polyp excretes calcium carbonate and over long periods of time; many coral colonies add up to

the structure of a coral reef. Many other species—fish, invertebrates, algae and microorganisms-make their

homes on and around this reef. Reefs only occur in shallow areas that get sunlight. However, some coral

reefs extend even deeper, up to about 450 feet deep. These reef-building corals are animals that act like

plants. They stay in one place and get some of their energy from the sun. In India, coral reefs are located in

Lakshadweep, the Andaman and Nicobar Islands, the Gulf of Kutch and the Gulf of Marwar.

3. Coral reefs are one of the most sensitive ecosystems, and a large number of reefs are on the brink of

extinction. The major factor for the destruction of coral reefs is global warming due to increased carbon

dioxide in the atmosphere. Studies have shown that even one degree Celsius rise above normal temperature

can result in a large-scale destruction. Besides this, water pollution, destructive fishing practices, oil spills

and tourism activities also play an important part in destroying corals.

4. Coral reefs are of immense value, but their entire presence in the world adds up to less than one per cent

of the sea floor.

Answer the following questions very briefly:



1. What are coral reefs?

2. Coral reefs are built by………………………………..

3. Why are they very rich in marine life?

4. What are polyps?

5. Why do reefs generally exist in shallow areas?

6. How are reef-building corals similar to plants?

7.Why are coral reefs on the verge of extinction?

8.How does water pollution affect coral reefs?

9. Find the synonym of ‘susceptible’ in para 3.

10. Find the antonym of ‘construction’ in para 3.​

Answer 1

Answer:

1. Coral reefs are diverse underwater ecosystems.
2. colonies of tiny animals found in  marine waters that contain few nutrients.
3. Tens of thousands of marine species live there.
4. An individual coral is known as a polyp.
5. Reefs only occur in shallow areas that get sunlight.
6. reef-building corals are animals that act like  plants. They stay in one place and get some of their energy from the sun.
7. The major factor for the destruction of coral reefs is global warming due to increased carbon  dioxide in the atmosphere. Studies have shown that even one degree Celsius rise above normal temperature  can result in a large-scale destruction. Besides this, water pollution, destructive fishing practices, oil spills  and tourism activities also play an important part in destroying corals.
8. water pollution, destructive fishing practices, oil spills  and tourism activities also play an important part in destroying corals.
9. brink
10. destruction

Answer 2

Answer:

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