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Coral Reefs thumbnail

Coral Reefs

7th - University grade
Played 1 times
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Preview (20 questions)
1 Question
לפני 10 שניות
Q.

A coral reef is an underwater ecosystem composed of colonies of coral polyps held together by ____________.


Magnesium Carbonate

Calcium Oxide

Calcium Carbonate

2 Question
לפני 10 שניות
Q.

Shallow water corals need sunlight and an optimum temperature range of _________ to grow.


17-25 ºC

20-29 ºC

20-25 ºC

3 Question
לפני 10 שניות
Q.

Corals form a symbiotic relationship with photosynthetic algae called __________, which live in their tissues, these algae give the corals their amazing colors.


Zooxanthellae

Blue-Green Algae

Rhodophyta

4 Question
לפני 10 שניות
Q.

Coral belongs to the animal phylum Cnidaria, which also includes sea anemones and _________. 


Clown Fish

Sea Cucumber

Jellyfish

5 Question
לפני 10 שניות
Q.

Coral reefs are known as __________ of the sea as they compose 25% of marine species of the world.


Grasslands

Rainforests

Evergreen forests

6 Question
לפני 10 שניות
Q.

Corals are not just warm-water creatures, there are also deep-sea corals that live up to depths of _________ and in temperatures as low as 4ºC.


2,000m

1,000m

1,500m

7 Question
לפני 10 שניות
Q.

Deep-sea corals are more fragile and live off the dead as _____________ is not possible . Even with scant food supply some of them can live up to 100 years.


Acidification

Eutrophication

Photosynthesis

8 Question
לפני 10 שניות
Q.

Coral reefs are the largest structures on earth of _________ origin.


Biological

Chemical

Synthetic

9 Question
לפני 10 שניות
Q.

Coral reefs grow at a very slow rate of just two ________ per year.


Centimeters

Millimeters

Meters

10 Question
לפני 10 שניות
Q.

There are three different types of coral reef formations namely barrier reefs, ________, and fringing reefs.


Coral reefs

Coral atolls

Fringing atolls

11 Question
לפני 30 שניות
Q.

The Great Barrier Reef of Australia spans 1600 miles composing over _______ individual reefs and 900 islands and can even be seen from space.


1,900

900 

2,900

12 Question
לפני 10 שניות
Q.

The second-largest coral reef in the world is the Mesoamerican Reef of the ___________ basin, it protects people of Mexican to Central American coast from hurricanes.


Caribbean

Pacific

Aleutian

13 Question
לפני 10 שניות
Q.

Which year was declared as the International Year of the Reef by the U.S. Departments of State and Commerce along with the world nations?


1989

2016

1997

14 Question
לפני 10 שניות
Q.

Scientists have just begun to research the medicinal aspects of the Corals reefs but they are already being used in the treatment of cancer and _______.


HIV

Diabetes

Malaria

15 Question
לפני 10 שניות
Q.

Mother corals or Older Corals do have children called _________ that free-float until they attach themselves to a harder surface.


Pahoehoe

Planulae

Polyps

16 Question
לפני 10 שניות
Q.

Coral Triangle is a collection of islands in the__________ region that homes to at least 500 coral species.


Indo-Pacific 

Atlantic

Arctic

17 Question
לפני 10 שניות
Q.

Corals are under serious threat as a result of rising levels of _________. In the last 30 years, we've lost about 50 percent of global corals.


Ozone

Particulate matter

Carbon dioxide

18 Question
לפני 10 שניות
Q.

_________ is an international non-profit organization focused on coral reef conservation.


WWF

SECORE

Greenpeace international

19 Question
לפני 10 שניות
Q.

Coral reefs also play an important role in environment stability by helping to manage the ____________ levels.


Carbon monoxide

Oxygen

Carbon dioxide

20 Question
לפני 10 שניות
Q.

The most biodiverse region of the world’s oceans is the ___________ of West Papua that nurtures a grand total of 574 coral species.


Apo Reef

New Caledonian Barrier Reef

Bird’s Head Peninsula Coral Reef