1.A structure formed by coral polyps is known as;

a. polyp colony      

b.coral reef      

c.polyp cluster     

d.none of them

 

2.Reefs are colonies of coral polyps held together by;

a.calcium sulphate    

b.calcium oxalate  

c. phosphoric acid    

d.calcium carbonate

 

3. A coral reef is an —————ecosystem;

a.estuarine    

b.underwater       

c.none      

d. both of them

 

4.Corals are marine ——————

a.invertebrates        

b.vertebrates         

c.plants    

d.none of them

 

5.Because of diversity of life coral reefs are also knows as;

a.marine kings    

b.rainforests of sea    

c.dominant marine animal   

d.both b and c

 

6.Coral reefs occupy only——— percent area of ocean;

a.5        

b.0.2          

c.0.4         

d.0.1

 

7.Coral reef supports———% of all marine species on planet;

a.20%       

b.25%    

c.10%     

d.55%

 

8.What do polyps eat?

a.plankton       

b.fish     

c.crustacean    

d.sea weed

 

9.Where would you not expect to find coral reef?

a.near coast       

 b.at north pole       

c.near equator      

d.all of above

 

10.The great barrier reef is located in——–

a.Austrailia       

b.Cuba      

c.Mexico     

d.Japan

 

11.What give corals their colour?

a.zooxanthelle      

b.cnidocytes       

c.nematocysts     

d. gastodermis

 

12.Where  are coral reefs located?

a.tropics     

b.subtropics    

c.mid latitudes   

d.both a and b

 

13.What is the name of symbiotic organism that live inside a coral?

a.zooxanthellae   

b.cnidocytes     

c.nematocysts   

d.gorgonia

 

14.How fast do most corals grow per year?

a.2-4inches   

b.6-8inches  

c.1inch     

d.8-10inch

15.How do coral reefs reproduce?

a.s exually   

b. asexually     

c. both       

d. did not reproduce