Chapter 6
Life in the Baltic Sea

Find the correct answer for each question.

1. Littoral

   1.   ?    Coastal ecosystem
   2.   ?    Bottom ecosystem
   3.   ?    Open sea ecosystem

2. Benthic

   1.   ?    Bottom ecosystem
   2.   ?    Deep water ecosystem
   3.   ?    Marine water ecosystem

3. Pelagic

   1.   ?    Open sea ecosystem
   2.   ?    Deep water ecosystem
   3.   ?    Coastal ecosystem

4. Invertebrates are

   1.   ?    Animals without backbones
   2.   ?    Sea mammals
   3.   ?    Fishes

5. Fucus

   1.   ?    Is a genus of brown algae
   2.   ?    Is a crystation
   3.   ?    Is a invasive fish

6. Mytilus edulis is the scientific name for a

   1.   ?    Blue-green algae
   2.   ?    Filamentous algae
   3.   ?    Mussel

7. Macoma baltica is a:

   1.   ?    Small mussel common in the Baltic Sea
   2.   ?    A small fish common in the Baltic Sea
   3.   ?    An endemic plant in the Baltic Sea basin

8. Bladderwrack

   1.   ?    Is a small bottom-living animal
   2.   ?    Is a brown algae
   3.   ?    is an instrument measuring precipitation at sea

9. Blue mussels is a large part of the total biomass of the Baltic Sea. In percent they constitute

   1.   ?    45%
   2.   ?    36%
   3.   ?    90%

10. The dominating fish species in the Baltic Sea is

    1.   ?    Cod
    2.   ?    Salmon
    3.   ?    Herring

11. An adult grey seal eat a lot of fish. Every day it eats about

    1.   ?    2 kg
    2.   ?    30 kg
    3.   ?    7 kg

12. Vertebrates are

    1.   ?    bacteria, for example dinoflagelates
    2.   ?    animals with backbones
    3.   ?    carnivarous fishes that eat other smaller fishes

13. Cryptogams are

    1.   ?    Another word for brown-green algae.
    2.   ?    Plants that do not have flowers.
    3.   ?    Plants receiving all energy from the sun.

14. Oligotrophic is a term describing

    1.   ?    Waters rich in nutrients
    2.   ?    Waters with too much oxygen content
    3.   ?    Waters with very little nutrients

15. The Baltic Sea is special since it

    1.   ?    Is an extremely deep epicontinental sea with high biodiversity
    2.   ?    Has a low biodiversity but a large biomass
    3.   ?    Has high biodiversity and also animals in general are bigger in size than in marine waters.