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100
  • Which of the following is an example of a biotic component?
  • Sunlight             b- water        c- soil          d- plants

plants 

100
  • What percentage of the Earth's surface is covered by aquatic ecosystems?
  • 50%          b- 60%            c- 71%           d- 80%

71%

100
  • Which of the following is an example of a freshwater habitat?
  • Ocean        b- lake        c- sea       d- coral reef

lake 

200
  • Which of the following is NOT a type of land ecosystem?
  • Forest         b- ocean       c- mountain      d- desert

ocean 

200

Abiotic factors do not affect living organisms

(true or false )

false 

200
  • What percentage of the Earth's surface is covered by land ecosystems?
  • 29%          b- 71%      c- 50%         d- 40%

29%

300

What are the two main types of aquatic ecosystems

salinity system and freshwater system 

300
  • What percentage of the Earth's surface is covered by salinity systems?
  • 50%       b- 60%          c- 70%        d- 80%

70%

300
  • A population is a group of organisms of different species. 
  • (true or false )

false 

400
  • What is the difference between biotic and abiotic factors?

Biotic factors are the living components of an ecosystem , Abiotic factors are the non-living components of an ecosystem

400

A community includes all the living organisms in an ecosystem

(true or false)

true 

400
  • What is the main characteristic of a salinity system?
  • Low salt content     b- high salt content      c- no salt content      d- variable salt content

high salt content