ECOSYSTEMS TEST 2018-2019

Which of the following is NOT a biotic factor?

• Walrus
• Squid
• Salinity
• Algae

Which of the following is the process of pulling CO2 form the atmosphere to make food?

• Photosynthesis
• Cellular Respiration
• Decomposition
• Nitrification

When plants and animals die their bodies _______ and carbon atoms are returned to the atmosphere.

• Cellular Respiration
• Decomposition
• Nitrification
• Photosynthesis

Mangrove swamps are named after the type of ____________ found in them that is salt tolerant.

• flowers
• grasses
• trees

Salinity means the level of _______________in the water. 

• oxygen
• salt
• nitrogen

Brackish means that the water is

• only salt water
• a mix of fresh and salt water
• only fresh water

How many trophic levels are there in the food chain?

• 1

• 3

• 6

• 9

Which of the following is a 1st level carnivore?

• zooplankton

• crustaceans

• sharks

• seaweed

Since fish live underwater, they do not require oxygen.

• True
• False

Ecology is.......

• Organisms and their environment
• Medical research
• Electricity
• Astronomy