Mod 5 Review Marine Science

Which is an abiotic component of a marine ecosystem?

• Coral in a coral reef

• Detritus on the bottom of the ocean

• Fish in the water column

• Sand on the ocean floor

Which is a biotic component of a marine ecosystem?

• Detritus on the ocean floor

• The oxygen concentration of the water

• Rocks on the ocean floor

• The temperature of the water

Which of the following is an abiotic factor that is having a negative impact on marine populations?

• Loss of seagrass beds

• Predation by invasive species

• The presence of algae blooms

• The lack of oxygen in coastal waters

Which of the following is a biotic factor that is having a negative impact on marine populations?

• Attraction to artificial lighting

• Predation by invasive species

• The presence of marine debris

• The process of shoreline erosion

How do wetlands abiotically help to protect the water quality of a marine ecosystem?

• They cause areas to flood into larger water bodies.

• They cause the water to be filled with tannins.

• They filter sediments and other material from runoff.

• They prevent water from being stored in their areas.

The interaction between seagrass and its environment impacts its distribution and abundance. What do you predict are three abiotic causes of declines in seagrass communities?

• Aquaculture development, predation, and overfishing

• Climate change, reduced plant reproduction, and increasing severity of tropical storms

• Industrial and agricultural runoff, coastal infrastructure development, and dredging

• Overpopulation of sea turtles, urchins, and crabs

What do you predict would best aid in the recovery of offshore, environmentally deteriorated seagrass communities?

• Aquaculture development

• Coastal development regulations

• Fishing regulations

• Sea turtle population recovery

Which of the following organisms are important producers for marine food chains?

• Phytoplankton

• Killer whales

• Krill

• Zooplankton

Which organisms are top consumers in a marine food chain?

• Phytoplankton

• Killer whales

• Bacteria

• Tuna

Which trophic level of a marine food chain breaks down organisms from all of the other levels?

• Decomposers

• Herbivores

• Primary producers

• Tertiary consumers