Aquatic Ecosystems

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The next slides contain 11 questions that you should answer. You are ALLOWED to use your notes to help you answer the questions.

Please take note that you need the following notes to answer the question.
A. Abiotic Factors - page 52
B. Aquatic Ecosystems - page 53

Each question has an allotted time of 10 minutes. However, try NOT TO consume the whole 10 minutes so you can answer all questions.

Multiple Choice

2. 1. In aquatic ecosystems, plants are a vital part of the food chain. In which aquatic zone will you find plants?

• benthic zone

• limnetic zone

• aphotic zone

• photic zone

Multiple Choice

1. 2. Which of the following is an example of an interaction between a biotic and abiotic factor?

• Sun warming the ocean water

• A sea otter wrapping itself in kelp

• An Orca pushing an ice flow to knock a seal into the water.

• A recreational fisherman hooking a sea turtle

Multiple Choice

4. 3. Complete the statement.

As you go deeper the bodies of water, the temperature _____, the rate of photosynthesis _________ and the light availability _______.

• decreases, increases, decreased

• decreases, decreases, decreases

• increases, increases, decreases

• increases, increases, increases

Multiple Choice

6. 5. Major zones of the ocean are shown below. Which of the following would be found in the intertidal zone?

• fish that require cooler, dim, or dark water

• dolphins that swim in both surface and deep waters

• a coral reef that thrives in shallow water and plentiful sunlight

• shellfish that spend time under the water and also out in the air and sunlight

Multiple Choice

8. 7. Jill made the table below during her research on aquatic zones and living organisms. Based on Jill’s observations, which conclusion could you draw?

• Organisms in the intertidal zone must be able to withstand very cold water.

• There are no producers in the benthic zone that rely on photosynthesis.

• Organisms in the benthic zone must be able to tolerate large amounts of oxygen.

• The warm water and abundant sunlight in the neritic zone limits the plankton population.

Multiple Choice

9. 8. Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean?

• Most sunlight is absorbed before reaching these levels.

• The ocean floor contains many decomposers.

• Water is a limiting factor.

• The temperature in these zones is extremely high.

Multiple Choice

10. 9. The average depth of oceans is about 4400 meters (m). Why do you think most of the marine organisms live on top of the ocean waters about 200 meters?

• The water on the surface is the coldest.

• Marine organisms favor high salinity on the surface of the ocean.

• Marine organisms are consumers and there are plenty producers on the surface.

• Marine organisms prefer low pH on the surface of the ocean.

Multiple Choice

11. 10. Aquatic ecosystems, whether freshwater or marine, are affected by many abiotic factors. The salt marshes found along the coastlines of northern Florida contain many different plants and animals that would not be found in a freshwater marsh. Salt marshes also have different physical conditions than freshwater marshes. Which abiotic factor most determines the kind of marsh ecosystem?

• Salinity of the water

• Temperature of the water

• Dissolved oxygen in the water

• Turbidity of the water

Multiple Select

12. 11. Which marine organisms can you find in Neritic Zone?

• anemones, mussels, barnacles, sea urchins, crabs

• seals, sea urchins, fish, otters

• fish, jellyfish, whales, sharks

• coral reefs, kelps

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