Unit 12 Interdependence Among Living Systems

Phytoplankton can grow excessively in the water when...

• Chemical herbicides are sprayed by people

• People drill for oil

• People use chemical fertilizers that run off into rivers

• People pollute the water

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Dead zones in the ocean are places where organic material is decomposing, using up all the oxygen. Which of these activities will be most affected by one of these zones?

• Drilling for oil because the water is polluted

• Sand mining, because the sand won't be on the beach

• Commercial shipping, because there are too many boats in the water

• Commercial fishing, because there won't be enough oxygen in the water for the fish

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In the rainforest, trees grow narrow and tall and very quickly. Why is this?

• They don't want to be fat

• They are competing for sunlight so they get to it as quickly as they can

• They don't like the forest floor

• There is no water near the roots.

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Which is an example of biotic and abiotic factors interacting together in an ecosystem?

• Bear eating a fish
• Rabbit eating grass
• A dog digging in the dirt

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What is another word for something that is ALIVE or was ONCE LIVING

• Biotic

• Abiotic

What is another word for something that was NEVER ALIVE?

• Biotic

• Abiotc

If the acidity in the oceans keep increasing every year, which poses a greater threat to the ocean life?

• coral reefs - the acid eats away at the calcium carbonate that makes up the reef.

• algae - the acid makes it easier for the algae to grow.

• sea turtles - the acid strengthens their shells.

• kelp - the acid strengthens their ability to keep their roots attached.

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People depend on the oceans for __________________.

• Natural resources

• Food and water

• Transportation

• All of the above.

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How do the oceans contribute to the amount of Oxygen in the Earth's atmosphere?

• Fish in the ocean produce oxygen.

• Phytoplankton in the ocean produce oxygen through the process of respiration.

• Phytoplankton in the ocean produce oxygen through the process of phtosynthesis.

• There is no oxygen production in the ocean.

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What is a fertilizer runoff?

• When fertilizer runs into a body of water.

• When water makes fertilizer.

• When algae grows rapidly.

• The industrial production of fertilizers.

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