Ocean Ecosystems

Question 1

Which statement best describes an ocean ecosystem as a system of living and non‑living parts that interact?

Accepted Answer

An ocean ecosystem includes fish, seaweed, and plankton that get energy from the sun, and it is affected by temperature, salinity, light, and currents, all of which interact with each other.

Answer

An ocean ecosystem is a place where only producers like seaweed live; consumers and decomposers are not needed.

Answer

An ocean ecosystem consists of rocks, sand, and water, but living things like plants and animals are not part of it.

Answer

An ocean ecosystem is only made up of fish and other animals; the water temperature and salinity do not affect them.

Question 2

In a coastal kelp forest, which statement best describes how the living and non‑living parts work together as a single ecosystem?

Accepted Answer

The kelp uses sunlight to make food (producer), fish and sea otters eat the kelp or the fish (consumers), bacteria break down dead kelp (decomposers), and factors like water temperature, salinity, and currents bring nutrients and affect growth, so a change in any one of these parts influences the whole system.

Answer

Only the kelp, fish, and otters exist in the ecosystem; they survive on their own without needing sunlight, temperature, or currents.

Answer

When water temperature rises, only the fish are affected, while the kelp and bacteria continue unchanged, so the ecosystem remains stable.

Answer

Non‑living factors such as temperature and currents control everything; the plants and animals just float around and do not affect each other.

Question 3

When the water in a coral reef becomes warmer than normal, which chain of effects is most likely to happen? A. The coral loses its color, the fish lose their hiding places, and the number of fish that bigger predators eat goes down. B. The coral grows faster, providing more food for herbivorous fish, which then increase the number of small sharks. C. The water becomes clearer, allowing more sunlight for plankton, which raises the number of sea turtles. D. The temperature rise makes the water less salty, causing all fish to move to deeper water immediately.

Accepted Answer

The coral loses its color, the fish lose their hiding places, and the number of fish that bigger predators eat goes down.

Answer

The temperature rise makes the water less salty, causing all fish to move to deeper water immediately.

Answer

The coral grows faster, providing more food for herbivorous fish, which then increase the number of small sharks.

Answer

The water becomes clearer, allowing more sunlight for plankton, which raises the number of sea turtles.

Try three questions

Which statement best describes an ocean ecosystem as a system of living and non‑living parts that interact?

In a coastal kelp forest, which statement best describes how the living and non‑living parts work together as a single ecosystem?

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