5th Grade NC Life Science Review

Which best describes a difference between estuaries and ponds?

• Ponds flow into the ocean and estuaries do not.

• Ponds are affected by tides and estuaries are not.

• Ponds are freshwater and estuaries are brackish water.

• Ponds have salt water and estuaries have brackish water.

Answer explanation

Ponds are freshwater and estuaries are brackish water, highlighting the correct choice.

Which characteristic would allow many fish to move from ocean to estuary?

• Both ecosystems contain only freshwater.

• Both ecosystems contain sufficient amounts of salt.

• They are both very deep and have cold temperatures.

• Both ecosystems have very little plant life because light cannot reach deep areas.

Answer explanation

The correct characteristic that would allow many fish to move from ocean to estuary is that both ecosystems contain sufficient amounts of salt, enabling fish to adapt to the changing salinity levels.

How are oceans and salt marshes different?

• Salt marshes have deeper water than oceans.

• Salt marshes have shallower water than oceans.

• Salt marshes have more organisms than oceans.

• Salt marshes have more wave action than oceans.

Answer explanation

Salt marshes have shallower water than oceans, making them different in terms of water depth.

Which area is most likely closest to a salt marsh or an estuary?

• a lake

• a prairie

• a coastline

• the mountains

Answer explanation

A coastline is most likely closest to a salt marsh or an estuary due to its proximity to the ocean, where these ecosystems are commonly found.

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Which characteristic differs the most between a forest and a grassland ecosystem?

• the amount of salt

• the amount of trees

• the amount of sunlight

• the amount of organisms

Answer explanation

The characteristic that differs the most between a forest and a grassland ecosystem is the amount of trees. Forests have a higher density of trees compared to grasslands.

A food chain is shown below. Which organisms are consumers?

• scorpion and bacteria

• grass and grasshopper

• grasshopper, scorpion, and kit fox

• grasshopper, scorpion, and bacteria

Answer explanation

Consumers are organisms that eat other organisms. In the given food chain, the grasshopper eats grass, the scorpion eats the grasshopper, and the kit fox eats the scorpion, making them all consumers.

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A biologist observed a zebra, a gazelle, and a prairie dog on an African grassland. Which term best describes the animals the biologist saw in the terrestrial ecosystem?

• carnivores

• consumers

• decomposers

• producers

Answer explanation

The term 'consumers' best describes the animals observed in the terrestrial ecosystem because they are organisms that obtain energy by consuming other organisms.

How are bacteria classified in a forest ecosystem?

• as consumers

• as decomposers

• as herbivores

• as producers

Answer explanation

Bacteria are classified as decomposers in a forest ecosystem because they break down organic matter, playing a crucial role in nutrient recycling.

Which will most likely cause a decrease in predator populations?

• an increase in prey populations

• a decrease in prey populations

• a decrease in decomposers

• an increase in producers

Answer explanation

A decrease in prey populations will most likely cause a decrease in predator populations as they rely on prey for food.

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Which is most responsible for recycling dead plants and animals in an ecosystem?

• water

• bacteria

• fish

• insects

Answer explanation

Bacteria are most responsible for recycling dead plants and animals in an ecosystem by breaking down organic matter into simpler substances.

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