5th grade Life Science Review

Which of the following describes a relationship in which one organism depends on another for its needs?

• A rabbit burrowing in the ground
• A hawk catching and eating a mouse
• A frog cooling off in a pond
• An oak tree absorbing sunlight for food

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Which of the following is an example of an organism meeting its needs in an ecosystem?

• A bear finding a cave in which to hibernate
• Lion cubs playing with each other
• An animal being tagged by a scientist for tracking
• A bird in a laboratory examined by a scientist

Plants need carbon dioxide from the air in order to grow.  Which of the following best explains how the carbon dioxide gets into the air? Carbon dioxide is - 

• released when ice melts to liquid water
• carried by rainfall to the ground
• stored in the roots of plants
• released by animals when they breathe

A robin's basic needs are as follows: food (earthworms, small insects), shelter (trees in which to build nests), water, and space (area in which to fly). Which environmental change would be harmful to the survival of a robin?

• Prairie dogs digging tunnels under the ground
• Beavers building a dam to create a pond
• Ants building large anthills in a schoolyard
• Humans clearing forests to build houses

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Which of the following are an example of a predator-prey relationship?

• two deer
• sheep and a cow
• otter and a fish
• baby and mom giraffe

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When an earthworm feeds upon the remains of a dead raccoon, it is acting as a .....

• producer
• consumer
• decomposer
• parasite

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The ultimate source of energy for almost all living organisms is

• animals
• plants
• the Sun
• bacteria

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A decomposer is an organism that gets its energy from

• living organisms
• the prey it hunts and kills
• dead plant and animal matter
• the food it produces during photosynthesis

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In this diagram, what is the producer?

• sea lamprey
• trout
• phytoplankton
• plankton-eating fish

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Photosynthesis happens in the leaves of a tree when the Sun shines.  Which gas must be present in the air for this process to occur?

• oxygen
• carbon dioxide
• hydrogen
• nitrogen

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