Matter and Energy Flow

• The mass of the dry soil was greater than the tree after it grew.

• After the willow tree grew, the soil lost 0.1 kg of mass.

• The willow gained mass, but the soil lost almost no mass.

• The amount of mass the willow tree gained during the five years was 74.4 kg.

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• Squirrel, robin, and field mouse.

• Squirrel, deer, and mountain lion.

• Prairie grass, deer, and mountain lion.

• Plant seeds, field mouse, and snake.

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Plants get the food they use for energy and growth by

• making it from the sunlight.

• absorbing it from the soil.

• eating small insects.

• breaking down bacteria.

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The process by which plants make food requires water, carbon dioxide and which of the following?

• Nutrients from the soil.

• Energy from the sun.

• Dead and decaying animals.

• Minerals found in rocks.

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Animals get the energy hey need from growth and repair from

• the action of muscles.

• protective coloration.

• the food they eat.

• avoiding predators.

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As a plant grows, it gains mass. Which of the following provides the most matter that a plant uses for its growth?

• Gases in the air.

• Minerals in the soil.

• Salt in the water.

• Chemicals in fertilizers.

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The food of almost any type of organism can be traced to

• the sun.

• the ocean.

• bacteria.

• plants.

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Which of the following best explains the primary role of decomposers in ecosystems? Decomposers

• break down dead organisms and recycle materials.

• provide an important source of food for many animals.

• change matter that is not food into matter that is food.

• extract water from soil and release it into the atmosphere.

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• To break down waste products made by insect larvae.

• To provide energy for the bass and snapper turtles.

• To take in light from the sun and produce food.

• To consume the algae and other pond plants.

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