Life Science

A student predicts that if marigold flowers are planted around a group of tomato plants, then fewer insects will eat the tomatoes. Which observation would support the prediction?

• a count of 20 insects before marigolds are planted, and 20 insects after marigolds are planted

• a count of 20 insects before marigolds are planted, and 12 insects after marigolds are planted

• a count of 10 tomatoes before marigolds are planted, and 5 tomatoes after marigolds are planted

• a count of 10 tomatoes before marigolds are planted, and 15 tomatoes after marigolds are planted

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Amphibians are able to exchange oxygen and carbon dioxide through their smooth, moist skin. Which of these organs has the same purpose?

• heart

• liver

• lungs

• stomach

Look at the pictures of wetland birds. Which of the following numbers goes with the bird that is NOT well adapted to finding food during high water levels?

• 1

• 2

• 3

• 4

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In the rainforest, plants that live on the forest floor have different adaptations from plants that live high up in the canopy. What is the MAIN reason that the leaves of plants on the forest floor are much wider than those found in other areas of the forest?

• These plants produce poisons that plants in other areas do not.

• These plants need to take in more water than plants in other areas do.

• These plants have less access to light than plants in other areas have.

• These plants have more natural predators than plants in other areas have.

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Which organ in the illustration is the liver?

• W

• X

• Y

• Z

During dry seasons, alligators make deep holes in the wetlands. Why has the alligator adapted to make a hole its home during these seasons?

• to protect eggs in its nest

• to provide a habitat to other animals

• to cool off during the hot temperatures

• to stay warm during the cool temperatures

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In the energy pyramid, which trophic level contains the least amount of energy?

• Producers

• Primary Consumers

• Secondary Consumers

• Tertiary Consumers

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A diagram of an ecosystem is shown below. An insecticide is used to destroy most of the leaf beetles. What will most likely happen?

• The population of large birds will die out completely.

• Leaf beetles will multiply rapidly and provide more food for small birds.

• Small birds will avoid poisoned insects by preying on grass frogs.

• The grasshopper population will have more available food.

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Which of the following is correct about the energy passed between the living things in this food chain?

• Some of the energy is lost as heat.

• Deer give energy to the plants.

• The wolfs get more energy from the deer than the deer get from the plants.

• Energy starts with the plants and is passed to all of the other living things in this environment.

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Look at the picture. Three organisms on the food web have arrows pointing toward them but no arrows pointing away from them. This is because ___

• they make their own food.

• they give energy to others.

• nothing shown eats them.

• they need no energy.

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