Life Science CRCT Practice Carver Elementary 4 th Grade

1. What is the role of a producer in a food web? A. To produce water B. To produce food C. To eat other organisms D. To decompose the bodies of dead animals

Use the diagram to answer question According to this food web, what are two sources of energy for the fox? A. Grass and hawkB.mouse and rabbit C. Tree and owlD. Mouse and grasshopper

4. Water hyacinth is a floating plant that reproduces quickly. If left alone, this plant can take over a pond, blocking out most of the sunlight. What is most likely to happen as a result of the growth of the water hyacinth? A. Other plants will grow taller B. Animals reproduce more quickly C. Diversity increases D. Diversity decreases

5. Decomposers are helpful in a food chain because A. They produce food from sunlight, water, and carbon dioxide gas. B. They eat other animals, keeping the populations of consumers down. C. They break down the remains of other organisms and add nutrients to the soil. D. They produce oxygen for other organisms to breathe.

6. What is name for consumers that are eaten? A. Carnivores B. Fossils C. Predators D. prey 7. Which of the following animals is a herbivore? A. Grizzly bear B. Cow C. Hawk D. Lion

Use the passage below to answer question 8. It prefers wetland sites such as rivers, streams, and marshes. In the wild, it makes its den in a hollow tree or a crevice in rock ledges. If its environment changes, it can adapt. It may move to a human-made structure such as a barn, an attic, or an abandoned building. 8. The passage above is describing an animal’s A. HabitatB. Niche C. PopulationD. Type of reproduction

9. Which population would increase if the number of mice increased? A. GrasshoppersB. Hawks C. GrassD. Rabbit

10. Which sequence correctly shows how energy flows among these four organisms? A. grass → rabbit → fox → hawk B. grass → fox → rabbit → hawk C. hawk → grass → rabbit → fox D. Fox → hawk → grass → rabbit

12. If the size of the fish population decreased, how would the population of the penguins be affected? A. It would increase slightly B. It would increase a lot C. It would decrease D. It would stay the same Killer Whale Seal Penguin Fish Squid

Use the picture to answer question Aphids are eating the rose buds. A ladybug beetle is eating the aphids. Which term describes the aphids? A. Predator B. First-level consumer C. Producer D. Second-level consumer

14. The gypsy moth was brought to the U.S. in the 1860s. It feeds on aspen and oak trees. It causes damage and death in forests where it is found. What is this an example of? A. Temperature changing an environment B. A nonnative organism harming an ecosystem C. Climate changing a population D. Humans protecting an endangered organism

17. What would FIRST happen to this ecosystem if the terrarium was placed in a dark room? A. The plants would grow faster B. The plants would begin to die. C. The ants would move faster D. The ants would begin to die.

18. As you move up the levels of an energy pyramid, the number of living things decreases. Why? A. The amount of sunlight decreases. B. There is not enough water in the environment for a large number of living things. C. There is not enough air in the environment for a large number of living things. D. The amount of energy available to living things decreases.

Use the diagram below to answer question Which term BEST describes this diagram? A. Food chainB. Food web C. population pyramidD. Energy pyramid