What is the illustration above an example of?

A) food chain C) energy pyramid

B) food web D) carbon cycle

Science^ dire < chaprer

Review inking Critically

18. Draw a Conclusion A country has many starving people. Should they grow vegetables and corn to eat, or should they grow corn to feed cattle so they can eat beef? Explain.

19. Explain why a food web is a better model of energy flow than a food chain.

20. Infer Do bacteria need nitrogen? Why or why not?

21. Describe why it is often easier to walk through an old, mature forest of tall trees than through a young forest of small trees.

22. Explain why giant sequoia trees grow on the west side of California's Inyo Mountains and Death Valley, a desert, is on the east side of the mountains.

23. Concept Map Copy and complete this food web using the following information: caterpillars and rabbits eat grasses, raccoons eat rabbits and mice, mice eat grass seeds, and birds eat caterpillars.

Food Web With Kcal

24. Form a Hypothesis For each hectare of land, ecologists found 10,000 kcals of producers, 10,000 kcals of herbivores, and 2,000 kcals of carnivores. Suggest a reason why producer and herbivore levels are equal.

25. Recognize Cause and Effect A lake in Kenya has been taken over by a floating weed. How could you determine if nitrogen fertilizer runoff from farms is causing the problem?

erformance Activities

26. Poster Use magazine photographs to make a visual representation of the water cycle.

Applying Math

27. Energy Budget Raymond Lindeman, from the University of Minnesota, was the first person to calculate the total energy budget of an entire community at Cedar Bog Lake in MN. He found the total amount of energy produced by producers was 1,114 kilocalories per meter squared per year. About 20% of the 1,114 kilocalories were used up during respiration. How many kilocalories were used during respiration?

28. Kilocalorie Use Of the 600 kilocalories of producers available to a caterpillar, the caterpillar consumes about 150 kilocalories. About 25% of the 150 kilocalories is used to maintain its life processes and is lost as heat, while 16% cannot be digested. How many kilocalories are lost as heat? What percentage of the 600 kilocalories is available to the next feeding level?

Use the table below to answer question 29.

Mighty Migrators


Distance (km)

Desert locust



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