Figure 3.15 Generalized pyramid of energy flow showing the decrease in usable chemical energy available at each succeeding trophic level in a food chain or food web.
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Use the accompanying figure to answer the following five questions.
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Letter D, at the base of the pyramid given above, represents what group of organisms?
What will be an ideal response?
The trophic layer at the bottom of the pyramid representsproducers or plants.
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Which property gives water an unusually high surface tension resulting in a surface "skin" capable of supporting small objects?
A) ?wetting B) ?adhesion C) ?high heat capacity D) ?cohesion
You want to maintain a healthy pond at your school site. Last year another pond became eutrophic; to avoid that, you want to ________
A) provide nitrogen for good nutrient mixing in the benthic zone B) increase the ozone in the littoral zone C) avoid increasing phosphorus runoff into the limnetic zone D) decrease the calcium available in the profundal zone E) increase the carbon-based fertilizers in the littoral zone
Which of the following is a micronutrient, which without sufficient quantities in a diet can result in goiter?
a. Protein b. Carbohydrates c. vitamin A d. vitamin C e. Iodine
This is the most abundant gas in the atmosphere:
A) nitrogen. B) oxygen. C) carbon dioxide. D) water vapor.