20. A simple food chain is shown below. The primary consumer in this food chain
ID: 121563 • Letter: 2
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20. A simple food chain is shown below. The primary consumer in this food chain is the: Orca Sea otter Sea Urchin Kelp (seaweed) A. Orca B. Sea Otter C. Sea Urchin D. Kelp 21. Benthic Macroinvertebrates are useful as indicator species to use to assess the chronic level of aquatic pollution because: A. They are very mobile and will escape in times of high pollution B. They are only affected by chemical conditions of a stream. C. Their life cycles are very short so they are all extra sensitive to pollutants. D. Many are the larval stages of important insects. E. They are relatively long-lived, stationary, and show effects of short- and long-term pollution events. 22. Chemicals classified as endocrine disruptors: A. May be responsible for intersex fish, i.e., a male fish with eggs. B. Interfere with the hormone/reproductive systems in animals. C. Are water soluble and degrade easily in the environment. D. Have no effects on humans. E. Both A and B are true. 23. A municipal sewage treatment plant is broken and leaks discharge into water of the Jones Falls. This causes oxygen-depleting nutrients and pathogens to pollute drinking water and swimming areas. This is an example of: A. Point source pollution. B. Non-Point source pollution. C. Both point source and non-point source. D. None of the above. 24. Which of the following statements is not true regarding the pesticide DDT? A. Its' effects were documented in the book "Silent Spring" by Rachel Carson. B. It had very harmful effects on birds, especially bald eagles. C. It is still used in this country to control mosquitos. D. It is a persistent organic pollutant and, therefore, stays in the environment an tissues of animals for a long time.Explanation / Answer
1. (c) Sea urchin, since Primary consumers are herbivotous and dependent on plants thus Sea urchin is Primary consumer.
2. (e) They are relatively long lived, stationary and shows effect of short and long term pollution events.
3. (e) Both, because male fish with eggs and abnormal hormone/reproductive system takes place due to endocrine disruptors.
4. (a) Point source pollution, as only a single identifiable source of pollution is creating pollutantion.
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