Chapter 24. 24·11–24·12 Environmental contaminants can disrupt...

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 24·11–24·12 Environmental contaminants can disrupt normal hormone functioning by answering the following questions.

1.

1. Why does the release of synthetic and natural chemicals into the environment cause a reduction in wild populations?

They disrupt food chains by causing confusion between predators and their prey.

They block or interfere with the normal functioning of animal hormones.

They mimic enzymes found in the digestive track and cause many types of animals to starve to death.

They are largely acidic and cause death when animals are exposed to them.

None of the above is correct.

Correct. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

Incorrect. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

2.

2. Which of the following is a known effect of high DDT levels in animals?

production of abnormally thin and weak eggshells in birds

increased aggressiveness, especially in birds of prey

increased reproductive success, causing overpopulation of some species

feminization

Both A and D are correct.

Correct. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

Incorrect. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

3.

3. Which of the following chemicals are known to disrupt normal endocrine function in animal wildlife?

bisphenol A in plastic bottles

DDT in insecticides

PCBs in industrial coolants

antibiotics in livestock products

Answers A, B, and C are all true.

Correct. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

Incorrect. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

4.

4. The banning of which of the following compounds is cited as the instrumental reason why bald eagles have returned from near extinction?

DDT

phtalates

bisphenol A

over-the-counter birth control pills

PCBs

Correct. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

Incorrect. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

5.

5. Which of the following is a way in which chemicals that cause endocrine disruption enter the environment?

airborne pollution

industrial runoff

untreated sewage

agricultural runoff

All of the above are ways in which human-produced chemicals enter the environment.

Correct. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

Incorrect. (See section 24·11 Chemicals in the environment can mimic or block hormones, with disastrous results.)

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