Due to __________________, the release of DDT into the environment to control so

Question

Due to __________________, the release of DDT into the environment to control some insect pests will result in the highest detectable concentrations in the top carnivore of the food web.

1)            bioremediation

2)            toxicity

3)            extirpation

4)            biological magnification

European rabbits were introduced into Australia and quickly spread, reproduced, and became a terrible pest. They eat up to $600 million worth of food and pasture crops annually, and have damaged the populations of many native plants and the populations of animals that eat the plants. Twice in the past 50 years, rabbit diseases have been introduced to try to control the population, with some success. This is a case where ________.

1)            an extirpation has occurred

2)            habitat alteration resulted in decreased biodiversity

3)            an invasive species has caused overharvesting

4)            climate change has decreased the genetic diversity of indigenous species

5)            an invasive species has reduced the genetic diversity of indigenous species

Mercury is not readily excreted; it is stored in mammalian body tissues. This is best described as ________.

1)            bioaccumulation

2)            biomagnification

3)            synergism

4)            toxification

Acute exposure to chemical agents is _____________________ chronic exposure.

1)            easier to detect than

2)            is much harder to detect than

3)            more difficult to detect than

4)            no harder to detect than

Carcinogens cause ________ and may be difficult to identify because ________.

1)            cancer: there is no way to measure the carcinogenic potential of a substance

2)            radon: they are rare in nature

3)            radon: most are invisible

4)            cancer: there is a long lag time between exposure to the agent and disease

5)            neurological damage: they are the least common toxicants

Explanation / Answer

Due to __________________, the release of DDT into the environment to control some insect pests will result in the highest detectable concentrations in the top carnivore of the food web.

(4) biological magnification

It is the process in which certain substances like pesticides or heavy metals work their way into water bodies and then move up the food chain.

European rabbits were introduced into Australia and quickly spread, reproduced, and became a terrible pest. They eat up $600 million worth of food and pasture crops annually, and have damaged the populations of many native plants and the populations of animals that eat the plants. Twice in teh past 50 years, rabbit disease havae been introduced to try to control the population, with some success. This is a case where

(5) an invasive species has reduced the genetic diversity of indigenous species

Mercury is not readily excreted; it is stored in mammalian body tissues. This is best described as ________.

(1) bioaccumulation

The accumulation of substances like pesticides, or other chemicals in animal.Bioaccumulation occurs when an animal absorbs any object at faster rate than the substance is lost by catabolism and excretion.

Acute exposure to chemical agents is _____________________ chronic exposure.

(3) more difficult to detect than

Chronic exposure is more difficult to measure and diagnose because it occurs over long periods of time, and its effects may not be immediately apparent

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