Unit 3: Learning Set 4

How did the worm interact with water?

• d. Worms swim to the surface of Earth when it rains a lot.

• b. The worm was not sensitive to the abiotic factor water.

• c. Worms can drown in too much water

• a. The worm was sensitive to the abiotic factor water.

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What might happen if there is a change in the abiotic factor? For example, what if the rainwater was affected by pollution?

• b. If there were a change in the abiotic factor, it would not affect the organisms that interact with that element, and it would not change the organism or the population.

• c. If there were a change in the abiotic factor, it might benefit the organisms that interact with that element, and it could change the organism or the population.

• a. If there were a change in the abiotic factor, it might be harmful to the organisms that interact with that element, and it could change the organism or the population.

• d. Humans are always able to reverse the negative effects of changes in abiotic factors.

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Look at the following food chain: Which organism will have the most amount of a pollutant that is released into the environment?

• a. Insect

• b. Toad

• c. Plant

• d. Hawk

• e. Snake

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Look at the following food chain: Which will have the highest amount of pollutants in their bodies, insects or snakes?

• b. Snake

• a. Insect

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According to this food chain below, why will hawks have the highest level of pollutants in their bodies?

• c. Hawks will have the highest amount of pollutants because they eat many of the other organisms that have the pollutant inside of them.

• a. Hawks will have the highest amount of the pollutant because they eat snakes which are really large animals.

• b. Hawks will have the highest amount of pollutants because they are large animals.

• d. Hawks will not have the highest amount of pollutants because they can get rid of the pollutants through their mouth.

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Why do you think the bald eagle was able to hatch more eggs and have more offspring once the spraying of DDT was banned?

• d. The eagles could build bigger nests after DDT was banned and so they were able to hatch more eggs.

• b. The eagles were able to produce stronger shells after there was no more DDT in the environment. The stronger shells meant that more offspring would be born.

• c. The eagles could stay in their nest longer after DDT was banned. This meant that more offspring would be born.

• a. The eagles could find more prey since DDT was banned. This meant that more offspring would be born.

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For how many years was the dioxin level in the Great Lakes above 100 ppt?

• c. The dioxin level was above 100ppt for about 30 years.

• b. The dioxin level was above 100ppt for about 20 years.

• a. The dioxin level was above 100ppt for about 10 years.

• d. The dioxin level was above 100ppt for about 40 years.

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What is the effect of that level of dioxin on the living things in the Great Lakes (including the trout)?

• d. Living things, including the trout, could not survive.

• b. Living things will have some minor effects on their bodies.

• c. Many living things will die.

• a. Living things can continue to live.

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Look closely at the year 1970. What happened with the dioxin level and the number of trout in the lakes?

• b. Leading up to 1970, the dioxin level was low and there were almost no trout left in the lakes.

• a. Up until 1970, the dioxin level was high and there were almost no trout left in the lakes.

• d. Prior to 1970, the dioxin level was low and there were many trout left in the lakes.

• c. In 1970, the dioxin level was still high and there were many trout in the lakes.

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What can you conclude from what you see in the graphs? Choose all that apply.

• b. The dioxin levels in the lake were dangerous around the time the trout started to increase again.

• d. The dioxin levels in the lake were very high during the time that the trout levels were highest.

• a. The dioxin levels in the lake were very high during the time that the trout levels were lowest.

• c. The dioxin levels in the lake were no longer dangerous around the time the trout started to increase again.

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