Lesson Worksheet: Pollution and Eutrophication Biology

In this worksheet, we will practice recalling sources of pollution, and discussing the effect of pollution on biodiversity.

Q1:

Acid rain is a product of pollution. It forms when gases, like sulfur dioxide, dissolve into rain water. What human activities release these gases?

  • ABurning fossil fuels
  • BRemoving trees from forests
  • CReleasing sewage into oceans
  • DIntensive farming
  • EUsing pesticides, which run into waterways

Q2:

Which of the following statements correctly links pollution and biodiversity?

  • AThe more polluted an area, the higher the biodiversity, as more species can survive.
  • BThe more polluted an area, the lower the biodiversity, as fewer species can survive.
  • CThere is no correlation between pollution and biodiversity.

Q3:

The passage below gives a brief description of the process of eutrophication:

A fertilizer is added to the fields and is washed off by heavy rain. This fertilizer runs into rivers and streams where the excess nutrients cause algae to grow rapidly. The algae cover the surface of the water and block sunlight from reaching the plants below the surface. These plants can no longer , and so they do not produce oxygen. The fish and other aquatic organisms that need oxygen to now die.

What word should replace the first blank?

  • Aphotosynthesize
  • Btranspire
  • Crespire
  • Dthermoregulate

What word should replace the second blank?

  • Aphotosynthesize
  • Bthermoregulate
  • Crespire
  • Dtranspire

Q4:

The graph shows the changes in sulfur dioxide emissions in China over time. What implications would you expect this to have on the volume of acid rain falling?

  • ABetween 1975 and 2000, the volume of acid rain would have increased.
  • BBetween 1975 and 2000, the volume of acid rain would have decreased.
  • CThe volume of acid rain would not have been affected by the changes in sulfur dioxide emissions.

Q5:

The passage below gives a brief description of the process of eutrophication:

A fertilizer is added to fields and is washed off by heavy rain. This fertilizer runs into rivers and streams, with the excess causing algae to grow rapidly. The algae cover the surface of the water and block sunlight from reaching the plants below the surface. These plants can no longer photosynthesize, and so they do not produce . The fish and other aquatic organisms can no longer respire, and so they die.

What word should replace the first blank?

  • Aoxygen
  • Bnutrients
  • Cwater
  • Dsunlight

What word should replace the second blank?

  • Aglucose
  • Boxygen
  • Ccarbon dioxide
  • Dwater

Q6:

The diagram provided shows the basic process of bioaccumulation in different organisms in an aquatic ecosystem. The buildup of a toxin is represented by the yellow dots. Which of the following best defines bioaccumulation?

  • ABioaccumulation is the interaction between organisms in a food chain for resources.
  • BBioaccumulation is the gradual breakdown of toxins by the organisms in a food chain.
  • CBioaccumulation is the buildup of toxins in an organism, which most severely affects organisms at the top of a food chain.
  • DBioaccumulation is the build up of toxins in an organism, which most severely affects organisms at the bottom of a food chain.

Q7:

The diagram provided shows the basic process of eutrophication. It begins with excess fertilizers from agricultural lands being washed off and into nearby rivers and streams.

What happens at stage 2, after the fertilizer has entered the water?

  • AThe fertilizer releases poisonous chemicals that instantly kill off the animals living in the water.
  • BThe fertilizer releases toxins into the water, which kills the algae that reside on the surface.
  • CThe fertilizer releases excess nutrients into the water, which increases the growth of algae.
  • DThe fertilizer releases excess nutrients into the water, which increases the growth of aquatic animals.

What happens at stage 5?

  • AThe light reaching the fish has been reduced, so they migrate away.
  • BThe carbon dioxide concentration of the water decreases, so aquatic plants can no longer carry out photosynthesis.
  • CThe temperature of the water decreases, and the aquatic organisms start to die.
  • DThe oxygen concentration of the water decreases, and the aquatic organisms die.

Q8:

The diagram provided shows the basic process of bioaccumulation in different organisms in an aquatic ecosystem. The buildup of a toxin is represented by the red dots. What will happen to the orca in this food chain?

  • AThe orca will only consume one sea lion, so the orca and the sea lion will have equal amounts of the toxin in their systems.
  • BThe organisms below the orca in the food chain will break down the toxin, so none of it will pass to the orca.
  • CThe orca will only consume organisms that are not contaminated, so it will have a decreased food source.
  • DThe orca will consume multiple contaminated organisms, so it will have a higher amount of the toxin in its system.

Q9:

The diagram provided briefly outlines the process of eutrophication of a river. If this occurs, what will happen to the biodiversity of the river?

  • AIt will increase.
  • BIt will decrease.
  • CIt will remain the same.

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