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What is Bioaccumulation — Reading Comprehension

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This engaging 4th-grade science reading passage, with audio integration, introduces students to the important ecological concept of bioaccumulation. The passage explains, in simple terms, how harmful substances like chemicals and heavy metals can accumulate in living organisms. It defines key terms such as bioaccumulation and biomagnification, using easy-to-understand analogies like a sponge soaking up water. The content aligns with the NGSS standard LS2.A: Interdependent Relationships in Ecosystems, helping students understand how organisms interact with their environment and how these interactions can be affected by pollution. The passage also includes a fun fact to capture students' interest and is followed by eight multiple-choice questions to assess their comprehension at different DOK levels. The questions test everything from literal recall to the application of learned concepts to new scenarios. With its audio-integrated format, this resource is perfect for diverse learning needs, providing a comprehensive and accessible way to explore how pollutants move through ecosystems.

CONTENT PREVIEW

Bioaccumulation is a process where harmful chemicals called toxins build up inside the bodies of living things over time. These toxins often come from pollution in our environment, such as chemicals in water or soil that animals can't get rid of easily.

One way bioaccumulation works is through the food chain. Here’s how it happens step by step:

Step 1: Tiny plants and algae in water absorb a little bit of pollution.

Step 2: Small fish eat many of these plants, so they collect more toxins in their bodies.

Step 3: Bigger fish eat lots of small fish, and the toxins add up even more in their bodies.

Step 4: Animals at the top of the food chain, like eagles, eat many big fish. These top predators end up with the most toxins of all.

This build-up can be dangerous. Too many toxins can make animals sick or even stop them from having healthy babies. For example, a pesticide called DDT got into lakes and rivers. Fish collected DDT in their bodies, and eagles that ate the fish got so much DDT that their eggshells became too thin. Many eagle eggs broke before hatching, and the eagle population almost disappeared!

Bioaccumulation is like collecting a penny from everyone in your school. One penny isn’t much, but if you collect from hundreds of students, you end up with a lot! In the same way, each step up the food chain adds more toxins.

That’s why protecting our environment from pollution is so important. We need to reduce pollution in water and be careful about what fish we eat, so that animals and people stay healthy. Stopping pollution at the source helps everyone in the food chain.

Interesting Fact: The bald eagle, America’s national bird, made a comeback after DDT was banned and now lives in all 50 states.

What is bioaccumulation?

Build up of toxins in animalsAnimals growing biggerPlants making foodFish swimming in rivers

Which animal gets the most toxins?

Tiny plantsSmall fishBig fishEagle

What happened to eagle eggshells from DDT?

Eggshells became thickEggshells became thinEggs got largerEggs changed color

Why is pollution in water a problem?

It helps plants growIt adds toxins to animalsIt makes water blueIt keeps fish warm

What is a food chain?

Order of eating and being eatenA tool for catching fishA place where birds liveA kind of pollution

How can we help stop bioaccumulation?