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And you see they are typically concentrated where we have more industrialized nations, where we have either more agriculture happening, more industrial agriculture, where they might be using more fertilizer and also where you might have more runoff from cities that will have eutrophiication like the phosphates, that will cause this eutrophication to happen. Eutrophication and eutrophicatoin zones. Well the issue is what happens once this algae dies.

And this is a serious problem. The bacteria will consume all of the oxygen in the water. We talked about that in the nitrogen and the phosphorous cycle videos. As the water, either due to rain or irrigation for the crops, as the water flows from those crops into local streams and rivers, it’ll eventually find its way into local eutropuication and rivers.

Pogil Activities For Ap Biology Eutrophication Answers

Science Biology Ecology Biogeochemical cycles. It’s making the water less clear.

It could just make the surface of the water a little bit less clear, a little bit green, but hey, there’s living things here.

So right over here is kind of a global picture of dead zones that we have and you see them all through the world.

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And it’s not just fertilizers, even some detergents in the past, they have, you have sodium phosphates, which once again, can cause this eutrophication. Eu referring to well and then trophic or trophia, referring to nourished, or nourishment.

So what has happened is, so let’s say that this right over here is some land. So, eutriphication over here is a satellite image of the Caspian Sea and you can see the eutrophication. Intro to biogeochemical cycles. Once this algae dies, and it starts to float down, that can be food for bacteria. So you have more phosphates in this, let’s say this is a lake of some kind, so I’ll make it big. This is another one, and you’ve probably seen this, especially in places that might have sewage runoff.

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And it comes from, or it’s derived from, the Greek for well nourished.

And because of that, we humans have added a lot of nitrogen and especially phosphates to plants in order to grow them better, because we need the plants to live, to have more food. And the biggest culprit here tends to be phosphates, the phosphorous in them, and that helps the plants grow more. If you’re seeing this message, it means we’re having trouble loading external resources on our website.

So these are all the crops that we’re growing. Let’s say this is a lake of it and we already know that things like phosphates are the rate-limiting factors for plants.

In order to ensure that the crops grow as much as they can, we add fertilizer to it, and a lot of that fertilizer might be nitrogen, it might be phosphorous in the form of phosphates, so we add fertilizer.

And so you might think that this is a good thing but as we’ll see over the course of this video, this is really about over-nourishment, and over-nourishment to the point that it’s actually causing very bad things to happen in our biosphere. That helps the plants grow more, which seems like a good thing, but there’s another side effect that happens because of this. And this is, let’s say that’s a farm, right over there on the land where we’re growing our crops. Now a lot of times when we think of ocean animals, so when we think of, I’ll just draw a little fish here, and so that’s a little fish, we don’t often think about the necessity of oxygen in the water.

And so the irony here is, by having this fertilizer runoff, by having these extra phosphates, this eutrophication, by allowing one thing to grow far more than it would have otherwise, it actually ends up depleting the oxygen that keeps other things from growing.

We have some pictures here.

And then we have a Dead Zone. And it actually creates what we call dead zones. On one level, phosphates and fertilizers, nitrates seem like a good thing, it’s helping us grow more crops, but we have to be very careful with where it actually ends up. It’s getting way more phosphates than eutrophicagion have typically happened just if there wasn’t fertilizer, if there wasn’t this runoff happening.

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And so this is where that algae is getting over-nourished. So this fish is going to die and other animals like it aren’t going to live because there’s not gonna be enough oxygen in that water. But ocean animals need oxygen just like we do, and they get that oxygen, waves can crash and as the waves crash it brings in oxygen from the surface that ocean animals can use in order to live, in order to do their respiration. But now all of a sudden, logil this eutrophicattion, because they’re able to decompose all this algae that is dying, if they’re consuming all of the oxygen, well it depletes the oxygen from the water so that the ocean animals can’t live there anymore.

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The algae can go crazy and grow all eutrpohication the surface of the lake. We’ve already talked about the role of oxygen in respiration.


And so, you could have photosynthetic organisms like algae in this lake and if it didn’t have the fertilizer you might just have a little bit of the algae.

So the general idea, we’ve already talked about things like nitrogen and especially phosphorous being a rate-limiting factor for how fast plants can grow. But now since they’re getting all of europhication phosphates, the algae can go crazy.

You can see the algeal, algal blooms throughout this area. And if you were to zoom in, let’s say on the Pogiil Sea, you can see this in more detail, you can visually see this.

This is potential eutrophication in this picture.