Lesson video

Hello everybody.

Welcome to your fifth lesson on this unit with me Miss Roberts.

It's so great to see you all back here and I've really enjoyed this unit so far.

So today we're thinking about how we construct a food web.

I've got Lenny the lion here, and he's enjoyed this unit so far too.

So if you want to go and get your favourite Teddy go and put them by your screen now.

The other things that you're going to need are a pencil or a pen, a ruler, and a notebook.

So pause the video and go and get the things you need now.

Let's just do a recap at the start.

So plants make their energy from sunlight, we did this last lesson, so does that make them a producer or a consumer? Can you tell the screen? Well done, a producer.

So what was the other one? Can you tell the screen? Well done, a consumer, but what was the definition of a consumer? Let's see if you're right.

Animals, they get their energy from food.

Well done, they are all consumers.

Okay, so in today's lesson, we're going to do our star words, we've done our recap, and then we're going to think about how food webs are drawn, then we're going to try and draw our own food web and you can see my awful drawing.

'Cause I'm not very good at drawing animals team.

I'm sure you're much better than I am, but I've had to go.

And then at the end, I've got a task for you.

So let's have a look.

I might send you a 10 star words, star words, star words.

Good job, we've already looked at what a producer is.

What's a producer? Can you tell a screen? Well done, a producer produces its own food from sunlight to get its energy, and we did this last lesson.

So energy transfer, you're turn.

Well done, primary consumer, your turn, food web, your turn, food web, your turn, next word, consumer, your turn, and tertiary consumer.

What does tertiary mean again team? Well done, tertiary means third.

So, let's recap what a food chain is now.

A food chain is the transfer of energy between different organisms. You always start with a producer and then can you remind me why does the arrow always point to the right? Good, because it's showing the transfer of energy along the food chain.

So after the producer, we then have the snail, which is the primary consumer.

After the primary consumer comes the secondary consumer.

And what comes last? What was that owl in this food chain? Well done, it's the tertiary consumer.

Remind me one more time, what do the arrows represent? The transfer of energy, well done.

So I would like you to construct this food web and add the labels in, because it's all jumbled up.

You've got an owl, a vole, a leaf, and a centipede.

I need you to think carefully about which animals eat what.

So for instance, do you think the centipede eats the owl? I don't think so either, now I've given you a clue because I've also given you the labels, but they're also in the wrong order.

So all you need to do is put all of the animals, sorry, all of the organisms, 'cause there's a leaf there and all of the titles in the correct order.

you can tell your screen or you can jot them down in your notebook.

Pause the video and have a go now.

Okay, pause the video if you need more time, 'cause I'm going to go through the answers.

Are you ready? here are your answers.

The leaf was the producer because we know that leaves produce their own food from sunlight.

Then the centipede was the primary consumer.

The vole was the secondary consumer because voles eat caterpillars.

And then the owl eats voles, so that makes it the tertiary consumer.

Well done, I hope a good go with that.

Give yourself a Pat on the back 'cause you're working really hard so far this lesson.

So now we are going to think about food webs and how they're drawn.

What I'm going to do is I'm going to show you something on my visualiser, because it's interesting that we've talked about food chains and for something like grass, which is an organism, it is eaten by lots of different animals.

We've only looked to food chains with one step on each level, but in food webs, it can represent the more complex ecosystem that occurs.

So let me show you what I mean, I'm going to tell him I visualiser around so that you can see, if you promise not to laugh at my drawings.

So here, this was my food chain from last lesson, you have the producer, which was a flower, which is eaten by a butterfly.

The butterfly was eaten by the frog and the frog was eaten by the snake.

However, we know that in the world, it's not as simple as that and there are lots and lots of other organisms around.

And we also know that lots of other organisms eat flowers, just butterflies is not an ideal representation.

This is just a snapshot.

I also know that there are lots of other things that eat butterflies, not just frogs, and that's what food webs try and represent.

So let me show you.

Here in my food web so far, this is not finished, this is just the start.

Let me just, that'd be good.

Let me see if it'll, there we go.

So for instance grass, grass is eaten by lots of different organisms and lots of different animals.

Here, I can show that the energy from the grass can be transferred to a rabbit and also to a deer.

In a food chain, you would only have one of those animals.

You may just have grass and then rabbit, and then some other consumers here, but in a food web, you can represent the fact that the grass, the energy can be transferred to both the deer and the rabbit.

So that was me starting to draw a food web, and now what I'm going to do is I'm going to show you a finished drawing, a finished image of the food web, here we go.

So just like mine you can see that on the left hand side was the grass and that's also eaten by the deer.

So there is an arrow from the grass to the deer.

There is also an hour from the grass, and now in this case it was a vole, I found a rabbit easier to draw, so I did a rabbit because grass is all to eaten by rabbits.

So in this image on your screen, grass is also eaten by the vole.

Now because he lots of other arrows on the screen and it looks at it's a bit complicated, but don't worry team I'm going to talk you through.

Let's stay on the vole and I'd like you to put your finger on the vole.

There's one arrow going from the vole to the fox, can you put your finger along that arrow? That's showing the energy being transferred from the vole to the fox because fox is eat voles.

Now I'd like to go back to the vole and follow the other arrow.

What is the other animal that energy is transferred to? Well done, the hawk because hawks also eat voles.

So pause there, take a big deep breath.

This is tricky, which two organisms on your screen eat voles? Hawk, well done, and fox, well done.

Now, before we carry on, what are the two organisms that eat the grass? We've done those already, the vole and the deer well done.

Okay, so now put your finger on the fox and I'd like you to go up to the animal at the top right hand side of your screen.

That is a wolf because wolves eat foxes, so the energy can be transferred from foxes to wolves.

Now put your finger back on the fox, well done.

Now, where does the other arrow go to the, down to the right, the hawk, well done.

So what are the two organisms that eat foxes? Wolves and hawk, well done.

So in this food web, you can see that there are animals that are eaten by more than one consumer.

So how do we go about drawing this? Let's have a think.

I'm going to show you some organisms on the screen.

This is a dragonfly nymph, can you say dragon fly nymph? Well done.

Now a microscopic algae.

Can you say microscopic algae? The next one is a mayfly nymph.

Can you say mayfly nymph? Well done.

Now, I'd like to say freshwater shrimp, good job.

Can you read that next one to yourself? What does it say? Brown trout, well done.

What does that next one say? Pond weed, well done.

Now, before we go any further, I want to think based on the images and what you know about Science, which one of the organisms on the screen do you think is the main producer, which one of those produces its own food? Can you tell your screen? The pond weed, well done.

So if I was going to start my food web, I would start it as follows because I know that pond weed is the producer.

So I'm just going to go full screen, I'm going to turn to my visualiser and then I'm going to show you here.

So in order to start a food web, let's make it in focus, are we good? We're going to have a title of food web, I'm going to use my best handwriting, I'm going to underline it with a ruler.

So just like my food web before I had my producer on the left, and I'm going to do the same with this food web.

And my producer in this case was my pond weed.

So, I'm going to get my green and I'm going to draw my pond weed.

Well, that makes pencil look very big.

It doesn't have to be detailed, just needs to be the key information because this is just a diagram.

So I'm going to label it pond weed and that is the start of my food web.

So I want you to pause the video and draw yourself a title and your pond weed on your book now, off you go.

Well done, okay, so now you've been introduced to all of the organisms. Now I'm going to talk you through what your task is.

Let me just turn off my visualizer first.

Okay, so your task is as follows, all of the organisms that I've just introduced you to are now on the screen, but they're in a table.

And on the right hand side, the column that says diet is all about what they eat.

So if you have a look and go right down to the bottom, you'll see pond weed and it says, what does it say in the diet box? It says, makes its own food, while done.

And that's now confirming to me that I know that pond weed is a producer.

Can you see another producer in this table? Which other organism makes its own food? Well done the algae, the microscopic algae.

So let's add that to our food web.

Now, I'm going to get my pen and I'm going to turn over my visualiser.

So here we go, let's make that bigger.

So I've got my pond weed, I'm also going to go over here, now although it's microscopic, I'm just going to do a few little bubbles to show that this is microscopic algae.

I'd like you to pause the video and draw your microscopic algae on your food web now.

Good job, now my question for you is, do I need an arrow between my pond weed and my microscopic algae, yes or no? No I don't, because in my table it doesn't tell me that the microscopic algae eats the pond weed or vice versa.

The pond weed doesn't eat the microscopic algae, so I can just leave those as they are, because I know that I'm going to need some arrows later.

Now on the table, what I'd like you to do is I'd like you to find one organism that eats pond weed in its diet, have a careful and really close look, where can you see pond weed in the diet? Good job, in the mayfly nymph.

So what I now want to do is add my mayfly nymph to the pond wheat.

So I'm going to draw a very small fly and I'm going to label it, so they don't get confused.

This is my mayfly nymph, okay.

So I saw that in my table, it says that it eats pond weed for its diet.

So I need to have an arrow between the pond weed and the mayfly nymph, let's just make this bigger.

So do I want to draw the arrow from the pond weed to the mayfly nymph? Or do I want the arrow going from the mayfly nymph to the pond weed? Which direction is the energy being transferred? Can you tell your screen now? Well done, the energy is being transferred from the pond weed to the consumer, which is the mayfly nymph.

So draw your arrow on now.

Okay, you should be up to speed with me on your food web, if you're not pause the video and have some time to catch up.

If you also noticed in the same box of the diet of the mayfly nymph, it also says microscopic algae.

So that means that the mayfly nymph also eat microscopic algae.

So it doesn't just eat one thing, and we know that's true for many organisms. So let's go back and think, this may fly nymph, not only it's pond weed, it also eats microscopic algae.

So what do I need to add? Well done, I need an arrow.

Do I transfer the energy from the algae to the mayfly or the other way round? Can you tell your screen? Well done, it gets transferred from the microscopic algae to the mayfly nymph, because again, the mayfly nymph is the consumer.

Pause the video and add on your arrow now.

Well done, you guys have done that so well, I'm just going to turn off my visualiser for a moment so I can see you.

Okay, well done team Now that's not the end of our food web, we've not finished, but that's how to get started withdrawing a food web.

I now I'd like you to finish that food web, using the information in this table.

You need to read through the diets of each organism and then just like I did draw the arrows on as you go.

So pause the video, use the table and finish your food web, off you go.

Okay, pause the video if you need more time on that table and finishing your food web.

I'm going to show you the answers one by one, are you ready? Okay, so the food web that we had is as follows, the pond weed was eaten by the mayfly, algae was also eaten by the mayfly, and it was also eaten by the shrimp.

So from the algae, you should have also have two arrows off.

The mayfly was also eaten by the dragon fly, the shrimp is also eaten by the dragon fly, which also gets eaten by the brown trout, the brown trout also eats the dragon fly and the mayfly.

Now, although there's lots of arrows on that food web, if you want to, you can go back and watch the video, step-by-step again, not only to watch me just start drawing my food web, but also to check that you've got all of those answers correct? I'm sure you have team and you've done really well because that's quite a tricky thing to do.

You've now drawn a food web all by yourself, you are such an excellent scientist.

Well done everyone you've done really well today.

I'm really proud of your learning in ecosystems. We've done food chains and food reps.

We've got one more lesson to go and I can't wait.

So see you next time, bye.