Welcome to today's lesson.

My name is Mrs. Mehrin, and I'm really looking forward to learning all about classification keys with you.

Let's begin.

Welcome to today's lesson from the unit living things and their environment.

Your learning outcome is, "I can use a classification key to group and identify objects." Now, I know that learning can sometimes be a little bit challenging, but that's okay because it just means that we are going to work really hard together and we are going to learn lots of fabulous new things.

Let's begin.

So here are your five key words for today along with the definition.

Now I am going to be referring to these throughout today's lesson.

However, if you find it helpful, you can pause the video here and you can jot these down.

Off you go.

Fantastic.

Well done.

So, our lesson today is split into two parts.

So let's begin with the first part, grouping objects.

Aisha and Izzy are playing with their toy bears, and Aisha observes that some of her toy bears are similar and some are different to Izzy's bears.

Look at these toy bears.

What similarities and differences do you observe? I'll give you five seconds.

Off you go.

Wonderful.

Well done.

So, Aisha says, "I would like to organise the toy bears into groups based on what is the same and what is different about them." And Aisha says, "Objects can be classified based on their similarities and differences." Now, how could Aisha classify the toy bears in different ways? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

Now Aisha observes that some of the toy bears are different colours.

So she says the toy bears can be classified into different groups based on their colour.

So you've got brown fur, black fur, orange fur, and cream fur.

Now, Izzy classifies the toy bears based on whether they are wearing clothing or not.

And she says the different coloured toy bears could belong to the same group because they're not wearing clothes.

So on the left-hand side here, we have four bears without clothes, and on the right we have four bears with clothes.

So Izzy has decided she can classify hers based on whether or not they're wearing clothes or not.

Now, there are lots of ways to classify the toy bears based on their similarities and differences.

So these toy bears here belong to the group of bears wearing a bow tie or scarf around their neck.

And these toy bears here belong to the group of bears wearing types of footwear.

Let's do a quick check-in of your learning before we continue.

It says, "Objects can be classified based on their similarities and differences.

Which group would this toy bear go in?" Would it go in toy bears wearing blue bow ties, toy bears wearing green scarves, toy bears wearing green bow ties, or toy bears standing up? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

It would be C.

Now, Aisha says, "I have heard of something called a classification key to help group objects, but I don't know what this is." Do you know? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So scientists use a special diagram called a classification key, to help them to decide which group something belongs to.

Now, Aisha's sister explains that Aisha has used a classification key before to decide which group different soils belong to.

So let's have a look at Aisha's classification key.

So she's got, "Does the soil feel sticky?" And she's got yes and no questions.

So yes, if it does, then she says, "Roll it into a ball.

Does it break easily?" And if it does break easily, it's silt soil, and if it doesn't, then it's clay soil.

Now, if the soil is not sticky, "Can you roll it into a bowl?" Yes, then it's loam soil, and no, then it's sandy soil.

So you can use an identification key to identify the soil type, and a classification key to group the different soils into.

Now she says, "Questions on a classification key are layered.

Each question leads to a new question." Just like this here.

Now, Izzy says, "We have also answered questions on a classification key to help decide which group different animals belong to." So, for example, here we've got, "Does it have wings?" If the answer is yes, the questions are layers, so there's another question.

It says, "Does it have feathers?" This time if the answer is yes, then it's a bird, and if it's no, then it's a mammal.

So it's a fantastic way to group different animals.

Just like.

Aisha says, "Ah, yes, I remember now.

Each box in a classification key contains a question and you can only answer yes or no." And Izzy says, "All our toy bears are mixed together now.

My sitting down bears are wearing a bow tie, my standing up bears do not have dark brown fur.

We can use the classification key to help us to identify which group each toy bear belongs to." So Aisha says, "The first yes/no question will classify all the bears into two groups." So, she's gone with the question, "Is the bear standing up?" And that's a great question because it's either yes or no.

So then you've got the sitting bears, if it's no, and yes, you have the standing bears.

The next layer of questions will divide the groups into smaller groups.

So it could be, "What colour of fur do the bears have?" And Izzy says, "Remember, classification keys have to have a yes or a no answer, and the answer to your question is the colour.

So you can't have that one." So Aisha tries again and she says, "So the next question could be, 'Is the bear dark brown?'" And Izzy says, "Yes, and we could also ask, 'Is the bear wearing a bow tie?'" Fantastic.

So, "Is the bear standing up?" No.

"Is the bear wearing a bow tie?" No, then you have two bears there, and yes, you have Aisha's bear.

Now on the other side, "Is the bear standing up?" Yes.

"Does the bear have dark brown fur?" No, then they are Aisha's bears, and yes, then they are Izzy's bears.

That's fantastic.

Really great yes and no questions there.

Now it says, "Use this classification key to help you decide which group this animal belongs to." So, "Does it have wings?" You need to decide yes or no.

And then depending on that, you need to ask yourself the next question.

So, I'm going to give you some time to do this now.

You may like to pause the video and then come back once you have classified this animal and grouped it into the correct animal group.

Okay, so I'd like you to pause the video here and have a go at doing this.

Off you go.

Fabulous.

Well done.

So, "Does it have wings?" Yes, it does.

"Does it have feathers?" No, so therefore it is a mammal.

It's a bat.

Now, the questions on classification are layered.

Each answer leads to a new what? Answer, question, or statement? I will give you five seconds to think about your answer.

Off you go.

Fantastic.

The answer is "question." The questions on classification are layered.

Each answer leads to a new question.

Now, here is your first task for today.

It says, "Use the classification key to help you to decide which group the toy bears on the next slide belong to." Aisha says, "Some of them belong to my group, and some belong to Izzy's group of toy bears." Izzy says, "Remember to classify the toy bears based on their similarities and differences." So, I'm going to show you the toy bears now.

Here are the toy bears.

And you're going to use the classification key to help you to decide which group the toy bears on the next slide belong to.

So remember, some of them belong to Aisha's group, some of them belong to Izzy's group.

So here is the classification key that you are going to be using.

And here are the bears.

So I'm going to go back to this slide here, but what I'd like you to do is to pause the video now and have a go at doing this activity.

Remember, you can go forwards and backwards in the video to have a look at the classification key and to have a look at the pictures of the bears as well.

So I'd like you to pause the video here and have a go at doing this activity.

Off you go.

Wonderful.

Well done.

So, let's have a look at the answers here.

So, "Is the bear standing up?" If it was no, then, "Is the bear wearing a bow tie?" If it was still no, then it's Izzy's bear.

But if it was wearing a bow tie, then it's Aisha's bear.

Now, if the bear is standing up and has dark brown fur, then it's Izzy's bears.

But if it does not have dark brown fur, then it's Aisha's bears.

So, have a look at yours and just check that you have got those correct.

I'll leave it on the screen for five seconds for you to have a quick check.

Fabulous.

Well done.

So now we are onto the second part of our learning today, which is using classification keys.

Now, Aisha and Izzy have been learning about classification keys, and she says, "Classification key can be used to help decide which group an object belongs to." Now, Aisha says, "I have heard that you can also use a classification key to identify an object when you are not sure what it is." Now, have you ever used classification keys to identify objects? I'll give you five seconds to have a think.

Off you go.

Fantastic.

Well done.

So classification keys can be used to identify objects through a series of yes/no questions.

And Izzy says, "To identify something is to be able to name it correctly." And Aisha says, "We asked yes/no questions in a game of 'Guess Who?' to identify children in our class." Now, Izzy remembers the rules of the "Guess Who?" game, and she says, "The questions must be based on observable characteristics." So things that you can see with your eyes.

"You need to make close observations of similarities and differences.

And the answers can only be answered with yes or no." So you can't ask, for example, "What's your name," because that's not a yes or no question.

Now, Izzy says, "Scientists use observable characteristics to identify objects through a series of yes/no questions." So Aisha says, "My question to try to identify the person was, "Do they have a brother?" And Izzy says, "We can't tell if someone has a brother just by looking at them.

The question must be based on an observable characteristics." So something that you can physically see.

Now, which of these yes/no questions are based on observable characteristics? "Do they have brown eyes?" "Do they play football?" "Do they have curly hair?" Or, "Do they like science lessons?" So remember, there might be more than one correct answer here.

So, I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

So it would be, "Do they have brown eyes?" and "Do they have curly hair?" Because these are things that you can look at a person and be able to observe to be able to see.

Now, which of these yes/no questions are based on observable characteristics? A, Does it have four legs? B, How many leaves does it have? C, What habitat does it live in? Or C, Is it longer than one metre? So again, I'll give you five seconds to think about your answer.

Off you go.

Wonderful.

Well done.

So it would be A and D.

Now, scientists use classification keys based on observable characteristics.

They focus on the properties or features of the objects that they can see or use other senses to observe.

And observable characteristics can include information about colour, size, shape, or structure.

Now these objects belong to the group called fruit, and we've got fruit one, fruit two, fruit three, fruit four, and fruit five.

It says, "Can you identify the fruit in each photograph?" I'll give you five seconds.

Off you go.

Fantastic.

Well done.

So Aisha and Izzy can use a classification key to identify the fruit that they do not know.

So I'm not going to reveal the answer.

So Aisha says, "I will identify fruit one using the classification key." So first question, "Is it round?" Yes, it's.

"Does it have lots of small seeds?" No, it doesn't.

So that must mean that it is a coconut.

Now the second one, Aisha says, "I will identify fruit two using the classification key." So, "Is it round?" No, it's more of an oval shape.

"Does it have one large stone in it?" Yes, therefore it must be an avocado.

So fruit two is an avocado.

Now, Aisha says, "Wow, classification keys are really useful to help us to identify objects." And Izzy says, "We will use the classification key to look for observable characteristics and identify the rest of the fruit we have for break time." So, a quick true or false.

Classification keys are used by scientists to measure objects.

Is that true or false? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

Well done.

The answer is false.

Now let's see if you can justify your answer.

Is it because A, scientists use classification keys to unlock and open doors to their laboratories? Or B, Scientists use classification keys to identify objects? Again, I'll give you five seconds to think about your answer.

Off you go.

Fabulous.

Well done.

The answer is B, scientists use classification keys to identify objects.

Now, which of these characteristics would a scientist use in a classification key to identify fruit? Would they use the colour of the fruit, the price of the fruit, where the fruit grew, or the shape of the fruit? I'll give you five seconds to think about your answer.

Off you go.

Fabulous.

Well done.

The answers are A and D.

Now, here is your final task for today and it says, "Use the classification key on the next slide to identify the fruit below.

Remember to use observable characteristics to answer the series of yes/no questions." So here is the classification key that you are going to be using for this activity to find out what these fruits are called.

So I'd like you to pause the video now and have a go at doing that.

Off you go.

Fabulous.

Well done.

So we've got the starfruit there, which is shaped like a star, the pomegranate, and the kiwi.

Well done.

Now we are onto the summary of your learning today.

So objects can be classified based on their similarities and differences.

You can use the classification key to help decide which group something belongs to, and also to identify objects.

The yes/no questions on a classification key are layered.

Each answer leads to a new question.

Scientists use classification keys based on observable characteristics.

Those things that you can see.

Now, you have worked so well and I'm really proud of all of your critical thinking and your hard work using classification keys today.

Well done.