Lesson video

Hello and welcome to today's lesson from the unit, Growing Plants.

This lesson is called Plants Without Warmth.

Hi.

My name is Mrs. Waller, and in this unit so far you will have been growing plants and taking certain things away from them that they need.

In today's lesson, you are able to find out and describe what happens when plants do not have warmth.

Let's take a look at the words that we'll be using in the lesson today.

Plant, warmth, temperature, suitable and record.

Take a moment to think about these words.

Do you already know what some of these mean? The lesson today is in three parts.

Our first part will be observing our plants with no warmth.

And then in the second part we'll be thinking about what happens to plants with no warmth.

And in the third and final part, we'll be learning about how much warmth do plants need.

We know that all living things need a place to live and this place needs to provide the right temperature which we would call warmth for them to stay alive and keep healthy.

Let's take a look at where some living things live.

This bird lives in a nest.

The meerkat lives in a hole in the ground called a burrow.

This sunflower is growing in a field.

Think about how did these places provide warmth for the plants and the animals that live there.

Have a look at these children playing in the summer.

It looks like a very hot day.

How are they managing to keep their bodies at the right temperature? And how about on a really cold day in wintertime? How is this child making sure that he doesn't get too cold? If it gets too hot or too cold, some animals and plants cannot survive.

We know that plants are living things just like animals.

Plants need the right temperature for them to grow and stay healthy.

If it gets too warm or if it gets too cold, some plants will not be able to survive.

A greenhouse has glass walls and a glass roof.

Have you seen a greenhouse before? It's a great place to grow plants because it stays warmer inside even in the wintertime so plants can continue to grow.

And now I'm going to ask you a few questions to check your understanding.

And the first question is, the place where a plant or an animal lives can provide warmth.

Is that true or is that false? Yes, it's true, isn't it? Have a think about why do you think that it's true? I think this because here are some ideas that you might like to choose from.

Plants and animals need sunlight and shelter to keep warm or plants and animals need blankets and covers to keep warm.

Which one do you think? Yes, that's right.

Plants and animals need sunlight and shelter to keep warm.

Well done.

Which statement below is true? Plants do not need warmth to stay healthy, only some types of plants need warmth to stay healthy, or all plants need warmth to stay healthy.

What do you think? And the answer is C.

All plants need wants to stay healthy.

Our science question that we've been investigating is, what happens to plants when they do not get what they need? In this lesson, you'll observe your plants that have been growing with no warmth.

What do you think will happen to a plant with no warmth? Moving on to your first practise task now.

In the lesson today, you're going to observe your plants that have been growing with no warmth.

And don't forget, you need to compare that plant to a plant that's been growing with everything, so it's had water and warmth and light.

Don't forget, before you make your observations remember what a healthy plant looks like.

We know that healthy plants can have tall strong stems and they can often have green shiny leaves.

Can you remember anything else? Post the video and make your observations of your plants growing without warmth and your plants growing with everything.

Now, your second practise task is to make a record of today's observations.

This is the end of the with no warmth investigation.

So it's time to record what we've observed.

You might be using a chart like I am, but don't forget there are other ways of recording.

So here's my chart that I've been using to record my photographs.

We have the plants at the very start of the investigation.

And then after one week of growing without warmth, I took some more photographs and I added those into my chart so that we could see what was happening to the plant with no warmth and also what was happening to the plant with water, light and warmth.

So we've got our final part of our chart to add to today and I haven't recorded them yet.

So I've got my two plant pots here to show me where to add in to today's observations.

Remember, you might prefer to draw pictures or write about your plants.

Now I'm going to show you what's happened to the plants that I've been investigating with.

So I've taken my photograph of the plants at the end of today's no warmth investigation.

Oh, wow.

Can I ask you? Were you expecting my plant to look like this? So this is the plant at the end of the investigation.

It's been growing in a cold place with no warmth.

It certainly doesn't look very healthy, does it? So should we compare that to the plant that has had warmth? And here's my photograph that I've taken today.

Wow, it's growing even taller.

It's got lots of healthy green leaves on it.

It certainly does look very different to the no warmth plant.

Do yours look the same? So what I'm going to do now is, I've got my chart for my results and I'm just adding in my final photographs to show my plant that was growing with no warmth and my plant that was growing with everything.

Take a moment just to compare the results of my investigation to the one that you've been doing.

Are your results similar or different to mine? We're now moving on to the second part of today's lesson where we find out what happens to plants with no warmth.

We found out today that plants grow best when they have warmth.

Most plants begin to grow in spring and summer when the weather is warmer.

Some buds might begin to grow on trees before the springtime if the weather has been warmer in winter.

Have you ever noticed that happening? We know that plants grow more slowly or stop growing altogether in colder temperatures.

Deciduous trees lose their leaves in autumn and winter when it's colder.

I'm sure you've all noticed the leaves falling off some of the trees, deciduous trees that lose their leaves when the weather starts to change in the autumn and into the wintertime.

Something else that you might have noticed that the grass doesn't need cutting as often or even not at all when the temperature is lower.

Plants growing without warmth can become unhealthy.

This crest was grown in a cold place for three weeks.

Wow.

What do you observe? This poor plant certainly does look very different to the healthy crests that I've seen growing.

Some of the things that you might observe is that the leaves have dried out and they've curled.

Also.

The leaves have changed colour to a brown colour and definitely the stems of wilted.

Can you see how droopy and floppy they are over the side of the dish? Some plants without warmth may eventually die.

Moving on to some quick questions now to check your understanding of this part of the lesson.

Which of these statements is true? Plants grow more quickly when it's cold, plants grow more slowly when it's cold, or plants grow the same amount when it is warm and cold.

Yes, that's right, B.

Plants grow more slowly when it is cold.

If you remember the cutting of the grass in the autumn and of the wintertime, the grass is hardly growing at all when it's colder.

It appears to have stopped growing.

Ready for the next question? Aisha grew grass from seeds in a warm room and a cold room.

She counted the blades of grass and recorded this in a table.

So we don't know which room is which, do we? It just says, room A and room B.

One of them is the warm room and one of them is the cold room and our job is to work out which one is which.

So let's have a look at the information.

We've got number of blades of grass, and after two weeks, let's have a look.

In room A, there was 14 blades of grass and in room B there was 20 blades of grass.

So a little bit more in one of the rooms. And then she counted again after six weeks.

In room A there was 43 blades of grass, and in room B there was 85 blades of grass.

So one of those rooms you can definitely see that more grass has been growing.

So our question is, which room do you think was cold? Do you think it was room A or do you think it was room B? Take a moment to think about it and can you explain why you think this? So the cold room was room A, yes because it started off with 14 blades of grass and then after six weeks there was only 43 blades of grass.

So the grass in that room had obviously grown more slowly or not grown as well.

So room A was the colder room.

We're now moving on to our practise tasks now.

And I'd like you to talk to somebody about what you found out today about what happens to plants when they grow with no warmth.

So if you can remember in our lesson three, we started thinking about healthy and unhealthy plants.

And you might have drawn a picture of what you thought a plant looked like that didn't have warmth.

It would be really interesting to look back at that picture or the writing that you did to see if you were correct.

Now for the task today, I would like you to draw another picture or write another description about what does happen to plants when they do not have warmth.

So look at your own plants that have been growing and think about what you've learned today.

I've got some suggestions for you here.

So a drawing might look like this.

Something similar.

If you did a drawing, is it anything like this one? We've got this brown, wilted, crunchy, crispy plant that's certainly looking very unhealthy because it's being grown with no warmth.

If you've written a description, it might be something similar to this.

Plants can grow more slowly or stop growing in colder temperatures.

The leaves can dry out, turn brown, curl up and even fall off.

The stem can no longer stand tall, so it wilts.

Have a think about this one now.

Jacob grows vegetables at his allotment.

In the winter, he covers them with a clear plastic sheet.

Have a look at the photograph of Jake's allot, have a look at the photograph of Jake's allotment.

You can see that he's growing lots of different vegetables in different raised beds in his allotment.

It's definitely wintertime, isn't it? Can you see the frost and snow? And if you look really closely, you can see that he's covered his vegetables with clear plastic sheets.

Now, why do you think he's done that? So why do you think he covers the plants in the winter and why do you think he uses clear plastic? Take a moment to think like a scientist.

I've got some ideas here for you to compare what you are thinking to mine.

So do you think maybe, I think the plastic traps warm air around the plants when it is colder in the winter.

And also, do you think that the clear plastic is transparent and that means that you can see through it, so therefore the plants will still get light? Do you have some other ideas? We're going to be moving on to the third and final part of this lesson now where we're learning about how much warmth do plants need.

We know that a suitable temperature for most plants to grow and stay healthy indoors is 22 degrees Celsius.

Now if you have a thermometer, if you are in school or if you are learning somewhere else, maybe at home, if you have a thermometer, it would be great to check the temperature of the room where you are to see whether it's a good place for growing plants.

Is it around 22 degrees? Is it much warmer than that to where you are or is it much colder than that where you are? Would it be a suitable place for growing plants? Plants don't just grow indoors, do they? Many plants grow outside in different temperatures around the world.

Let's think of a few examples.

So we have these beautiful sunflowers here growing outside, and they grow really well in temperatures up to 30 degrees Celsius.

But sunflowers, they do love the sun but they cannot survive in anything hot than that.

Or yes, you've guessed it, they will begin to wilt.

We have this fantastic plant here from Australia.

Take a look at the photograph.

Does it look to you like a bottle brush? Have you seen a brush that's used before for cleaning the inside of bottles? Well, if you have, you'll definitely think that it looks very similar because of the shape of its unusual flowers.

The bottle brush grows best in warm weather.

And yes, it does grow outdoors at temperatures up to 32 degrees Celsius.

So we've been thinking about warm places, but what about cold places? Some places are just too cold for plants to survive.

Can you think of anywhere? The first example that I can think of is Antarctica.

Now that's a continent on the South Pole and it's the coldest place on Earth.

No humans live there because it is just too cold.

And most of the land as you can see by that photograph, is covered in ice.

So very few plants grow there.

Plants can become unhealthy if they've had too much warmth or not enough warmth.

So as we've been learning, all plants need the right temperature and we call that a suitable temperature.

Take a look again at this photograph of this poor crest plant that's been growing with no warmth.

Now, what do you think you could do to help a plant like this that's been growing with no warmth? Maybe your plant that you've been growing with no warmth.

Do you think it can become healthy again? What do you think? Get ready for me to check your understanding of this final part of the lesson.

True or false? A suitable temperature for most plants to grow indoors is 35 degrees Celsius.

Do you think that is true or do you think that is false? And the answer is false? Now, it's time to think of how do we know that? What information do we know to say, I think this because.

You might want to choose between these statements.

Most plants grow and stay healthy indoors at 22 degrees Celsius, or most plants grow and stay healthy indoors at 0 degrees Celsius.

Which one do you think? Yes, that's right.

Do you remember our thermometer? We are measuring up to around 22 degrees Celsius for a plant to grow and stay healthy indoors.

Well done.

Our next question, now we're thinking about Antarctica.

And why do you think very few plants grow at Antarctica? Is it because it is too hot for plants at Antarctica or is it too cold for plants at Antarctica, or is it too quiet for plants at Antarctica.

Yes, can you remember that Antarctica is the coldest place on Earth? It's too cold for plants at Antarctica.

Well done.

And now, your final practise tasks.

What do you think will happen to a plant you've been growing in a cold place? If you put it somewhere warm, it would be brilliant if you could draw a picture or write a description.

Come on.

Think about if you had a plant with no warmth that was unhealthy, that was wilting like this one in my investigation, what could you do to try to make it healthy again? If we gave it some warmth, what do you think would happen to it? Are you ready to have a go at that now? So get that plant that you've been growing in a cold place and put it somewhere where it's getting warmth.

And what I'd like you to do is, observe what happens over the next few days, maybe even the next few weeks.

It would be brilliant if you could talk about what happens with somebody else.

Okay, so here are some ideas of what we think might happen to the plant if we put it somewhere warm.

I think when A has stopped growing, it is dead.

It cannot be made healthy again.

Is that what you think? Do you have other ideas? Maybe you agree with this one.

I think that warmth will make the plant begin to grow tall and strong again.

Have a think about it and talk to somebody else about what you've decided.

It's time for us to think about what we've learned in the lesson today.

Plants are living things.

They need warmth to grow, stay alive, and keep healthy.

What else have we learned today? We know that plants without warmth can grow more slowly or maybe stop growing altogether.

And also that different plants grow in different temperatures around the world.

The final thing for you to do now is have a go at the Exit quiz.

All the very best with it, and I'll see you next time.