Plants and Water 2

In this worksheet students are able to plan an investigation into how much water a plant needs, to predict the outcome and to analyse the results.

Key stage:  KS 2

Curriculum topic:   Plants

Curriculum subtopic:   Transporting Water in Plants

Difficulty level:

QUESTION 1 of 10

Mrs. Bates's science class are going to carry out an investigation to try to find out how much water a bean seedling needs in order to grow into a healthy plant.

She has already prepared some beans which have germinated (or sprouted) and look like this:

Here is the bean seedling:

Can you match the label to its correct name?

Column B

A
seed
B
root
C
shoot

Mrs. Bates explains that each student will be given a seedling to keep in a yogurt pot with kitchen towel in. The seedlings will be given a certain amount of water each day.

She divides her class into five groups with each group giving a set amount of water to their seedlings each day.

Here are the amounts of water:

0cm3

25cm3

50cm3

75cm3

100cm3

Which amount of water do you predict will be best for healthy growth? (Just write the number)

Here are three ways in which the students could measure the correct volume of water to give their seedlings each day:

 5ml Measuring Spoon 100ml Measuring Cylinder 1L Measuring Jug

Which one do you think is best?

5ml measuring spoon

100ml measuring cylinder

1L measuring jug

The students will be measuring the length of their seedling using a ruler. Which of these lengths do you think would give the best measure of growth?

A

B

C

There are 30 students in Mrs. Bates's science class and 5 different amounts of water to test, so Mrs. Bates asks her class how many bean seedlings they should have for each different volume of water.

Charlie says: "more for the ones with lots of water."

Shannon says: "people should be allowed to choose the amount of water they want to give their seedling."

Katie says: "six seedlings for each one as it's fairer."

Who do you agree with scientifically?

Charlie

Shannon

Katie

Mrs. Bates asks her class how long the investigation should last for. Which of the following do you think they chose?

5 days

2 weeks

1 month

2 months

The students keep on adding the correct amount of water and measuring their seedlings each day.  They fill in a chart with their results as they go along.

At the end of the investigation Mrs. Bates asks them to work out how much their seedling had grown during that time. She helps them to draw a bar chart of their results:

Looking at their results, which amount of water seems best for the growth of bean seedlings?

0ml

25ml

50ml

75ml

100ml

Here's the graph again:

What do you think happened to the seedlings given 0cm3 of water each day? You can see that they ended up 2cm shorter than they started.

Select all of the correct answers:

They died

They grew very quickly

They shrivelled

They stayed the same size

They dried up

Why do you think the seedlings given 100cm3 of water each day only grew 1cm longer?

They drowned

They didn't have enough water

They didn't get enough air

Harry was in the group that were adding 25cm3 of water to their seedlings. Harry's seedling grew 7cm longer whereas all the other ones in his group only grew 3cm or so.

Why do you think this might have happened?

Harry didn't measure his water very carefully

Harry didn't measure his seedling properly

Harry's seedling was different to the others and grew well with less water

• Question 1

Here is the bean seedling:

Can you match the label to its correct name?

Column B

A
shoot
B
seed
C
root
EDDIE SAYS
The root appears first to anchor the seedling in the soil and to start drawing up water. Then the shoot appears from which the leaves will spread so that the seedling can begin to feed from the sunlight.
• Question 2

Mrs. Bates explains that each student will be given a seedling to keep in a yogurt pot with kitchen towel in. The seedlings will be given a certain amount of water each day.

She divides her class into five groups with each group giving a set amount of water to their seedlings each day.

Here are the amounts of water:

0cm3

25cm3

50cm3

75cm3

100cm3

Which amount of water do you predict will be best for healthy growth? (Just write the number)

0
25
50
75
100
EDDIE SAYS
To be honest your prediction is your prediction, so there isn't really a 'right' answer. Your prediction of what you think will happen is based on whatever knowledge you have about watering growing plants - you may well have no knowledge, so you're just taking your best guess.
• Question 3

Here are three ways in which the students could measure the correct volume of water to give their seedlings each day:

 5ml Measuring Spoon 100ml Measuring Cylinder 1L Measuring Jug

Which one do you think is best?

100ml measuring cylinder
EDDIE SAYS
The measuring cylinder is best for two reasons - it's the most accurate, so you can be sure that if you have to put in 50ml (50cm3) then you'll get the right amount. Also it'd take ages to measure that out with a 5ml spoon - 50ml is 10 spoonfuls! The 1L jug (1000ml) won't have enough markings up to 100ml (100cm3) to measure the volume of water accurately.
• Question 4

The students will be measuring the length of their seedling using a ruler. Which of these lengths do you think would give the best measure of growth?

A
EDDIE SAYS
The root and the shoot grow at different rates as the seedling grows, so measuring the length of the whole seedling is best (A). The measurement for C (the seed) will hardly change as that's what the seedling has grown out of.
• Question 5

There are 30 students in Mrs. Bates's science class and 5 different amounts of water to test, so Mrs. Bates asks her class how many bean seedlings they should have for each different volume of water.

Charlie says: "more for the ones with lots of water."

Shannon says: "people should be allowed to choose the amount of water they want to give their seedling."

Katie says: "six seedlings for each one as it's fairer."

Who do you agree with scientifically?

Katie
EDDIE SAYS
In a science investigation you want to get as much information as possible: there are 5 different volumes of water to test so you want as many students as possible testing each one. With 30 students that divides up equally into 6 students testing each volume of water (that's the most you can have).
• Question 6

Mrs. Bates asks her class how long the investigation should last for. Which of the following do you think they chose?

2 weeks
EDDIE SAYS
By the end of 2 weeks the class will have gathered enough data to know which volume of water gives the best results. 5 days is too short and after a month the seedling would be getting a bit too big to stay in the yogurt pot.
• Question 7

The students keep on adding the correct amount of water and measuring their seedlings each day.  They fill in a chart with their results as they go along.

At the end of the investigation Mrs. Bates asks them to work out how much their seedling had grown during that time. She helps them to draw a bar chart of their results:

Looking at their results, which amount of water seems best for the growth of bean seedlings?

50ml
EDDIE SAYS
The most growth in the seedlings was recorded by the students who had added 50ml of water. You can see that's the highest bar = 10cm growth.
• Question 8

Here's the graph again:

What do you think happened to the seedlings given 0cm3 of water each day? You can see that they ended up 2cm shorter than they started.

Select all of the correct answers:

They died
They shrivelled
They dried up
EDDIE SAYS
The unlucky bean seedlings given no water ended up shorter than they started. Without water the root dried up and turned brown and the seedling died.
• Question 9

Why do you think the seedlings given 100cm3 of water each day only grew 1cm longer?

They drowned
They didn't get enough air
EDDIE SAYS
Most plants like a certain amount of water and not too much; too much means that their roots begin to rot and they die. With seedlings, being underwater means that they cannot get the air they need to grow healthily and so they do not grow at all well.
• Question 10

Harry was in the group that were adding 25cm3 of water to their seedlings. Harry's seedling grew 7cm longer whereas all the other ones in his group only grew 3cm or so.

Why do you think this might have happened?

Harry's seedling was different to the others and grew well with less water
EDDIE SAYS
Remember that, like us, bean seedlings are all a little different. It may be true that Harry\'s measurements weren\'t as accurate as they could be, but the best explanation is that his seedling was different to the others and was able to cope with less water and still grow well. As the world\'s climate changes some places will become drier and plants will need to be individuals in order to have a chance of surviving there.
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