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Science Quiz - Investigating - Whose Plant Will Grow Best? (Questions)

Find out how to make a fair plant-growing test and discover whose plant really grows best by changing just one thing at a time.

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Fascinating Fact:

To make it fair in a “Whose plant will grow best?” test, we only change one thing, like how much water or where the pot is.

In KS1 Science, you learn to set up fair tests. When growing plants, scientists change just one thing and keep all other conditions the same to compare growth properly.

Key Terms

Fair test: An investigation where only one thing is changed so the results are honest and reliable.
Variable: The one thing you choose to change, such as water, light, or where the plant pot is.
Control: The things you keep the same, like pot size, type of seed, and amount of soil.

Frequently Asked Questions (Click to see answers)

How do you make a plant experiment fair for KS1?

To make a plant experiment fair, change only one variable, such as light or water, and keep everything else the same for all the plants you compare.

What could we change in a “Whose plant will grow best?” test?

You might change how much water a plant gets, where it is placed, or how much light it receives, but only one of these at a time.

Why do KS1 children learn about fair tests in science?

KS1 children learn about fair tests so they understand that science uses careful, honest methods to find answers, not guesses or mixed-up experiments.

Try These Related Quizzes

1.

Stella asks, ‘Do plants need sunlight to grow?’ She has two tomato plants. Where should she put them?

[ ]	One on a windowsill and one outside
[ ]	One on a windowsill and one in a cupboard
[ ]	One outside and one in a greenhouse
[ ]	One in a greenhouse and one on a windowsill

2.

Jack asks, ‘Do plants need water to grow?’ Jack has two tomato plants. What should he do?

[ ]	Keep both dry
[ ]	Water one plant but not the other
[ ]	Water both plants
[ ]	Water both plants only when they are dry

3.

Dylan asks, ‘Do plants grow towards the light?’ Dylan has two tomato plants. How can he test this?

[ ]	Put both plants on a sunny windowsill
[ ]	Put one plant in a dark cupboard, and one plant on a sunny windowsill
[ ]	Put both plants on a windowsill. Turn one plant every day, but not the other
[ ]	Put one plant in a greenhouse and one outside

4.

Sunil asks, ‘Do plants grow better when it is warm?’ Sunil has two tomato plants. What should Sunil do?

[ ]	Grow both plants on a windowsill. One plant above a radiator, and the other away from the radiator
[ ]	Grow both plants on a windowsill. Put both plants above the radiator
[ ]	Grow one plant in a dark cupboard and one plant on a windowsill
[ ]	Grow both plants in a greenhouse where it is warm

5.

Alex asks, ‘Does the light have to come from the sun?’ What should Alex do with his two tomato plants?

[ ]	Shine a torch on the plants
[ ]	Grow both of them in the classroom
[ ]	Put one on a sunny windowsill. Put the other one under a lamp
[ ]	Put one on a sunny windowsill. Put the other one in a greenhouse

6.

Ellie watered her two tomato plants every day. But they stopped growing and died. Ellie was upset. What had Ellie done wrong?

[ ]	Ellie had watered both tomato plants
[ ]	Ellie had only watered them once a day
[ ]	Ellie had given the tomato plants too much water
[ ]	Ellie forgot to water them one day

7.

Katie wanted to find out what type of soil tomato plants like best. Katie had three tomato plants. She planted one in compost, one in stony soil, and one in sandy soil. What should she do then?

[ ]	Put one in a sunny place, one in a cool place, and one in a dark place
[ ]	Put all three in a sunny place
[ ]	Put two of them in a sunny place, and one in a dark place
[ ]	Put all three in a dark place

8.

Lucy asked, ‘What is the biggest tomato I can grow?’ She had one tomato plant. She looked after it really well. It had twelve tomatoes on it. They all ripened and went red. How did she find out which was the biggest tomato?

[ ]	Lucy ate the tomatoes
[ ]	Lucy looked at the tomatoes
[ ]	Lucy weighed the tomatoes
[ ]	Lucy used a magnifying glass

9.

Chloe grew her tomato plants outside. They had yellow flowers. What did Chloe see around the flowers?

[ ]	Woodlice
[ ]	Bees
[ ]	Snails
[ ]	Ladybirds

10.

Maria’s Mum was frying tomatoes. She asked Maria, ‘What do tomatoes need to grow?’ What did Maria say?

[ ]	Light
[ ]	Water
[ ]	Warmth
[ ]	Light, water and warmth

You can find more about this topic by visiting BBC Bitesize - Working scientifically

Science Quiz - Investigating - Whose Plant Will Grow Best? (Answers)

1.

Stella asks, ‘Do plants need sunlight to grow?’ She has two tomato plants. Where should she put them?

[ ]	One on a windowsill and one outside
[x]	One on a windowsill and one in a cupboard
[ ]	One outside and one in a greenhouse
[ ]	One in a greenhouse and one on a windowsill

Which one do you think will grow best?

2.

Jack asks, ‘Do plants need water to grow?’ Jack has two tomato plants. What should he do?

[ ]	Keep both dry
[x]	Water one plant but not the other
[ ]	Water both plants
[ ]	Water both plants only when they are dry

Which plant, do you think, will grow?

3.

Dylan asks, ‘Do plants grow towards the light?’ Dylan has two tomato plants. How can he test this?

[ ]	Put both plants on a sunny windowsill
[ ]	Put one plant in a dark cupboard, and one plant on a sunny windowsill
[x]	Put both plants on a windowsill. Turn one plant every day, but not the other
[ ]	Put one plant in a greenhouse and one outside

Why do plants like to grow towards the light?

4.

Sunil asks, ‘Do plants grow better when it is warm?’ Sunil has two tomato plants. What should Sunil do?

[x]	Grow both plants on a windowsill. One plant above a radiator, and the other away from the radiator
[ ]	Grow both plants on a windowsill. Put both plants above the radiator
[ ]	Grow one plant in a dark cupboard and one plant on a windowsill
[ ]	Grow both plants in a greenhouse where it is warm

What happens, do you think, if plants get too hot?

5.

Alex asks, ‘Does the light have to come from the sun?’ What should Alex do with his two tomato plants?

[ ]	Shine a torch on the plants
[ ]	Grow both of them in the classroom
[x]	Put one on a sunny windowsill. Put the other one under a lamp
[ ]	Put one on a sunny windowsill. Put the other one in a greenhouse

What do plants need to make their own food?

6.

Ellie watered her two tomato plants every day. But they stopped growing and died. Ellie was upset. What had Ellie done wrong?

[ ]	Ellie had watered both tomato plants
[ ]	Ellie had only watered them once a day
[x]	Ellie had given the tomato plants too much water
[ ]	Ellie forgot to water them one day

Plants need water, but they can have too much

7.

Katie wanted to find out what type of soil tomato plants like best. Katie had three tomato plants. She planted one in compost, one in stony soil, and one in sandy soil. What should she do then?

[ ]	Put one in a sunny place, one in a cool place, and one in a dark place
[x]	Put all three in a sunny place
[ ]	Put two of them in a sunny place, and one in a dark place
[ ]	Put all three in a dark place

Katie must also give all three plants the same amount of water

8.

Lucy asked, ‘What is the biggest tomato I can grow?’ She had one tomato plant. She looked after it really well. It had twelve tomatoes on it. They all ripened and went red. How did she find out which was the biggest tomato?

[ ]	Lucy ate the tomatoes
[ ]	Lucy looked at the tomatoes
[x]	Lucy weighed the tomatoes
[ ]	Lucy used a magnifying glass

What did Lucy use to weigh the tomatoes?

9.

Chloe grew her tomato plants outside. They had yellow flowers. What did Chloe see around the flowers?

[ ]	Woodlice
[x]	Bees
[ ]	Snails
[ ]	Ladybirds

Why are the flowers a bright yellow colour?

10.

Maria’s Mum was frying tomatoes. She asked Maria, ‘What do tomatoes need to grow?’ What did Maria say?

[ ]	Light
[ ]	Water
[ ]	Warmth
[x]	Light, water and warmth

What do you need to grow?