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Investigating - Whose Plant Will Grow Best?
Plants need light, warmth and water so that they can grow.

Investigating - Whose Plant Will Grow Best?

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.

  • 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.
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.

1 .
Chloe grew her tomato plants outside. They had yellow flowers. What did Chloe see around the flowers?
Woodlice
Bees
Snails
Ladybirds
Why are the flowers a bright yellow colour?
2 .
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
Plants need water, but they can have too much
3 .
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
What do you need to grow?
4 .
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
Which one do you think will grow best?
5 .
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
Which plant, do you think, will grow?
6 .
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
What did Lucy use to weigh the tomatoes?
7 .
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
What do plants need to make their own food?
8 .
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
Why do plants like to grow towards the light?
9 .
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
Katie must also give all three plants the same amount of water
10 .
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
What happens, do you think, if plants get too hot?
You can find more about this topic by visiting BBC Bitesize - Working scientifically

Author:  David Bland (Former Physics Teacher, KS1 Science & Geography Quiz Writer)

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