Grow: Classroom presentation

In this investigation

We know that plants need light and water to grow. That's what we're going to investigating! We’ll develop our investigative skills and gather evidence through doing things and taking note of what happens.

Hacker visits the Heavy Onion Championship

Watch our intrepid scientific investigator as he visits the National Heavy Onion Championship. With help from top scientist Maggie Aderin-Pocock, can he grow a prize winner? Watch the film and see if he knows his onions.

Hacker visits the Heavy Onion Championship

How do temperature and light affect growth?

To help answer this, we will take a range of measurements over an eleven day period.

Here is what you'll be doing:

1. Work in groups.

2. Trim the roots of the spring onions to 1.5cm.

3. Measure and cut spring onions so they are 4.5 cm long and then put them in a cup filled with 30ml of water outside.

4. Take daily measurements of the onions' length and also the temperature in the local area.

5. At the end of the eleven days, you will do some calculations and record the average mean temp and the mean height of the classes' spring onions.

You can then analyse your results to see if you can see any patterns and relationships between temperature and light level and the growth of your onion.

A cartoon image of a boy diggingBBC

Watch: How to do the Grow investigation

This step-by-step film explains how to carry out the Grow investigation at your school.

This step-by-step film explains how to carry out the Grow investigation at your school.
Grow - Teaching resources
Grow - investigations additional resources
Grow - Special Educational Needs and Disability resources