- Slides: 20
Any one in here eaten lettuce?
Anyone in here found a ‘creepycrawly’ on the lettuce? Maybe a slug?
…. or…. A snail?
…. or…. greenfly (aphid)?
…. . or maybe…. …. just soil ? ? …. . JUST soil ? ?
Listeria • Listeria is a a type of food poisoning. • The germs that cause it are found in the soil. • It can be very dangerous to pregnant women, babies and old people.
• Most people try to keep food fresh by putting it in the fridge, BUT Listeria germs are unusual in that they will happily grow even at cool temperatures.
LETTUCE EATERS ANONYMOUS
FOOD HYGIENE From 1 January 2006, food hygiene legislation has applied to farmers, growers and other producers, in many cases for the first time, as part of the 'farm to fork' approach to food safety.
Hydroponics What is the advantage of growing lettuce like this?
What would the lettuce plants need? CO 2
These plants have been grown in different mineral solutions. Can you spot any differences between these plants? Write down a list of what you could record.
Observation Skills What’s the same? What can you measure? What’s different?
• • • Tube 1 – Complete culture solution Tube 2 – Without Nitrogen Tube 3 – Without Phosphorus Tube 4 – Without Potassium Tube 5 – Distilled water (Control)
Planning time! • Draw a diagram of what you plan to set up. • Write a list of the apparatus you will need. • Write a detailed plan to say how you will set up the experiment. • Draw a table ready for the results that you are going to record. (HINT! – will you only record the results from your own experiment ? – or will you need to record results from other people’s experiment as well? Why? )