Watch the following video on the food chain and do the test at the end.Click here:
http://www.kidsknowit.com/interactive-educational-movies/free-online-movies.php?movie=Food%20Chains

This is a food-chain related game where you will practise the things you have learnt on the topic. Click here to play: http://www.bbc.co.uk/schools/scienceclips/ages/8_9/habitats.shtml

Try this one too! Click here: http://www.sheppardsoftware.com/content/animals/kidscorner/games/foodchaingame.htm