Plants
click this link to go to the above activity:
http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/science/s_plants/index.htm
Now solve this mystery: http://urbanext.illinois.edu/gpe/case1/c1m1a.html
Sound
Do you know that sounds are generated in different ways and they vary in tone and loudness. The quiz can help you with the vocabulary you need to describe sounds.
http://www.bbc.co.uk/schools/scienceclips/ages/5_6/sound_hearing_fs.shtml