Wenger's side finally managed to apply some pressure, but found Chelsea's defence in resilient mood as Cole made a superb saving tackle as Samir Nasri shaped to shoot and Cech saved well from Fabregas' low free-kick.
For her experiment she studied the inheritance of three traits: a maroon coloured leaf marking, a white V-shaped leaf mark pattern, and the production of hydrogen cyanide in damaged leaves, which is thought to be a defence against predators.