BELL JAR EXPERIMENT    In the early 1770s, Joseph Priestley conducted a series of experiments that led to the discovery of the intimate relationship between plant and animal life.    In his principal experiment, Priestley placed a mouse within a sealed jar and observed it to eventually perish (a and b). When repeated with sprigs of mint within the jar, neither did the mouse die “nor was it at all inconvenient to a mouse” (c and d).   He had made the breakthrough that plants produce a substance which is life-giving to animals and then went on to describe it “dephlogisticated air”, which, thanks to the French chemist Antoine Lavoisier, soon became known as “oxygen”.

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Plant sensory system

The plant sensory system is a sophisticated system that responds to environmental stimuli such as light,temperature, gravity, and touch. Research predicts that plant hormones and signaling mechanisms areresponsible for this regulation system in plants.