Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.2 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.7 cm and is 0.20 mm thick.

What is the resistivity of the leaf tissue? ρ =

Is this greater than or less than the resistivity of muscle tissue in the human body?