Temperature, light intensity, air currents, and humidity are some of these factors. Different plants also vary in the rate of transpiration and in the regulation of stomatal opening. In this lab, you will measure transpiration under various laboratory conditions using a potometer.ater will then move into the mesophyll cells by osmosis from surrounding cells with high water potentials, including the xylem. As each water molecule moves into a mesophyll cell, it exerts a pull on the column of water molecules existing in the xylem all the way from the leaves to the roots.
A starter solenoid (or starter relay) is the part of an automobile which switches a large electric current to the starter motor, in response to a small control current, and which in turn sets the engine in motion.hen low-current power from the starting battery is applied to the starter solenoid, usually through a key-operated switch, the solenoid closes high-current contacts for the starter motor and it starts to run.
Or you could take a volt meter and go from ground to the starter side of the solenoid and get some one to take the key and try to start it ,if you get 12volts and the starter doesn't try to engage then your starter is bad ,if you don't get 12volts then your solenoid is bad. A single click when you try to start the vehicle is usually indicative of a faulty starter relay/solenoid. Or possibly just a loose cable.   A rapid clicking sound is usually caused by a low battery. Could also be caused by a loose cale.