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I believe that some plants produce as much heat for their weight as birds do which are the greatest heat producers of all It is even harder to believe that some are able to thermoregulate which means that they actually alter their heat production to keep their temperature constant in fluctuating air temperatures This is similar to what mammals do The article I am reviewing tells about few a plants that do this and how they do it There are only three plants which have yet been shown to regulate their temperature They are the Philodendron selloun the Skunk Cabbage and the Sacred Lotus The most extensive testing has been done on the P selloun The earliest testing aimed to do little more than determine whether the inflorescence actually had become hot In the experiment spadices were impaled with temperature probes into the plant and the probes were connected to a machine that recorded the temperature continuously During the measurement period the temperature outside averaged 20 degrees Celsius and the temperature in the plant remained 20 degrees higher This proved that the inflorescence was hotter than its environment The next experiment aimed to show the range of the P sellouns heat producing capabilities Some specimens were cut and put into indoor cabinets where the temperature could be varied The reason the plants were placed in indoor cabinets was so that the plants rate of heat production could be measured by the expedient of measuring its rate of consumption of oxygen Then the inflorescences were examined at air temperatures from low freezing to temperatures that are uncomfortably hot for humans At the coldest extremes some of the inflorescences could not heat up at all But their temperatures went to as high as 38 degrees Celsius when the environment temperature was still 4 degrees C The cuttings became hotter as the air temperature rose further The inflorescences peaked at 46 degrees C when the inside of the
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