The immune system is the body's defense against infectious organisms and other invaders. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade body systems and cause disease.
When the humidity is high it feels oppressive outside because sweat doesn't evaporate and provide cooling. When the humidity is low you feel cooler, but your skin dries out and you get dehydrated more easily because more moisture is being evaporated from your body. The same thing applies to crops in high and low humidity. A high water vapor content is necessary to produce clouds and precipitation.
AIR AND TEMPERATURE. Temperature, movement, humidity and content of the air all affect plant growth. Unlike warm-blooded animals, which can function regardless of the outside temperature, plants rate of metabolism, how fast they function and grow is controlled by the temperature of the surrounding air.arijuana functions best at a humidity of 40-65%. Higher humidity causes problems in two ways. First, fungi which attack marijuana become active at higher humidities. They affect all parts of the plant, but especially the buds, which contain moisture holding crevices, are dark and have little air movement.