What are three adaptations of plants that help reduce water loss in a desert or cold environment?

There are a variety of mechanisms- Many of the small mammals have special adaptations, such as convoluted nasal cavities and highly concentrated urine which conserves water- Many live underground, and so escape the heat of the day, and also underground is a more humid environment, so this also conserves water- Small mammals and other animals have less trouble coping with heat, because they are small, and so have a large surface area to radiate heat. The majority of activity occurs at night, so again escaping the heat...in desert climates, because the air is dry, there is significant cooling in the evening due to the fact that the air has a low heat capacity...in tropical climates heat is not as great a problem because there is plenty of water-the main way that animals cool themselves. Keep in mind, humid heat is only especially bad for humans and other sweating animals which cool themselves by evaporation. IN the absence of evaporative cooling, humidity doesn't have the same overheating effect as in humans. So, essentially it's a combination of staying underground and out of the heat of the sun during the day, and conserving water balance. IN addition, most of these animals can reduce their metabolism, thus decreasing internally generated heat.

United Nations Farms