Abstract: Pisum sativum L. plants are well-adapted to grow in the areas with cool and humid climatic conditions of tropics, subtropics and temperate regions with temperature ranging from 7-30°C. These plants grow as inter annual, can tolerate frost to -20°C in the seedling stage. In Pisum sativum seeds the heat shock given at 45 and 50°C resulted in seedling growth retardation at room temperature but the heat shock was ameliorated by chilling treatment since in all experimentals (treatments at 35, 40, 45 and 50°C) seedlings exhibited uniform proliferated growth in cold condition. This quality of Pisum sativum seeds seems to be an ecological adaptation to growth at a wide range of temperature regime.