For every 10 degrees C rise in temperature, metabolic rate approximately doubles. Plant Responses to Temperature Temperature extremes endured by plants Heat Stress Photosynthetic responses of different species or races within a species has a genetic component. The ability of plants to tolerate cold temperatures has a genetic component. Poikilotherm Homeotherm Poikilotherms Rely upon behavioral mechanisms to regulate body temperature.
Poikilotherms allocate more energy to biomass production than to metabolism.
In most ectotherms, the developmental rate is closely linked to temperature. So they require 70 day-degrees above threshold. Design an experiment that would provide the data to determine day-degrees for an ectotherm. The rate of heating and cooling in poikilotherms decreases as body size increases. Most acquatic poikilotherms generally encounter temperature fluctuations of lesser magnitude and usually have poorly developed thermoregulatory capabilities than terrestrial forms.