Question

Partial regulators are the organisms who.
a. Can regulate their body temperature to a large extent of the environment condition.
b. Can regulate their body temperature to a certain level of ambient temperature but if the temperature goes on increasing they can maintain a steady temperature
c. Can regulate their body temperature voluntarily
d. None of the above

Answer 1

Due to the tiny size of organisms of this type they can certainly not be found in Polar Regions. The organisms not falling in the class of conformers or regulators fall in the partial regulator's category.

Complete answer:
These organisms can tolerate a slight range of temperature changes. They are able to maintain constant body temperature when the ambient temperature continues to increase. Some marine animals are partial regulators and even some of the birds and also mammals which are small in size act as partial regulators

So, the correct answer is (B) 'Change their body temperature to a certain level of ambient temperature but if the temperature goes on increasing they can maintain a steady temperature'.

Additional information:

Conformers’ inner environment depends on the external environment. Regulators run their internal environment through their metabolism. Both must control their temperature to maintain the best possible metabolic rate.

Regulators can withstand differences in their external environment because they can control their internal environment.

This allows regulators to boost the possible ecological niches that they can inhabit. However, this regulation requires energy, so regulators will in general have high metabolic rates.

The regulation of the internal environment is called homeostasis. This practice requires a lot of energy and it is imperative because it provides enzymes in the body with an optimum temperature at which to work.

Note: There are a lot of animals, especially marine, which can bear changes in temperature, pH, salt concentration, etc. to changing limits but die after a verge is crossed.
However, warm-blooded animals like birds and mammals are usually regulators but this acts as another key factor of size. If these animals are miniature, i.e. high surface area to volume ratio, then they tend to lose more heat. Thus they can regulate till a certain end and then confirm. E.g. Shrew.