Question

If animals that are normally seasonal are kept in a laboratory and receive no information about changes in day length or temperature (i.e. housed in constant dark), their circannual rhythms will
become free-running

Answer 1

The correct option is B ; become free running , If animals that are normally seasonal are kept in a laboratory and receive no information about changes in day length or temperature become free running .

The circadian rhythm typically consists of a 24-hour cycle for most people. Some people's endogenous or natural rhythms, however, do not correspond to this 24-hour period.

For instance, those who are blind and unable to distinguish between natural and artificial light frequently experience free-running sleep patterns.

The typical effects of exposure to heat or cold are an increase in wakefulness and a decrease in slow wave and rapid eye movement sleep. Thermoregulation, which affects the mechanism regulating sleep, is strongly correlated with these effects of the thermal environment on sleep stages.

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Full Question

If animals that are normally seasonal are kept in a laboratory and receive no information about changes in day length or temperature (i.e. housed in constant dark), their circannual rhythms will

a. persist, with a period of 365 days.

b. become free-running.

c. disappear.

d. persist, but only in females.