Question

Many animals use the diurnal and seasonal variations in light intensity and photoperiod to time their

• A. Migration
• B. Reproductive activities
• C. Suspension
• D. All of these

Answer 1

Answer: (D)

All of these

Animals use seasonal variations in light intensity and photo period to time various activities. Birds of colder areas of Northern Hemisphere begin their Southward migration as the day lengths being to shorten. Reverse journey is undertaken with the increase in day length. Turkeys, ferrets and starlings greed in response to lengthening of days while goat, sheep and deer breed in response to shortening of days. Rabbits and guinea pig are day neutral.In temperate and subtropical areas, cold blooded or ectothermic animals undertake hibernation as the day tenth begins to shorten.

So, the correct answer is 'All of the above'.