Hibernation and Estivation Characteristics

The video explains the differences between hibernation, winter sleep, torpor, and estivation. Hibernation involves a significant drop in metabolism and body temperature for weeks or months, common in small mammals. Winter sleep, seen in large mammals like bears, involves a moderate temperature drop and can be quickly reversed. Torpor is a daily cycle of reduced metabolism and temperature, while estivation occurs during dry periods, affecting invertebrates and reptiles. The video also discusses temperature changes and reactivation from these states.

Which of the following factors is NOT a basic difference between hibernation, winter sleep, torpor, and estivation?

• Type of food consumed

• Temperature changes

• Season of occurrence

• Duration of the state

What is a key characteristic of hibernation?

• Occurs only in large mammals

• Involves a significant drop in body temperature for weeks or months

• Happens daily with minimal temperature change

• Occurs during periods of drought

Which animals are most likely to experience winter sleep?

• Black bears and large mammals

• Rodents and bats

• Hummingbirds and small birds

• Crocodiles and amphibians

How does torpor differ from hibernation?

• Torpor occurs over weeks or months

• Torpor involves a daily decrease in metabolism

• Torpor is exclusive to large mammals

• Torpor occurs during summer only

Which of the following is true about estivation?

• It occurs only in winter

• It is a response to high rainfall

• It involves inactivity during dry periods

• It is common in large mammals

Which animals are known to undergo estivation?

• Rodents and bats

• Black bears

• Crocodiles and amphibians

• Hummingbirds

What is the typical temperature drop during hibernation?

• No temperature change

• Up to 2 degrees centigrade

• 5 to 6 degrees centigrade

• 10 degrees centigrade

How quickly can an organism reactivate from winter sleep?

• Very slowly, over several days

• Quickly, with a simple stimulus

• Only during summer

• Not at all, it remains inactive

What is a characteristic of torpor in terms of reactivation?

• Difficult to break

• Quick reactivation with a simple stimulus

• Requires a change in season

• Permanent state

Which of the following is NOT a common feature of estivation?

• Common in invertebrates

• Occurs during dry periods

• Significant temperature drop

• Involves inactivity