Homeostasis and Animal Nutrition

What are two examples of how plants regulate their temperature?

Why do plants regulate their temperature?

How would you expect the activity levels of poikilotherms to vary with increasing external temperature?

• Increased

• Decreased

Answer explanation

Poikiliotherm body temp varies depending on environment (they are conformers). They will most likely reduce activity levels when the environment is hot in order to reduce body temperature.

What are 3 examples of surface adaptations in animals to improve insulation?

True or false: Vasodilation conserves heat in an animal

• True

• False

Answer explanation

Vasodilation – relaxation of vascular system to allow increased blood flow to the extremities & cool the organism

Vasoconstriction - constriction of vascular system to reduce blood flow to the extremities and conserve heat

Is this a concurrent flow or a countercurrent flow?

• Concurrent

• Countercurrent

In an animal extremity (e.g. fin), arteries ___ blood, veins ___ blood

• Return; Import

• Import; Return

Which is NOT an example of evaporative cooling?

• Elephant washing itself with water on a hot day

• Human sweating after exercise

• Wind cooling off a giraffe in a dry environment

• Dog panting after chasing a rabbit

Answer explanation

if the giraffe is dry, this is an example of convection and not evaporative cooling

True or false: Torpor can be over a short or a long period of time

• True

• False

Label the different methods of heat exchange (can use abbreviations)