Question

1. a. Which of the following statements about the Thermoneutral Zone (TNZ) is TRUE?

		The TNZ is when the animals body temperature is the lowest.
		Animals need to eat the least amount of food in their TNZ.
		Both endotherms and ectotherms have a TNZ.
		This is the environmental temperature where the animal can move the fastest.
		Animals need to increase their metabolism to maintain their TNZ.

b) Marine osmoregulators perform which of the following processes to survive in a salt-water environment?

		Maintain high levels of cellular respiration, in order to generate enough “metabolic water” to replenish internal water stores.
		Drink very little sea water, and constantly excrete very dilute urine to counterbalance the constant influx of water from osmosis.
		Perform anhydrobiosis, in which the animal periodically enters into dormant states to conserve water and survive desiccation.
		Constantly drink large amounts of sea water, and expend energy to actively transport large amounts of extra salt out of their body.
		Evolve internal body osmolarities that are isosmotic to the salt concentrations in the surrounding sea water.

Answer 1

1) Animal need to eat the least amount of food in their TNZ as body temp of animal is near or equal to ambient temperature so that animal have to spend least amount of energy to maintain homeostasis. So least amount of food is needed in the TNZ ZONE.

2) constantly drink large amount of sea water , and expend energy to actively transport large amount of extra salt out of their body.