1 Which animal achieves the highest weightspecific rate of O

1.) Which animal achieves the highest weight-specific rate of O2 consumption?

a.) salamander

b.) bird

c.) lizard

d.) worm

2.) Which of these is the most direct measure of metabolic rate in an animal?

a.) Measuring the oxygen consumption in grams per minute.

b.) Measuring the amount of heat produced by the animal during a specific period.

c.) Determining how many calories of food the animal consumes over a given time period.

d.) Observing the activities of an animal over the course of a day.

Solution

1) The highest weight-specific rate of O2 consumption is acheived by a worm. Larger animals usually uptake more O₂ per hour than smaller animals.But, an animal that is twice as big cannot consume twice as much oxygen. Generally, bigger animal use less O₂ per kilogram of body weight. Therefore, the highest weight specific rate of O₂ is observed in small organism like worm. Option d is correct.

2)

The direct measure of metabolic rate of an animal is measuring the amount of oxygen consumed in grams per minute and this is related to the amount of heat produced. Metabolic rate is measured by three distinct measures: 1. determination of energy differences in foods consumes and waste excreted. 2. Total heat produced by animal and is measured with a calorimeter. 3. Measuring the amount of O₂ consumed which is directly proportional to amonut of O₂ consumed in aerobic metabolism. Option a is correct.