Metabolic Rate

Question 1

Why must you avoid splashing water when filling the consol jar with dechlorinated water?

Answer 1

• May aerate water = bubbles form in jar

- volume measurements = inaccurate if water splashed out of jar

Question 2

Why did you have to ensure that there were no air bubbles under the lid of the consol jar?

Answer 2

• air bubbles = add O2 to sample via gas diffusion -> skew results

Question 3

Why did you have to keep disturbance to a minimum?

Answer 3

• fish in resting and undisturbed environment

- stressed environment = changes BMR = uses excess O2 = render results of experiment inaccurate

Question 4

Were you calculating BMR or SMR of the goldfish?

Answer 4

BMR - basal metabolic rate

- the fish was undergoing minimal activity which is a characteristic of BMR

Question 5

Why is it necessary to continuously swirl the solution when titrating the thiosulphate solution?

Answer 5

• ensure entirely mixed & reacted quickly -> ensure endpoint not overshot