Respiration Rate Calculations Flashcards

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What does the term "respiration rate" mean in biology?

It is how fast respiration happens, usually measured by how much oxygen is used or carbon dioxide is made in a certain time.

What simple formula do you use to calculate respiration rate from experiment results?

Respiration rate = amount of gas used or made ÷ time taken.

In an experiment a seed uses 25 cm³ of oxygen in 5 minutes. What is its respiration rate?

Respiration rate = 25 ÷ 5 = 5 cm³ per minute.

What units are often used for respiration rate when measuring oxygen uptake?

cm³ of oxygen per minute, written as cm³/min, or cm³ of oxygen per gram per minute, written as cm³/g/min.

How do you work out respiration rate per gram of organism?

First find the respiration rate, then divide this rate by the mass in grams: rate per gram = respiration rate ÷ mass.

A small animal respires at 4 cm³/min. How much oxygen will it use in 10 minutes?

Amount of oxygen = rate × time = 4 × 10 = 40 cm³ of oxygen.

You repeat an experiment and get respiration rates of 3, 4 and 5 cm³/min. How do you calculate the mean respiration rate?

Add the rates and divide by 3: (3 + 4 + 5) ÷ 3 = 4 cm³/min.

On a graph of oxygen used against time, what does a steeper line tell you about respiration rate?

A steeper line means oxygen is used up faster, so the respiration rate is higher.

At 15 °C seeds respire at 2 cm³/min. At 25 °C they respire at 6 cm³/min. How many times faster is respiration at 25 °C?

6 ÷ 2 = 3, so respiration is three times faster at 25 °C.