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Water Recycling

Measurement o...

Question

Measurement of the rate of oxygen consumption in unit volume of water over a period of time is done to find out

A

Biogas generation

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B

Biological oxygen demand

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C

Biosynthetic pathways

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D

Fermentation

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Solution

The correct option is B Biological oxygen demand
Decomposition of organic matter by microbes requires oxygen. Degree of impurity of water due to organic matter is measured in terms of 'Biological Oxygen Demand (BOD)'. BOD is the oxygen in milligrams required for 5 days in 1 litre of water at 20 degree centigrades for the microorganisms to metabolise organic wastes.

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Q. In a basal metabolism measurement timed at 6 minutes, a patient exhaled

52.5 L

of air measured over water at

20

. The vapour pressure of water at

20^{\circ} C

17.5 t o r r

. the barometric pressure was

750 t o r r

. The exhaled air analyzed

16.75

volume % oxyegen and the inhald air

20.32

volume % oxygen. Both on a dry basis neglecting any solubility of the gases in water and any difference in the total volumes of inhaled and exhaled air, calculate the rate of oxygen consumption by the patient in

m L

(STP) per minute.

Q. When we run fast, we consume more oxygen. Each one of us has a maximum rate of oxygen consumption. Our bodies cannot consume more oxygen than this. A scientist conducted a study of the maximum rates of oxygen consumption per kilogram body weight in 4 athletes. He also studied how much time each of them took to run a 10 km race. The result is shown in the table.

ATHLETE	MAXIMUM RATE OF OXYGEN CONSUMPTION (mL per kg per min)	TIME TO RUN 10 km RACE (min)
A1	65.5	33.2
A2	70.3	31.5
A3	55.8	38.1
A4	75.1	28.3

Answer these questions.
1. Is there a relationship between the maximum rate of oxygen consumption and time taken to run 10 km?
2. Can you suggest an explanation for this relationship?

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