1
Question
Read the following statements and select the correct option.
Statement 1: Miller runs his experiment for six days continuously.
Statement 2: The spark produced with the help of electrodes in Miller’s experiment simulates volcanic eruptions and thunderstorms in early Earth conditions.
Read the following statements and select the correct option.
Statement 1: Miller runs his experiment for six days continuously.
Statement 2: The spark produced with the help of electrodes in Miller’s experiment simulates volcanic eruptions and thunderstorms in early Earth conditions.
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Solution
The correct option is C Statement 2 is correct while statement 1 is incorrect
In 1953 Miller and Urey performed an experiment popularly known as Miller’s experiment and proved the modern theory of origin of life by Oparin and Haldane.
Figure : Miller and Urey's experimental setup
Miller took a mixture of water vapour, methane, ammonia and hydrogen gas, in a spark chamber. He inserted two electrodes to provide electrical discharge to maintain temperature of about 800°C in the spark chamber. The spark chamber was connected to another flask with arrangement for boiling water (provision for evaporation). The other end of the spark chamber was connected to a trap by a tube that passed through a condenser. Condenser is required for the condensation and collection of aqueous solution equivalent to rain (primitive ocean water). The trap was connected with the flask, for boiling water (for continuous circulation of water).
With the help of the above glass apparatus, they created early Earth conditions in the lab, where boiling water represented the ocean, gas chamber represented an early atmosphere (with methane, ammonia, and hydrogen in the ratio of 2:2:1), and electric spark represented the volcanic eruptions, thunderstorm and lightning. Hence statement 2 is correct.
They ran this experiment continuously for seven days. During this duration, the colour of water in the chamber changed to brown-black. After a detailed analysis of this sample, they confirmed the presence of simple amino acids and aldehydes in the water. Hence statement 1 is incorrect.
In 1953 Miller and Urey performed an experiment popularly known as Miller’s experiment and proved the modern theory of origin of life by Oparin and Haldane.
Figure : Miller and Urey's experimental setup
Miller took a mixture of water vapour, methane, ammonia and hydrogen gas, in a spark chamber. He inserted two electrodes to provide electrical discharge to maintain temperature of about 800°C in the spark chamber. The spark chamber was connected to another flask with arrangement for boiling water (provision for evaporation). The other end of the spark chamber was connected to a trap by a tube that passed through a condenser. Condenser is required for the condensation and collection of aqueous solution equivalent to rain (primitive ocean water). The trap was connected with the flask, for boiling water (for continuous circulation of water).
With the help of the above glass apparatus, they created early Earth conditions in the lab, where boiling water represented the ocean, gas chamber represented an early atmosphere (with methane, ammonia, and hydrogen in the ratio of 2:2:1), and electric spark represented the volcanic eruptions, thunderstorm and lightning. Hence statement 2 is correct.
They ran this experiment continuously for seven days. During this duration, the colour of water in the chamber changed to brown-black. After a detailed analysis of this sample, they confirmed the presence of simple amino acids and aldehydes in the water. Hence statement 1 is incorrect.
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