11
Question
Which of the following statements are correct?
I. Liberation of oxygen from water took place by the action of UV rays from the sun.
II. Free oxygen combined with methane and ammonia to form water, carbon dioxide and other gases.
III. It is believed that life appeared 500 million years after formation of earth.
Which of the following statements are correct?
I. Liberation of oxygen from water took place by the action of UV rays from the sun.
II. Free oxygen combined with methane and ammonia to form water, carbon dioxide and other gases.
III. It is believed that life appeared 500 million years after formation of earth.
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Solution
The correct option is B All three of them
Earth originated about 4.5 billion years ago.
The conditions of the primitive earth are as follows:
a. The primitive atmosphere on earth contained gases like ammonia, methane, and water vapour.
b. The ultraviolet radiation from the sun broke water into oxygen and hydrogen.
c. Hydrogen gas being lighter, escaped.
d. The oxygen released quickly reacted with methane and ammonia forming water, carbon dioxide and other gases.
e. The ozone layer was formed.
f. As temperature on the earth came down, the water vapour fell as rain, to fill all the depressions and thus, oceans were formed.
It is believed that life appreared 500 million years after the formation of earth.
Various theories were proposed to explain the origin of life on the earth. The Oparin-Haldane hypothesis is widely accepted to understand the origin of life on the earth.
So, the statements I, II and III are correct.
Earth originated about 4.5 billion years ago.
The conditions of the primitive earth are as follows:
a. The primitive atmosphere on earth contained gases like ammonia, methane, and water vapour.
b. The ultraviolet radiation from the sun broke water into oxygen and hydrogen.
c. Hydrogen gas being lighter, escaped.
d. The oxygen released quickly reacted with methane and ammonia forming water, carbon dioxide and other gases.
e. The ozone layer was formed.
f. As temperature on the earth came down, the water vapour fell as rain, to fill all the depressions and thus, oceans were formed.
It is believed that life appreared 500 million years after the formation of earth.
Various theories were proposed to explain the origin of life on the earth. The Oparin-Haldane hypothesis is widely accepted to understand the origin of life on the earth.
So, the statements I, II and III are correct.
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