In the atmosphere of the primitive earth there was no ________

A Oxygen
B Carbon dioxide
C Nitrogen
D Ammonia

Correct Answer: Oxygen

For decades, scientists believed that the atmosphere of early Earth was highly reduced, meaning that oxygen was greatly limited. By 2.7 billion years ago, a new kind of life had established itself: photosynthetic microbes called cyanobacteria, which were capable of using the Sun's energy to convert carbon dioxide and water into food with oxygen gas as a waste product.
Bissoy MCQ
#Geography #Atmosphere

Related Questions

পৃথিবী পৃষ্ঠে একটি ইটের ওজন 81 N. পৃথিবীর অর্ধেক বাসার্ধের সমান উচ্চতায় এবং অর্ধেক বাসার্ধের সমান গভীরতায় ইউটির উপরে পৃথিবীর অভিকর্ষ বলের মান কত হবে?(A brick weighs 81 N on the surface of the earth. What are the earth's gravitational forces act on it at a height of half of the radius of the earth and at a depth of half of the radius of earth, respectively?)
A 36 N and 81 N
B 36 N and 40.5 N
C 36 N and 20.25 N
D 98 and 40.5 N
E 81 N and 81 N
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
A Hydrogen
B Carbon dioxide
C Ozone
D None of these
Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
A Ionosphere
B Stratosphere
C Mesosphere
D Exosphere
How many Primitive data types are there in Java?
A 4
B 2
C 8
D 7
In the earliest days when life originated on earth, the atmosphere contained ________
A Free oxygen
B No oxygen
C Oxygen in fixed form
D Oxygen bound to carbon
The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is ________
A Troposphere, Stratosphere, Ionosphere, Mesosphere
B Stratosphere, Troposphere, Ionosphere, Mesosphere
C Troposphere, Stratosphere, Mesosphere, Ionosphere
D Stratosphere, Troposphere, Mesosphere, Ionosphere
In the earth's atmosphere, the atmospheric pressure ________
A Increases with height
B Decreases with height
C Remains constant with height
D First increases and then decreases with height
A body has a weight W on the surface of Earth. What is its weight on a planet whose mass is 15 times that of Earth and a radius that is 4 times that of the earth?
A 15\/4 W
B 16\/9 W
C 16\/7 W
D 16\/15 W
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
A granite
B basalt
C igneous rocks
D sedimentary rocks

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