What happened to present in the primary atmosphere during its conversion to the secondary atmosphere?
It got oxidized to and water
It was absorbed by photoautotrophs
Most of it got oxidized to nitrogen oxides
It concentration was decreased due to formation
Related Questions
Birbal Sahni was
Palaeobotanist
Zoologist
Ornithologist
Palaeozoologist
The concept that the species have changed over a long period of time is know as
Ecosystem
Spontaneous generation
Organic evolution
Genetic recombination
Which of the following was formed in S Miller’s experiment?
Amino acids
Nucleic acids
UV radiations
Microspheres
Abiogenesis first, but biogenesis ever since was said by
Louis Pasteur
Charles Darwin
Alexander Oparin
Stanley Miller
Which units are used to measure the stellar distances
Metres
Light years
Oparin and Haldane’s theory is also called
Chemical theory of origin of life
Modern theory of origin of life
Naturalistic theory
All of the above
Life appeared ________ years after the formation of earth
4.5 billion
1 billion
500 million
2 billion
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
Methane
Oxygen
Hydrogen
Water vapour
The gases condensed under …A… and formed the galaxies of the present day universe. In the solar system of the milky way galaxy, earth was supposed to have been formed about …B… back. There was no atmosphere …C… on the earth. Water vapour, …D… carbon dioxide and ammonia released from molten mass covered the surface.
Choose the correct option for A, B, C and D to complete the given paragraph with reference to NCERT textbook
A-Gravitation, B-4.5 billion years, C-Early, D-Methane
A-Acceleration, B-4.5 billion years, C-Early, D-Methane
A-Acceleration, B-4.5 billion years, C-Early, D-Ethane
A-Gravitation, B-4.5 billion years, C-Early, D-Ethane
Which of the following molecules falls under the category of eobionts?
I. Coacervates II. Microspheres
I only
II only
Both I and II
Neither I nor II
