1.Unidirectional changes in Earth\'s history include all of the following, excep

Question

1.Unidirectional changes in Earth's history include all of the following, except:

evolution of life

differentiation and formation of the core

the great oxygenation event

supercontinent formation

formation of continental crust

2.Which of the following is not a long-term sink for carbon in the carbon cycle?

limestone

atmospheric carbon dioxide

coal

organic shales

methane hydrates

3.For the Mesozoic Era (252 to 66 Ma), the average temperature on Earth:

was about as warm as present

was cooler than present

was warmer than present

was undergoing extreme fluctuations

is not possible to determine

evolution of life

differentiation and formation of the core

the great oxygenation event

supercontinent formation

formation of continental crust

Explanation / Answer

1) answer ) option d) supercontinent formation

Reason : all the processes given are unidirectional changes expect supercontinent formation since supercontinents form and later rift apart into smaller pieces. After that again convergence takes place and the continents collide and stick together.So, this is not an undirectional change in Earth's history

Q2) answer) option b) atmospheric carbon dioxide

Reason : atmospheric carbon dioxide is short-term sink for carbon in the Carbon cycle whereas limestone , coal , organic shales are long term carbon sink

Q3) answer) option d ) was undergoing extreme fluctuations

Reason : Since most of the land is constituted in the Pangaea supercontinent which was distant from the the oceans , the fluctuation of the temperatures were great

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