MCQ
Which of the following was present in primitive earth?
- AAmmonia and helium
- BJuvenile water vapour
- COxygen
- DHydrogen and methane
Explanation:
The primitive earth is thought to be highly reducing in nature due to the absence of oxygen. Hydrogen and methane predominated the atmosphere and caused the condensation of various biomolecules. This theory was forwarded by Oparin and Haldane which accounts for the chemical evolution of life.
It was proved by Urey and Miller through an experimental set-up that mimicked the primitive earth conditions and resulted in the formation of amino acids.
Hence, the correct answer is 'Hydrogen and methane'.
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$(1)$ Decomposition is largely an oxygen -requiring process.
$(2)$ Warm and moist environment slow down decomposition process.
$(3)$ Decomposition rate is slower if detritus is rich in lignin and chitin
$(4)$ Humus is colloidal in nature it serves as are servoir of nutrients.