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Q.

Select the correct sequence of origin of molecules and living forms on the Earth.

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a

Organic molecules → inorganic molecules → noncellular organisms → cellular organisms

b

Inorganic molecules → organic molecules → cellular organisms → noncellular organisms

c

Inorganic molecules → organic molecules → noncellular organisms → cellular organisms

d

Inorganic molecules → noncellular organisms → organic molecules → cellular organisms

answer is C.

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Detailed Solution

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The correct sequence of origin of molecules and living form on the Earth is:

Inorganic molecules → organic molecules → noncellular organisms → cellular organisms

  • Inorganic Molecules: This stage involves the formation of simple inorganic molecules, such as water, carbon dioxide, methane, ammonia, and others, from the primordial Earth's abiotic (non-living) environment. These inorganic molecules provide the basic building blocks for more complex organic molecules.
  • Organic Molecules: In this stage, organic molecules, including amino acids, nucleotides, sugars, and various other organic compounds, are formed from the inorganic precursors. This can occur through processes like prebiotic chemistry, involving sources of energy like lightning, ultraviolet radiation, or volcanic activity. These organic molecules serve as the foundation for the development of life's essential biomolecules.
  • Noncellular Organisms (Prebiotic Chemistry): At this stage, the term "noncellular organisms" typically refers to complex chemical systems or protobionts that exhibit some lifelike properties but are not fully-fledged cells. These protobionts may have properties like self-replication, metabolism, and the ability to undergo simple chemical reactions. Lipid vesicles (protocells) and RNA molecules capable of self-replication are examples of structures that could represent this stage of abiogenesis.
  • Cellular Organisms: Finally, cellular life emerges. Cells are the fundamental units of life as we know it. These cellular organisms can be single-celled (like bacteria) or multicellular (like plants and animals). They possess complex biological structures, including membranes, genetic material (DNA or RNA), and the machinery necessary for growth, replication, and metabolism.
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