Living and non-living organisms can be differentiated unexceptionally on the basis of

The correct option is Reproduction.

To understand why reproduction is the correct choice for differentiating living organisms from non-living objects, let us analyze the options step-by-step:
1. Growth: Growth is defined as an increase in mass and size. However, non-living things can also grow. For example, mountains, boulders, and sand dunes increase in size due to the accumulation of material on their outer surface. Since non-living objects exhibit this external growth, growth cannot be used as an unexceptional feature to differentiate the two.
2. Metabolism: Metabolism refers to the sum total of all chemical reactions occurring inside a living organism. Although metabolic reactions can be simulated in laboratory test tubes (in vitro), these isolated reactions are not considered living organisms, but rather living reactions.
3. Reproduction: Reproduction is the biological process by which an organism produces offspring similar to itself. A fundamental property of reproduction is that it is entirely absent in the non-living world. Absolutely no non-living object (such as a rock, water, or a machine) has the capacity to reproduce or replicate itself. Although there are certain living organisms that do not reproduce (such as mules, sterile worker bees, and infertile human couples), the characteristic of reproduction remains an exclusive attribute of living entities because it never occurs in non-living things. Therefore, living and non-living entities can be differentiated unexceptionally on the basis of reproduction.
4. Consciousness: Consciousness is the ability of an organism to sense its environment and respond to external stimuli. While all living organisms exhibit consciousness, the ability to replicate and reproduce remains the most tangible, macroscopic differentiator between the living and non-living states.