living organism exhibit distinctive characteristics, which are as follows
(i) Growth All living organisms grow in size as well as in number. Plants
show growth all through their life whereas animals up to a certain growth
period after which growth ceases.
(ii) Reproduction The process of reproduction is essential
for the continuity of life on earth. Every organism whether unicellular or
multicellular gives rise to an individual of its own kind. Lower organisms
usually reproduce asexually, e.g.. Hydra, fungi, yeast, etc.
Sexual reproduction is found in advanced group of
organisms, which involves two parents. In Amoeba growth and reproduction
however is synonymous.
(iii) Metabolism There are thousands of enzymatic ally
controlled reactions occurring in all living cells. These are synthesizing
(anabolic) and breaking down (catabolic) reactions.
Hence, it is the most important characteristic of living
(iv) Response to stimuli Consciousness and response to
stimulus is the defining property of all living organisms. Plants respond to
light, water temperature. Unicellular organisms also sense their environment
and respond accordingly.
(v) Cellular organization The cellular organization of the
body is the defining feature of life forms. Cells work together in hierarchical
manner group of cells make tissues, tissues make organs, organs make systems,
systems when work in co-ordination form an individual.
So, we can say living organisms are self replicating,
evolving and capable of responding to external stimuli.
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