What is the growth?
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Living things grow with increase in mass and increase in number of individuals
or cells. In multicellular organisms, growth occurs by cell division or increase in
number of cells.
This growth occurs continuously in plants throughout
their lifespan, whereas in animals, it occurs only up to a
certain age . However, growth, replacement of lost cells,
occur throughout the
In unicellular organisms, growth can be observed under
the microscope by simply counting the number of cells
via in vitro experiment. Such organisms grow by cell
division. Since, in unicellular organisms, a single cell
constitutes an individual, therefore, in such cases, cell
division is basically a means of reproduction.
Non-living things like mountains, boulders, sand dunes
also grow in size, but just by accumulating the material
on their external surface. Thus, growth in living things is
internal, while in non-living things, it is external.
Growth, therefore cannot be taken as the sole defining
criteria for living organisms. It must be accompanied by
the specific conditions under which it can be observed in
all living organisms. It is to be noted that a dead
organism does not grow.