Growth is the outcome of cell division, cell enlargement and cell differentiation. Scientifically, growth is the increase in dry weight. Plant growth is measured by Auxanometer.
Plants grow faster than animals and some grows much taller than animals. Plant growth is completed in four phases:
A. Lag phase: It is the initiating phase.
B. Log/ Exponential phase: It is the phase in which maximum growth occurs.
C. Stationary phase: This is the phase in which growth remains constant.
D. Decelerating phase: In this phase the growth rate decreases.
The idea of existence of growth promoting substance in plant was given by Charles Darwin. The major plant hormones are auxin, gibberellin, cytokinin, ethylene and abscissic acid.
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