Ans this Q wid explanation

Dear student,

The correct sequence for different phases of growth in an organism is
1. Cell formation 
2. Cell elongation
3. Cell differentiation

The grand period of growth can be defined as the whole of the time during which a cell, organ or plant part increases in size, slowly at first, then faster and more slowly again until it is mature. In other words, it incorporates the time between cell formation and cell differentiation.
Thus the correct answer is option 4.

Regards

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