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Q. Addition of new cell wall particles amongst the existing ones is

AIPMTAIPMT 1991Cell : The Unit of Life

Solution:

Addition of new cell wall particles amongst the existing one is intussusception. Growth of cell wall occurs by two methods - By intussusception and by apposition. By intussusception, the primary wall is stretched and materials of secondary wall are deposited. By apposition, material of secondary wall are deposited in the form of thin layers.