How many types of secretary cavities are there? Explain with examples

How many types of secretary cavities are there? Explain with examples 
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Ans: There are two types of secretary cavities known as Lysigenous cavities and Schizogenous cavities. 

1. Lysigenous cavities: These are formed by the lysis of secretary cells. The cavities are surrounded by ruptured layers of cells. Ex: Oil cavities of Citrus and Eucalyptus. 

2. Schizogenous cavities: These are formed by enlargement of intercellular spaces present between secretary cells. The lining layer of cells is called as epithelium. Ex: Pinus resin ducts.  
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