About Lesson
a. Middle lamellae:
- Consists of pectic acid in the form of Ca. and Mg. salts.
- Hydrophilic in nature.
b. Primary wall:
- Consists of cellulose, lignin and hemi-cellulose and some pectic substances and proteins.
c. Secondary wall:
- Consists of cellulose and lignin.
- Contain dead cells.
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