Question
Which are called complex permanent tissues? Describe in detail.
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Answer
The complex permanent tissues are made of more than one type of cells. They are of two types:
- Xylem.
- Phloem.
- It is present only in layer below the epidermis in dicotyledonous plants.
- It is found either as a homogeneous layer or in patches.
- Collenchyma consists of cells which are much thickened at the corners due to a deposition of cellulose, hemicellulose and pectin.
- The cells may be oval, spherical or polygonal and often contain chloroplasts.
- These cells assimilate food, when they contain chloroplasts.
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