Collenchyma, thickened at corners with cellulose, hemicellulose, and pectin, occurs in layers below the epidermis in dicot stems and provides mechanical support to growing parts.
The {{c3::collenchyma}} occurs in layers as the {{c2::hypodermis}} in most of the {{c2::dicotyledonous}} {{c3::stems}}. It is<br><br>found either as a {{c1::homogeneous layer}} or in {{c1::patches.}}<br><br>It consists of cells which are much thickened at the<br><br>corners due to a deposition of {{c4::cellulose}},<br><br>{{c4::hemicellulose}} and {{c4::pectin}}. Collenchymatous cells<br><br>may be oval, spherical or polygonal and often<br><br>contain chloroplasts. These cells {{c2::assimilate food}}<br><br>when {{c6::they contain chloroplasts}}. Intercellular spaces<br><br>are {{c2::absent}}. They provide mechanical support to the<br><br>{{c4::growing parts of the plant such as young stem and<br><br>petiole of a leaf}}.
| Text | The collenchyma occurs in layers as the hypodermis in most of the dicotyledonous stems. It is found either as a homogeneous layer or in patches. It consists of cells which are much thickened at the corners due to a deposition of cellulose, hemicellulose and pectin. Collenchymatous cells may be oval, spherical or polygonal and often contain chloroplasts. These cells assimilate food when they contain chloroplasts. Intercellular spaces are absent. They provide mechanical support to the growing parts of the plant such as young stem and petiole of a leaf. |
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Tags: neet-biology::unit-2::anatomy-of-flowering-plants
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