an integrated group of cells with a common structure - PowerPoint PPT Presentation

������� ������� an integrated group of cells with a common structure and function

������������� ������������� Meristematic tissue: rapid cell division, 1. lengthening of shoots and roots Dermal tissue : covering for the plant 2. body Ground tissue : support, photosynthesis, 3. and storage Vascular tissue : conduction of water, 4. food, and dissolved minerals; strengthens and supports the plant

������������ ������������ ������ ������ � cells that do not differentiate � cells retain the ability to divide � Types: � Types: � Apical – primary growth at root and shoot tips � Lateral – secondary growth in trees and shrubs � Intercalary – secondary growth in monocot stems

Region of cell differentiation ������� ��������������� �������� /maturation Region of cell � In shoot tips and elongation root tips � Allium cepa root tip Region of cell division Apical meristem Root cap

�������������� �������������� Epidermis � Single layer of cells called the epidermis in herbaceous plants � Guard cells � Trichomes � Trichomes � Root hairs � Functions � Absorption � Secretion of cuticle � Protection Cuticle � Control of gas exchange

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����������� ����������� � beneath the epidermis in young stems and in large veins of leaves � elongated cells that have unevenly thickened cell unevenly thickened cell walls � alive at maturity � flexible support system � found uniformly throughout the plant

������������ ������������ � structural support � two types: � fibers – support in wood, bark, leaves, stems stems � sclereids – protection in fruits, seeds, other plant organs � primary and secondary cell walls. � dead at functional maturity

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�������� �������� ���������������� ���������������� � Xylem � Conducts water and dissolved minerals from the roots � Phloem � Conducts dissolved food Conducts dissolved food materials, carbohydrates, in solution � Continuous throughout plant � Support plant body

All 4 types of tissues are present in the root tip

Young monocot stem Young dicot stem