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MERISTEMATIC TISSUE Characteristic Apical Intercalary Lateral meristem
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Meristematic tissue: • A meristematic tissue (meristos = divisible) is a group of identical cells that are in a continuous state of division. Some cells produced by meristematic tissue stop dividing and acquire certain changes to become permanent tissues of the plant. This change from meristematic to permanent tissue is called differentiation. The remaining cells in the meristem retain their meristematic activity. Meristematic cells are self-perpetuating. • Characteristics of meristematic cells: • The meristematic cells may be round, oval, polygonal or rectangular in shape. They are closely arranged without intercellular spaces. They have dense cytoplasm with large nucleus. They have smaller vacuoles, which are scattered throughout the cytoplasm. Their cell walls are thin, elastic and made up of cellulose. • Classification of meristem: • Based on its position, the meristem is divided into three types – apical meristem, intercalary meristem and lateral meristem. • Apical meristem: • Apical meristem is found at the tips of roots, stem and branches. It is • responsible for increase in length of plant. It is divided into three zones – • protoderm, procambium and ground meristem. Protoderm gives rise to epidermal tissue; procambium gives rise to primary vascular tissues and ground meristem gives rise to cortex and pith. • Intercalary meristem: • It is present in the nodal region and is prominently found in monocotyledons, eg. grasses. As the name indicates, it is present in between the permanent tissues. It is derived from the apical meristem and is responsible for the elongation of internodes. • Lateral meristem: • The meristem that is present along the longitudinal axis of stem and • root is called lateral meristem. Vascular cambium and cork cambium • (phellogen) are examples for lateral meristem. It produces secondary • permanent tissues, which result in the thickening of stem and root. • #CBSE Class 9 • #Meristematic Tissue • #Apical meristem • #Intercalary meristem • #Lateral meristem • • Disclaimer • This channel does not promote or encourage any illegal activities. • All contents provided by this channel for general and education purpose only. • Copyright disclaimer under section 107 of the copyright act 1976,allowance is made for fair use policy for purposes such as criticism, comment, news reporting,teaching,scholarship and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.
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