how many types of meristematic tissue? what are they?explain them with examples?
Answers
Answer:
There are three types of meristematic tissues: apical (at the tips), intercalary (in the middle), and lateral (at the sides). At the meristem summit, there is a small group of slowly dividing cells, which is commonly called the central zone.
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Differentiated plant cells generally cannot divide or produce cells of a different type. Meristematic cells are undifferentiated or incompletely differentiated, and are totipotent and capable of continued cell division. Division of meristematic cells provides new cells for expansion and differentiation of tissues and the initiation of new organs, providing the basic structure of the plant body. The cells are small, with no or small vacuoles and protoplasm fills the cell completely. The plastids (chloroplasts or chromoplasts), are undifferentiated, but are present in rudimentary form (proplastids). Meristematic cells are packed closely together without intercellular spaces. The cell wall is a very thin primary cell wall.
Answer:
Meristematic tissue : A tissue which consist of dividing cells or the cells having power of cell division is called meristimatic tissue.
i. The cells of meristematic tissue are living and possess the power of division.
ii. Each cell contains dense protoplasm and prominent nucleus.
iii. The cells are small isodiametric, oval or polygonal in shape.
iv. The cells are compactly arranged without intercellular spaces.
v. The cell wall is thin, elastic and made up of cellulose.
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☯ There are 3 types of meristimatic tissue :
i) Apical meristem: These are growing points which are situated at the apices of main as well as secondary root and shoot.
ii) Intercalary meristem: Intercalary meristems are the parts of apical meristems which get separated from them due to the formation of permanent tissue in between. They are present at the base of internode in grasses and wheat or at the base of node in mint.
iii) Lateral meristem: These meristems are arranged parallel to the sides of the organs or around the central axis of the organ.