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Plants 9.3 Growth in Plants Growth in Plants Undifferentiated cells in the meristems of plants allow indeterminate growth Many plant cells have the capacity to generate whole plants (totipotent). Growth in plants is confined to regions known as meristems. Meristems = composed of undifferentiated cells that are undergoing active cell division. Primary meristems are found in the tips of stems and roots = APICAL MERISTEMS Many dicotyledoenous plants also develop lateral meristems. Growth in Plants Mitosis and cell division in the shoot apex provide cells needed for the extension of the stem and development of leaves. Activity: Think-Pair-Share. Recall the stages of Mitosis and cell division. Write down what you can remember. Talk with your seatmate. Discuss with class. Growth in Plants Mitosis and cell division in the shoot apex provide cells needed for the extension of the stem and development of leaves. Cells in meristems are small and go through the cell cycle repeatedly to produce more cells. The new cells absorb nutrients and water and increase in volume and mass. Growth in Plants Mitosis and cell division in the shoot apex provide cells needed for the extension of the stem and development of leaves. The root apical meristem is responsible for the growth of the roots. The shoot apical meristem produces cells needed for the growth of the stem and also cells that will develop into leaves and flowers. Young leaves appear as small bumps known as “leaf primodia” Growth in Plants Mitosis and cell division in the shoot apex provide cells needed for the extension of the stem and development of leaves. Protoderm = cells that will give rise to epidermis. Procambium = cells that give rise to vascular tissue. Ground meristem = cells that give rise to pith. Chemical influences play a large role in determining the type of specialized cell. Growth in Plants Plant hormones control growth of the shoot apex. Hormone= chemical message produced in one part of an organism and has an effect in another part. Auxins = plant hormones with a broad range of functions including: Initiating the growth of roots Development of fruits Regulating leaf development Growth in Plants Read about the effects of auxin pages 424-428 Complete Data question pg 424