9.3 Growth in plants
IB Syllabus Statements
Understandings:
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Undifferentiated cells in the meristems of plants allow indeterminate growth.
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Mitosis and cell division in the shoot apex provide cells needed for extension of the stem and development of leaves.
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Plant hormones control growth in the shoot apex.
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Plant shoots respond to the environment by tropisms.
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Auxin efflux pumps can set up concentration gradients of auxin in plant tissue.
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Auxin influences cell growth rates by changing the pattern of gene expression.
Applications and skills:
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Application: Micropropagation of plants using tissue from the shoot apex, nutrient agar gels and growth hormones.
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Application: Use of micropropagation for rapid bulking up of new varieties, production of virus-free strains of existing varieties and propagation of orchids and other rare species.
Videos
Growth in Plants Intro
Micropropagation
Auxins and Phototropism
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Topic 9.3 Growth in plants HookED SOLO Hexagons
Topic 9.3 Growth in plants SSaQ (Syllabus Statement as Questions)
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How is indeterminate growth made possible in the meristems of plants?
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Mitosis and cell division provide cells in the shoot apex of plants to promote the development of what?
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Which plant hormone controls growth in the shoot apex of plants?
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Explain what is meant by the term tropism.
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Explain the role of auxin efflux pumps in plant tissue.
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Explain the links between the following term: auxin, efflux pump, hydrogen ions, gene expression
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Outline the process of plant micropropagation
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Explain the following uses of micropropagation in plants