Biology lecture 7

Biology lecture 7 - New biological terms used in this...

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1 New biological terms used in this lecture: (Slides have been re-arranged and some are new and some have been modified for increased clarity and coherence.) Growth Phototropic Development Geotropic Auxin Inflorescence Abscisic acid Florigen Cytokinin Long-day plants Gibberellin Short-day plants Phytochrome Day-neutral plants Epigeal seed germination Double fertilization Hypogeal seed germination Hypoxia Apical dominance Aerenchyma Tropic movements in plants Protease inhibitors
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2 Growth, Development and Responses to Environmental Stresses Biol 111-2011-Lecture 7 (Rajinder Dhindsa) But first, some clicker questions on the material in the last lecture !
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3 Water and minerals can move from soil to the root xylem. Which one of the following statements correctly describes apoplastic path? Inte rc ellular s pa ces a. . Cytop lasm and plas .. Onl y v acuoles o f all ce. 74% 3% 23% 1. Intercellular spaces and cell wall regions. 2. Cytoplasm and plasma membrane of all cells. 3. Only vacuoles of all cells.
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4 Shoo t apical m e riste m Root api c a l meristem Va s u r ca b iu Ep id rma l la ye r 28% 23% 34% 15% All dicot stems undergo secondary growth. Which of the following embryonic cell layers is involved in secondary growth? 1. Shoot apical meristem 2. Root apical meristem 3. Vascular cambium 4. Epidermal cell layer
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5 What do we mean by Growth and Development? Growth: Irreversible quantitative increase. Irreversible increase in height, volume, weight, volume, or number in case of populations. Development: Qualitative changes in body structure or function. Examples: Development of organs, (organogenesis), achieving final shape and size (morphogenesis), Juvenile phase, adult phase (sexual maturity, flowering, senescence or physiological aging.
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6 Plant hormones or phytohormones Regulate plant growth and development and active at very low concentrations
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7 Growth is an irreversible increase in: 1. Number of individuals in a population; 2. Size; or 3. Dry weight. 4. A graph of growth vs time always yields an S-shaped curve. 5. The graph shown is for increase in number of cells ina culture of unicellular alga. 6. Human population has not yet reached the stationary phase. Growth in individual or population of organisms
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Tropic Growth Movements: Shoot tips show positive phototropic growth When monocot seeds are germinated in the dark, seedling that emerges from the soil is a conical structure called coleoptile which has the first leaf inside it. Coleoptile bends towards unidirectional light. Why? The hormone moves to
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This note was uploaded on 09/29/2011 for the course BIO 111 taught by Professor Irenegregory-eaves during the Fall '08 term at McGill.

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Biology lecture 7 - New biological terms used in this...

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