5 Organs - Leaf Adaptations, Roots - Lecture 5 BioSci 1C...

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Lecture: 5 BioSci 1C Apr.4.07 Plant Organs, Leaves and Roots Begin on page 15.
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Adaptations for Environmental Extremes • Xerophytes – Grow in dry climates – Leaves designed to conserve water, store water, insulate against heat Sunken stomata Thick cuticle Sometimes multiple layers to epidermis stoma Oleander multiple epidermis Fig
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Adaptations for Environmental Extremes • Xerophytes – Abundance of fibers in leaves Help support leaves Help leaf hold shape when it dries – Examples Oleander ( Nerium oleander ) Fig ( Ficus ) Jade plant ( Crassula argentea )
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Adaptations for Environmental Extremes • Hydrophytes – Grow in moist environments – Lack characteristics to conserve water – Leaves • Thin Thin cuticle Often deeply lobed • Mesophytes – Grow in moderate climates
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Leaf Modifications • Spines – Cells with hard cell wall – Pointed and dangerous to potential predators Leaf modifications for defense
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Leaf Modifications • Tendrils – Modified leaflets – Wrap around things and support shoot Leaf tendril of Sweet Pea.
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Leaf Modifications • Bulbs – Thick leaves sometimes referred to as bulb scales • Store food and water – Modified branches with short, thick stem and short, thick storage leaves Bulb - storage Swollen leaf base Stem Leaf Blade
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Leaf Modifications • Plantlets – Leaves have notches along margins – Meristem develops in bottom of each notch that produce a new plantlet – Plantlet falls off leaf and roots in soil – Form of vegetative (asexual) reproduction – Example Air-plant ( Kalanchoe pinnata )
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Fig. 6-17, p. 101 tendril plantlets
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A fly on a Venus Flytrap plant. Credit: © Gary Meszaros/Visuals Unlimited 196021
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Venus fly trap Pitcher plants Leaf modifications for feeding
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Leaf Abscission Abscission – separation Result of differentiation and specialization at region at base of petiole called abscission zone – Weak area due to
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