Basic Body Plan, Diversity and Leaf Structure in Angiosperms
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1 Basic Body Plan, Diversity and Leaf Structure in Angiosperms
2 Angiosperm means "contained seeds, the ovules are sealed within the carpel and the seeds sealed within a fruit.
3 Plant body is divided into true roots, stem and leaves. Sporophytic generation is the dominant phase represented by the plant body. Gametophytic generation is reduced and is totally dependent on sporophyte. Flowers display plant s male and female parts and are sites of pollination and fertilization. Generate fruits, which contain seeds.
4 Most of the Angiosperms are autotrophic and have a green pigment chlorophyll for photosynthesis. A few species lack chlorophyll and become parasitic, e.g., Cuscuta, Viscum. Some plants are insectivorous, e.g., Nepenthes, Drosera.
5 INSECTIVOROUS PLANTS Drosera (Sundew) Pitcher plant) Nepenthes (
6 Based on habitat Angiosperms are mainly of Three types: 1. Hydrophytes: These plants grow in aquatic habitats. They have developed aerenchyma and a covering of mucilage. They may be submerged or floating. 2. Mesophytes: These are terrestrial plants growing under moderate moisture temperate conditions. 3. Xerophytes: These are terrestrial plants of dry habitat. They develop adaptations to reduce transpiration and to retain water.
7 HYDROPHYTES Lemna Hydrilla Nymphaea
8 Mesophytes Sunflower Petunia
9 XEROPHYTES Opuntia Nerium
10 Duration and Habit Duration - the life span of an individual plant. Annual - plants live for a single growing season; Biennial - lives for two seasons; Perennial - lives for three or more years and usually flowers and fruits repeatedly. Habit - the general appearance of a plant. Tree - plant with woody tissue present in one primary trunk; Shrub - plant with woody tissue present in several trunks and usually shorter than trees; Herb - plant lacking woody tissue; Liana - climbing plant with woody stems; Vine - climbing plants with herbaceous (nonwoody) stems.
11 Angiosperms (Flowering Plants) Systematists have identified angiosperms into two sub- groups: Monocotyledonous and dicotyledonous. Monocots are angiosperms that possess one embryonic seed leaf (cotyledon). Dicots are angiosperms that possess two embryonic seed leaves (cotyledons).
12 Feature Monocot Dicot Seedling Leaf venation one cotyledon two cotyledons often parallel branching or net-like Flower parts Secondary growth often in threes never truly woody often 4, 5 or many can be woody or herbaceous Roots fibrous tap root
13 A COMPARISON OF MONOCOTS & DICOTS
14 The vegetative parts of angiosperms are roots, stems, and leaves, and the reproductive parts are flowers, fruits, and seeds. Here we outline parts, particularly as they refer to angiosperms.
15 Roots Adventitious - developing from any plant part other than the embryonic root or another root. Fibrous - with all portions of the root system being of more or less equal thickness, often well branched. Taproot - the major root, usually enlarged and growing downward.
16 Stems Stem the axis of plants consists of nodes (where leaves and axillary buds are produced) separated by internodes.
17 Node - region of the stem where the leaf and bud are borne. Internode - the part of the stem between two adjacent nodes. Herbaceous - not woody; dying down at the end of the growing season. Woody - hard in texture, containing secondary xylem, and persisting more than one growing season. Acaulescent - having an inconspicuous stem. Caulescent - having a distinct stem.
18 Bulb - a short, erect, underground stem surrounded by thick, fleshy leaves or leaf bases. Corm - a short, erect, underground, more or less fleshy stem covered with thin, dry leaves or leaf bases. Rhizome - a horizontal stem, more or less underground, bearing scalelike leaves; often called a stolon if above ground and having an elongated internode. Scape - an erect leafless stem bearing an inflorescence or flower. Thorn - a reduced, sharp-pointed stem. Tuber - a swollen, fleshy portion of a rhizome involved in water or carbohydrate storage.
19 Buds Buds are short embryonic stems. In angiosperms they are found at the nodes, in the leaf axil (the angle formed by the stem and the petiole of the leaf). Axillary bud - a bud located in the leaf axil. Terminal bud - a bud at the apex of a stem.
20 THANK YOU
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