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Study of external structure. Primary root develops from radicle Produce secondary, tertiary roots etc Tap root system- primary roots and its branches.

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Presentation on theme: "Study of external structure. Primary root develops from radicle Produce secondary, tertiary roots etc Tap root system- primary roots and its branches."— Presentation transcript:

1 Study of external structure

2 Primary root develops from radicle Produce secondary, tertiary roots etc Tap root system- primary roots and its branches Fibrous root system- wheat Adventitious root system- other functions- banyan tree

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4 Prop roots- banyan tree Stilt root- sugar cane Pneumatophores- mangroves

5 Nodes and internodes Absorption of water and minerals, conduction anchorage, storage, protection, spreading out leaves, flowers etc

6 Underground stem modification for food storage- potato, ginger etc Axillary buds to thorns as in Citrus

7 Photosynthesis- cactus Spreading- grass, chrysanthemum Vegetative propagation- pistia

8 From node for photosynthesis Leaf base, petiole and lamina

9 In monocotyledons-sheath Pulvinus – in leguminous plants Veins are the channels for conduction

10 Arrangement of veins and veinlets parallel

11 Simple- china rose Pinnately compund leaf -neem Palmately compound leaf -cotton

12 Pattern of arrangement of leaves Alternate- china roseOpposite- guava Whorled- alstonia

13 Tendrils- peas Spines- cactus Food storage- onion Acacia- stem modified for photosynthesis insectivorous

14 Flower- modified shoot Arrangement of flowers- inflorescence Recemose- ceasalpinia Cymose- jasmine

15 Reproductive unit Four whorls on thalamus- calyx, corolla, androecium and gynoecium Reproductive- androecium, gynoecium Acessory- calyx and corolla perianth

16 symetry Actinomorphic- chilly, datura Zygomorphic- pea, cassia Asymmetric- canna

17 Trimerous, tetramerous or pentamerous Bracteate, ebracteate

18 Perigynous- rose epigunous- sunflower

19 Corolla- coloured,peltals, gamo/polypetalous Calyx- sepals, green, protection, gamosepalous/polysepalous

20 Arrangement of sepals or petals in floral bud aestivation Valvate- calotropis Twisted- cotton Imbricate-cassia Vexillary/papilonaceous- pea

21 Filament and anther Composed of stamens Staminode- sterile stamen Epipetalous- attached to petals Epiphyllous- attached to tepals

22 United into one bunch- monoadelphous- china rose Polyandrous- remain free Two bundles- pea Polyadelphous- citrus Varying length- salvinia

23 Carpel- style, stigma and ovary Made up of carpels Ovary bears placenta- ovules Apocarpous- carpels free syncarpous- carpels united

24 Marginal- pea Placentation- arrangement of ovules Parietal-mustard Free central- primroseBasal- sunflower

25 Mature ripened ovary Parthenocarpic fruit- formed without fertilization- banana Dry pericarp- epicarp, mesocarp, endocarp- coconut, mango Pericarp- walls of fruit, fleshy or dry

26 Ovules develop into seeds Seed coat and embryo Embryo- monocotyledon or dicotyledon

27 Dicotyledonous seed Seed coat – testa and tegmen Hilum- scar where seed attached to fruit Micropyle- small pore Embryo- embryonal axis and two cotyledons Embryonal axis- radicle and plumule endosperm

28 monocotyledonous seed Seed coat – fused with fruit wall Aleuron layer- separates endosperm and embryo One cotyledon- scutellum Endosperm bulky Radicle is covered by coleorhiza Plumule is covered by coleoptile

29 Floral formula- Br- bracteate K- calyx C- corolla P- perianth A- androecium G- gynoecium G – superior ovary G- inferior ovary G - half inferior bisexual male female actinomorphic zygomorphic

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31 K(5) C(5)A5 G(2)

32 K5 C5A(10) G5

33 Earlier called Papilionoideae, sub family of Leguminosae Distributed world over Trees, shrubs,herbs, root with root nodules Erect stem or climber Leaves: alternate, pinnaltely compund or simple, leaf base pulvinate, stipulate, reticulate

34 Floral characters

35 Fruit: Legume, many seeded Floral Formula

36 Economic importance: pulses- gram, moong, soyabean: Edible oil- soyabean, ground nut Dye- Indigofera Fibres- sunhemp Fodder- sesbania Ornamentals- sweet pea Medicine- muliathi

37 Called potato family Distributed everywhere Herbs, shrubs, rarely trees Herbaceous stem, hairy or glabrous Leaves: alternate, simple, exstipulate, reticulate

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40 Food- tomato, brinjal, potato Spice- chilli Medicine- belladona Fumigatory- tobacco Ornamentals- petunia

41 Called lily family- monocotyledons Distributed everywhere Perennial herbs with underground bulbs c Herbaceous stem, hairy or glabrous Leaves: alternate, simple, exstipulate, reticulate

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