📖 Samacheer Kalvi · 11th TN - English Medium · Bio Botany · Page 71question

Taxonomy of Angiosperm · Part 11

Chapter 4: 4 · Bio Botany

a style and an apical structure that receives pollen called a stigma . Ovary with stipe is called stipitate ovary. Carpel : They are components of a gynoecium. Gynoecium is made of one or more carpels.

Carpels may be distinct or connate. . . Number of carpel Unicarpellary (monocarpellary) Single carpel Example: ­Fabaceae Bicarpellary Two carpels Example: Rubiaceae Tricarpellary Three carpels Example: Cucurbitaceae Tetracarpellary Four carpels Example: Lamiaceae.

Multicarpellary Many carpels Example: Nymphaeceae . . . Fusion of carpels It is an important systematic character.

Apocarpous gynoecium is generally thought to be ancestral condition in Angiosperms. Figure . : Pistil Stigma Style Ovary Apocarpous A pistil contains two or more distinct carpels. Example: Annona .

Syncarpous A pistil contains two or more carpels which are connate. Example: Citrus , tomato. c0"Crqectrqwu Septum C.S. Stipe Carpels locules d0"U{pectrqwu"wpknqewnct e0"u{pectrqwu"vgvtcnqewnct Carpels locules Figure .

: Fusion of carpels . . Number of locules Ovary bears ovules on a specialized tissue called placenta . A septum is a crosswall or partition of ovary.

The walls of ovary and septa form a cavity called locule . Like that tetralocular and pentalocular ovaries are present according to the locule numbers four or five. More than one locule ovaries are called plurilocular . A.

Bilocular Crossandra Brassica Hibiscus Banana C. Tetralocular B.Trilocular D. Pentalocular L L L L L L L L L Ovule Ovule Figure . : Locules .

. Extension of the condensed internode of the receptacle . Anthophore :The internodal elongation between calyx and corolla. Example: caryophyllaceae ( Silene conoidea ) Anthophore Calyx Corolla Figure .

: (a) Anthophore . Androphore : The internodal elongation between the corolla and androecium. Example: Grewia . Corolla Androecium Androphore Figure .

: (b) Androphore . Gynophore : The internodal elongation between androecium and gynoecium. Example: Capparis . Figure .

: (c) Gynophore . Gynandrophore or Androgynophor e: The unified internodal elongation between corolla and androecium and androecium and gynoecium. Example: Gynandropsis . Figure .

: (d) Androgynophore . . Ovary position The position or attachment of ovary relative to the other floral parts. It may be classified into

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