IGNOU LSE 13 2018 - Briefly explain the following terms with proper diagram and write the

Question

Briefly explain the following terms with proper diagram and write the name of the family where the structure is found :
(i) Gynoestegium
(ii) Gynobasic style
(iii) Hesperidium
(iv) Cyathium Inflorescence

23 Jan 2018

Answer :

Word Count : 549

(i) The gynostegium is a typical feature of members of the Milkweed family (Asclepiadaceae). It is a complex structure formed by the fusion of the stamens, styles, and stigmatic surfaces. The gynostegium is commonly provided with colourful and variously shaped appendages (see: Annulus, Corona) and along with the calyx and corolla contribute the give the flower some inimitable and distinctive shape that serve to lead insects to nectar cavity so that pollination is most likely to happen.

The gynostegium is also the most important factor used for Asclepiadaceae classification.

Compare with: Column (The central part of gynostegium formed by the fusion of the stamens only)

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(ii) The gynobasic style arises from the base of the ovary, or between the ovary lobes and is characteristic of Boraginaceae. Subgynobasic styles characterise Allium

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(iii) A hesperidium (plural

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