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Taxonomy and Systematic Botany — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYTaxonomy and Systematic Botany5 Marks
Question
Explain Datura metal in botanical terms. Draw floral diagram.
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Answer


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  1. Habit: Large, erect and stout herb.
  2. Root: Branched tap root system.
  3. Stem: Stem is hollow, green and herbaceous with strong odour.
  4. Leaf: Simple, alternate, petiolate, entire or deeply lobed, glabrous exstipulate showing unicostate reticulate venation.
  5. Inflorescence: Solitary and axillary cyme.
  6. Flower: Flowers are large, greenish white, bracteate, ebracteolate, pedicellate, complete, heterochlamydeous, pentamerous, regular, actinomorphic, bisexual and hypogynous.
  7. Calyx: Sepals 5, green synsepalous showing valvate aestivation. Calyx is mostly persistant, odd sepal is posterior in position.
  8. Corolla: Petals 5, greenish white, sympetalous, plicate (folded like a fan) showing twisted aestivation, funnel shaped with wide mouth and 10 lobed.
  9. Androecium: Stamens 5, free from one another, epipetalous, altemipetalous and are inserted in the middle of the corolla tube. Anthers are basifixed, dithecous, with long filament, introse and longitudinally dehiscent.
  10. Gynoecium: Ovary bicarpellary, syncarpous superior ovary, basically bilocular but tetralocular due to the formation of false septum. Carpels are obliquely placed and ovules on swollen axile placentation. Style simple long and filiform, stigma two lobed.
  11. Fruit: Spinescent capsule opening by four special valves with persistent calyx.
  12. Seed: Endospermous
  13. Floral Formula
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