Class 11 Biology Plant Kingdom Introduction

Introduction 

  • Plant kingdom is divided into Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms.
  • Artificial system of classification used gross superficial morphological characters and were based mainly on vegetative characters or on the androecium structure.
  • Natural classification systems were based on natural affinities among the organisms and consider not only the external features, but also internal features.
  • Phylogenetic classification systems are based on evolutionary relationships between various organisms which assumes that organisms belonging to the same taxa have a common ancestor.
  • Numerical Taxonomy is based on all observable characteristics, where number and codes are assigned to all the characters and the data are then processed.
  • Cytotaxonomy that is based on cytological information like chromosome number, structure, behavior.
  • Chemotaxonomy is based on the chemical constituents of the plant.

Class_11_Biology_Plant_Kingdom_Algae

Fig. algae, bryophytes, pteridophytes, gymnosperms, angiosperms

 

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