Variations in Plants Part -1

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ORIGIN OF LAND PLANTS : ORIGIN OF LAND PLANTS Land plants are monophyletic, all descend from a single common ancestor. Development from an embryo protected by tissues of the parent plant. Also therefore, called embryophytes.

CHARACTERS COMMON WITH ALGAE : CHARACTERS COMMON WITH ALGAE Land plants retain derived features they share with green algae: Chlorophyll a and b. Starch as a storage product. Cellulose in cell walls.

LIVING PLANTS : LIVING PLANTS Fossilized plant spores place plants on land over 500 mya. Sporopollenin in cell wall is the most durable organic material known

Slide 5 : Bryophyta Non vascular plants TRACHEOPHYTA Vascular plants Pteridophytes VASCULAR CRYPTOGAMS PLANTAE

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ORIGIN OF PLANTS : ORIGIN OF PLANTS

Slide 8 : The size of the gametophypte dwindles as we move from mosses to ferns to seed plants. The gametophyte of a seed plant is microscopic and not green (does not carry out photosynthesis)

Slide 9 : ROBERT BRAUN Gave his term

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