Symmetry and asymmetry in the angiosperms.

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Presentation transcript:

Symmetry and asymmetry in the angiosperms

Characteristics Angiosperm : from Greek αγγειον + σπερμα (protected seed) Characteristics vascular plants having seeds producing flowers and fruits

How many species exist?? 720 250 000 !! 20 000

Angiosperms MONOCOTS mostly herbaceous DICOTS herbaceous arboreal

Number of shape of the disposition of ribs of the structure of cots roots conductive vessels leaves the flowers monocots dicots

Monocots or Dicots ?? M D M D M

M D M D D

zygomorphic = bilateral Macroscopic zygomorphic = bilateral Dicots Monocots

Actinomorphic = radial Monocots Dicots

Monocots or Dicots? M Z M Zygomorphic or Actinomorphic? Z

A Monocots or Dicots? D D Zygomorphic or Actinomorphic? A

Monocots or Dicots? A M A D Zygomorphic or Actinomorphic?

SYMMETRICAL ?? Monocots Dicots

Pollens Microscopic Helianthus annuus Sunflower Oenothera fruticosa Evening primrose Sidalcea Malviflora Mallow Lilium auratum Lily Ipomoea purpurea Purple morning glory Ricinus communis Castor bean plant

Pollen grain of figwort (Ranunculus ficaria) What is it ?? Pollen grain of figwort (Ranunculus ficaria)

Ovary of Capsella

Conclusion When the flower is star-shaped it is actinomorph, i.e., it has a radial symmetry On the contrary, when the flower is butterfly-shaped it is zigomorph, i.e., it has a bilateral symmetry