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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 !! 20 000
Angiosperms MONOCOTS mostly herbaceous DICOTS herbaceous arboreal
Number of shape of the disposition of ribs of the structure ofcots roots conductive vessels leaves the flowers monocots dicots
Monocots or Dicots ?? M D M D M
M D M D D
zygomorphic = bilateralMacroscopic zygomorphic = bilateral Dicots Monocots
Actinomorphic = radialMonocots 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 fruticosaEvening 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
Std. 10 Plants Foldable Distinguish between monocots and dicots, angiosperms and gymnosperms, and vascular and nonvascular plants.
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