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Symmetry and asymmetry in the angiosperms. Angiosperm : from Greek αγγειον + σπερμα (protected seed) Characteristics vascular plants having seeds producing.

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Presentation on theme: "Symmetry and asymmetry in the angiosperms. Angiosperm : from Greek αγγειον + σπερμα (protected seed) Characteristics vascular plants having seeds producing."— Presentation transcript:

1 Symmetry and asymmetry in the angiosperms

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

3 How many species exist?? 720 20 000

4 Angiosperms MONOCOTS mostly herbaceous DICOTS herbaceous arboreal

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

6 Monocots or Dicots ?? D M M DM

7 M M D D D

8 Monocots zygomorphic = bilateral Dicots Macroscopic

9 Actinomorphic = radial MonocotsDicots

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

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

12 Monocots or Dicots? A M A D

13 MonocotsDicots SYMMETRICAL ??

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

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

16 Ovary of Capsella

17 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


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