Post on 24-Feb-2016
description
Symmetry and
asymmetry in the
angiosperms
Angiosperm : from Greek αγγειον + σπερμα (protected seed)
Characteristics • vascular plants
• having seeds producing flowers and fruits
How many species exist??720
20 000
250 000 !!
AngiospermsMONOCOTS
• mostly herbaceous
DICOTS
• herbaceous• arboreal
mon
ocot
sdi
cots
Number of shape of the disposition of ribs of the structure of cots roots conductive vessels leaves the flowers
Monocots or Dicots ??
D M M
D M
M M
D D
D
Monocots
zygomorphic = bilateral Dicots
• Macroscopic
Actinomorphic = radial Monoco
ts
Dicots
Monocots or Dicots?
Zygomorphic or Actinomorphic?
M
ZM
Z
Monocots or Dicots?
Zygomorphic or Actinomorphic?
D
A
DA
Zygomorphic or Actinomorphic?
Monocots or Dicots?A
MA
D
Monocots
DicotsSYMMETRICAL ??
• Microscopic
Helianthus annuusSunflower
Pollens
Ipomoea purpureaPurple morning glory
Sidalcea MalvifloraMallow
Oenothera fruticosa Evening primrose
Lilium auratum Lily
Ricinus communisCastor bean plant
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