______ INTRODUCTION TO
ANGIOSPERMS _______
Angiosperms:
dominant plants of the world Nearly all croplands, forests,
shrublands, grasslands, and deserts
How are angiosperms different from
gymnosperms? (Note: angiosperms probably arose from gymnosperms)
|
Generation
|
Gymnosperms
|
Angiosperms
|
|
Sporophyte
|
1.
Staminate and ovulate cones
2.
Usually sieve cells and tracheids
|
1.
Flowers, stamens, and carpels
2. Sieve cells with companion cells, tracheids
and vessels
|
|
Gametophyte
|
1.
Usually motile sperm
2.
Reduced archegonium
|
1.
Nonmotile sperm
2. Little archegonium (synergids?)
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|
Fertilization
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1.
Single fertilization (no endosperm)
|
1.
Double fertilization (endosperm)
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