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Unformatted text preview: 10 (2, 4) (Campbell et al.) 61 Double fertilization • In ovule, egg develops from 1 cell of the
female gametophyte (NO Archegonium)
• Pollen tube (w/ 2 sperm) grows into ovule
• 1st sperm fertilizes egg zygote formation.
• 2nd sperm fertilizes another cell
of the female gametophyte endosperm formation
(embryo food supply)
ONLY occurs in angiosperms.
Figure 30.10 (3, 5) (Campbell et al.) 62 Fruit Development Once the egg is fertilized,
the surrounding ovary wall
thickens forming a fruit.
Seed = Embryo (2n)
+ endosperm (2n)
+ seed coat
+ thickened wall of ovary 63 Fruit Structure
• Thickened wall of fruit
• Develops from ovary wall Soft
pericarp Figure 30.8 (Campbell et al) 65 Fruit &
Fleshy & often colorful
Fruits with hard seeds:
Light seeds with hooked
ON animals Figure 30.9 (Campbell et al) 66 Coconuts
Long distance marine dispersal
Huge, floating, energy packed seeds 67 Amazon floodplain forests:
flooded for up to six months:
trees fruit during ‘high water’
: water dispersal 68 Seed dispersal
by fishes seed predation by fishes 78 Readings on which you will NOT be tested Fossil Angiosperms (on pg. 628)
Evolutionary links between angiosperms and animals (pg. 632)
Figure 30.16 In general:
– You are NOT responsible for definitions of terms or sections included in the text
but which were not discussed in lecture
– You are not responsible for the details of examples used in the text but not discussed in
lecture. HOWEVER, these additional examples will help your understanding of concepts
discussed and may be used on exams to test if you understand the general concepts.
– You ARE responsible for material covered in lecture but not included in the readings 79 Next Chapter Chapter 32 – An Overview of Animal Diversity...
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