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Introduction to the Angiosperms

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Introduction to the Angiosperms Chapter 19 Angiosperms- Anthophyta Autotrophic, but parasitic and saprophytic representatives. Enclosure of ovules within carpels. – PowerPoint PPT presentation

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Title: Introduction to the Angiosperms


1
Introduction to the Angiosperms
  • Chapter 19

2
Angiosperms- Anthophyta
  • Autotrophic, but parasitic and saprophytic
    representatives.
  • Enclosure of ovules within carpels.
  • Ovule- the structure in seed plants that contains
    the female gametophyte with egg cell including
    nucellus and integuments.
  • Presence of endosperm in seeds.
  • Flower present with stamens (microsporophylls)
    carpels (megasporophylls).
  • Species- 300,000-450,000

3
Class Monocotyledonae- monocots
  • Flower parts- 3s.
  • Pollen- monoaperturate.
  • Cotyledons- 1.
  • Leaf venation- parallel.
  • 1 vascular bundles in stem- complex.
  • 2 growth without vascular cambium.
  • Examples- grasses, lilies, irises, orchids,
    cattails, palms.

4
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5
Class Eudicotyledonae- dicots
  • Flower parts- 4s 5s.
  • Pollen- triaperturate.
  • Cotyledons- 2.
  • Leaf venation- netlike.
  • 1 vascular bundles in stem- ring.
  • 2 growth with vascular cambium.
  • Examples- trees, shrubs, herbs.

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9
Ovary Position
  • Hypogynous- whorls attached below the ovary.
  • Perigynous- stamens and petals adnate to the
    calyx, forming a tube (hypanthium) at the base of
    the ovary.
  • Epigynous- whorls attached above the ovary.

10
Epigyny in Malus (apple) flower
11
Mature Anther with 4 Microsporangia
12
Mature Embryo Sac- 8 nuclei, 7 celled
structure
13
Double Fertilization
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16
Endosperm- tissue that contains stored food that
is digested by the sporophyte before or
after maturation of the seed.
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