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Introduction to Angiosperms! - PowerPoint PPT Presentation

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Introduction to Angiosperms! "Flowering Plants" Overview Quick Review! Gymnosperms Naked seed Cones as reproductive structures Thin, needle like leaves Large growing plants Video: Another class of seed plants: Angiosperms Overview of lesson

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Introduction to Angiosperms!

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quick review gymnosperms
Quick Review!Gymnosperms
  • Naked seed
  • Cones as reproductive structures
  • Thin, needle like leaves
  • Large growing plants


another class of seed plants angiosperms
Another class of seed plants: Angiosperms
  • Overview of lesson
    • Adaptive features
      • Flowers
      • Fruits
      • Unique reproductive cycle


  • Modified leaves
  • Reproductive structures
  • Allow for greater reproductive success
  • More attractive
structures of a flower
Structures of a flower
  • Petals
  • Sepal
  • Stamen
    • Anther
    • filaments
  • Pistil
    • Stigma
    • Style
    • ovary
petals sepal
  • Petals
    • Highly modified leaves
    • Brightly colored
      • Function: attract pollinators
  • Sepals
    • Enclose the flower before it opens
  • Male part of the flowers
  • contain:
    • Anther: where pollen grains are formed
    • Filament: stalk that hold anther

pistil carpal
Pistil (carpal)
  • Stigma
    • Sticky part where pollen lands
  • Style
    • Slender stalk where pollen grain reaches the ovary
  • Ovary
    • Where the ovule (egg) is contained


  • Once fertilized, ovary becomes fruit- bears seeds
    • Function: protection and dispersal of seeds

Can be either fleshy ex: peaches tomato oranges or

dry ex: nuts and raisins

types of fruits
Types of fruits
  • Simple: flower with only 1 pistil
    • Apples, tomatoes
  • Multiple: fruit formed from a cluster of flowers
  • Fruits fuse into one big mass
    • pineapples
  • Aggregate: flower with numerous pistils
    • Ex raspberries


alteration of generation review
Alteration of generation review!
  • a haploid gametophytic stage alternates (through time and generations) with a sporophytic stage
  • haploid = 1N number of chromosomes, diploid = 2N
overview of life cycle
Overview of life cycle
  • In ovule- production of megaspores (n) via meiosis
    • Megaspores ---mitosis---megagametophyte
  • In anther-production of microspores (n) via meiosis
    • Microspores----mitosis----microgametophyte (pollen grain)

overview of life cycle16
Overview of life cycle
  • Megagametophyte contains egg (n)
  • Microgametophyte (pollen) produces sperm (n)
  • Pollen (containing sperm) reaches the ovule
  • Egg and sperm meet = Fertilization
overview of life cycle17
Overview of life cycle
  • After fertilization:


embryo (2n)

  • Fruit develops

from ovary

  • Seed develops

from ovule

  • Seed germinates to

form Sporophyte

(mature plant) (2n)

double fertilization unique to flowering plants
Double fertilizationunique to flowering plants
  • Once pollen tube enters ovary
  • 1 sperm fertilizes ovule to form zygote (seed)
  • Another sperm combines with rest of ovule to form endosperm
    • Provides nourishment to developing embryo

The growing zygote ( embryo) feeds on the endospore until it grows leaves and can make its own food.


how does the pollen get to the pistil
How does the pollen get to the pistil????
  • Pollination: transfer on

pollen to plant pistil

  • Pollen dispersal agents:
    • Wind- these pollen

grains are light weight,dry and

easily blown by wind

    • Animals- ex: insects. Attracted to brightly colored and sweet smelling flower. This Pollen is sticky and adheres to animals body.
seed dispersal
Seed Dispersal
  • Seeds are dispersed away from parent for decreased competition and increased survival but how???
    • Wind- some seeds are lightweight therefore can be carried ex: dandelions
    • Water- air trapped in seeds

that allows them to float

ex: water lilies

    • Animals-
      • feed on fruit/berries
      • Stick to body-sticky,

spiny seeds