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Introduction to Angiosperms

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Animals- ex: insects. Attracted to brightly colored and sweet smelling flower. ... ex: water lilies. Animals- feed on fruit/berries. Stick to body-sticky, spiny seeds ... – PowerPoint PPT presentation

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Title: Introduction to Angiosperms


1
Introduction to Angiosperms!
"Flowering Plants"
2
Overview
3
Quick Review!Gymnosperms
  • Naked seed
  • Cones as reproductive structures
  • Thin, needle like leaves
  • Large growing plants

Video http//www.youtube.com/watch?vph7Ex8rQ-IA
4
Another class of seed plants Angiosperms
  • Overview of lesson
  • Adaptive features
  • Flowers
  • Fruits
  • Unique reproductive cycle

5
(No Transcript)
6
Flowers
  • Modified leaves
  • Reproductive structures
  • Allow for greater reproductive success
  • More attractive

7
Structures of a flower
  • Petals
  • Sepal
  • Stamen
  • Anther
  • filaments
  • Pistil
  • Stigma
  • Style
  • ovary

8
Petals/Sepal
  • Petals
  • Highly modified leaves
  • Brightly colored
  • Function attract pollinators
  • Sepals
  • Enclose the flower before it opens

9
Stamen
  • Male part of the flowers
  • contain
  • Anther where pollen grains are formed
  • Filament stalk that hold anther

http//faculty.clintoncc.suny.edu/faculty/Michael.
Gregory/files/Bio20102/Bio2010220lectures/Seed
20Plants/seed20plants.htm
10
Pistil (carpal)
  • Stigma
  • Sticky part where pollen lands
  • Style
  • Slender stalk where pollen grain reaches the
    ovary
  • Ovary
  • Where the ovule (egg) is contained

11
Fruits!
  • 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

12
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

13
Reproduction!
biology.clc.uc.edu/courses/bio106/angio.htm
14
Alteration of generation review!
  • a haploid gametophytic stage alternates (through
    time and generations) with a sporophytic stage
  • haploid 1N number of chromosomes, diploid 2N

15
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)

http//faculty.clintoncc.suny.edu/faculty/Michael.
Gregory/files/Bio20102/Bio2010220lectures/Seed
20Plants/seed20plants.htm
16
Overview of life cycle
  • Megagametophyte contains egg (n)
  • Microgametophyte (pollen) produces sperm (n)
  • Pollen (containing sperm) reaches the ovule
  • Egg and sperm meet Fertilization

17
Overview of life cycle
  • After fertilization
  • zygotes
  • embryo (2n)
  • Fruit develops
  • from ovary
  • Seed develops
  • from ovule
  • Seed germinates to
  • form Sporophyte
  • (mature plant) (2n)

http//www.ualr.edu/botany/botimages.html
18
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

19
  • The growing zygote ( embryo) feeds on the
    endospore until it grows leaves and can make its
    own food.

20
Quiz!
http//www.cartage.org.lb/en/themes/Sciences/Botan
icalSciences/PlantReproduction/Angiosperms/Angiosp
erms.htm
21
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.

22
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
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