• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Reproductive structures
 

Reproductive structures

on

  • 693 views

 

Statistics

Views

Total Views
693
Views on SlideShare
693
Embed Views
0

Actions

Likes
0
Downloads
87
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Reproductive structures Reproductive structures Presentation Transcript

    • 9/4/2013 1 REPRODUCTIVE STRUCTURES OBICO JJA, Instructor Department of Biology, UP Manila FLOWER Reproductive organ of angiosperms Angiosperms- flowering plants Modified shoot with four whorls SEPALS- calyx PETALS ll Non-reproductive parts PETALS- corolla STAMENS- androecium PISTILS- gynoecium Non reproductive parts Reproductive parts PISTILPISTIL STAMENSTAMEN antheranther filamentfilament stylestyle stigmastigma Parts of a flowerParts of a flower ovaryovary ovuleovule receptaclereceptacle pedicelpedicel SEPALSEPAL PETALPETAL Parts of a flowerParts of a flower FLORAL VARIATION Complete and Incomplete Perfect and Imperfect (Bisexual and Unisexual) Unisexual flowers- either pistillate/ carpellate or staminate Monoecious and DioeciousMonoecious and Dioecious
    • 9/4/2013 2 MITOSIS AND MEIOSIS ALTERNATION OF GENERATION
    • 9/4/2013 3 Carpels and stamens Contain the sporangia Sporangium Contains the spores Chambers here male and female gametoph tesChambers where male and female gametophytes develop Male gametophyte Sperm-containing pollen grain Female gametophyte Egg-containing structures called embryo sacs Embryo sac develop within the ovules Development of male gametophyte (Pollen) Development of female gametophyte (Embryo) Pollination
    • 9/4/2013 4 integument funiculus micropyle POLLINATION
    • 9/4/2013 5 SEED Contains a miniature plant Seed Dormancy Very low metabolic rate Not growing and developing Ensures that germination ill occur at a time andEnsures that germination will occur at a time and place most advantageous to the seedling Germination Resumption of growth and development
    • 9/4/2013 6 SEED GERMINATION Imbibition Seed coat expand and ruptures Activation of digestive enzymes Mobilization of nutrients Radicle- first structure to emerge Types: Epigeal Hypogeal FRUIT Mature ovary As seed develops after fertilization, the ovary wall thickens Protects the enclosedProtects the enclosed seed Other floral parts wither Variation in fruits Aid in their dispersal
    • 9/4/2013 7 FROM OVARY TO FRUIT A fruit Develops from the ovary Protects the enclosed seeds Aids in the dispersal of seeds by wind or animals Fruits are classified into several types Depending on their developmental origin Stamen Carpels Flower Ovary Stigma Stamen Figure 38.9a–c Simple fruit. A simple fruit develops from a single carpel (or several fused carpels) of one flower (examples: pea, lemon, peanut). (a) Aggregate fruit. An aggregate fruit develops from many separate carpels of one flower (examples: raspberry, blackberry, strawberry). (b) Multiple fruit. A multiple fruit develops from many carpels of many flowers (examples: pineapple, fig). (c) Pineapple fruitRaspberry fruit Pea fruit Stamen Carpel (fruitlet) Stigma Ovary Raspberry flower Each segment develops from the carpel of one flower Pineapple inflorescence Ovule Pea flower Seed FRUIT TYPES Based on Developmental Origin Simple- single ovary Aggregate- single flower with several unfused carpels Multiple - inflorescence B d T t f th P iBased on Texture of the Pericarp Dry Indehiscent Dehiscent Fleshy Pericarp has visible layers Exocarp Mesocarp Endocarp Fleshy Fruit Pericarp FLESHY FRUIT PERICARP
    • 9/4/2013 8
    • 9/4/2013 9 FRUIT AND SEED DISPERSAL Anemochory: Dispersal by wind. Autochory: Dispersal by physical expulsion, often explosively. Endozoochory: Dispersal through animal ingestion and excretioningestion and excretion. Epizoochory: Dispersal by attachment to fur or feathers. Hydrochory: Dispersal by water. Myrmecochory: Dispersal by ants.
    • 9/4/2013 10 DISPERSAL OF FRUITS AND SEEDS