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Male Structures Female Structures Neither Both - PowerPoint PPT Presentation


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Male Structures Female Structures Neither Both. Male! These are stamen with white filaments & large anthers carrying pollen. Male Structures Female Structures Neither Both. Female! This is the carpel, which leads down to the ovary. Male Structures Female Structures Neither Both.

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slide1

Male Structures

  • Female Structures
  • Neither
  • Both

Male! These are stamen with white filaments & large anthers carrying pollen.

slide2

Male Structures

  • Female Structures
  • Neither
  • Both

Female! This is the carpel, which leads down to the ovary.

slide3

Male Structures

  • Female Structures
  • Neither
  • Both

Both! You can see the stamen & the carpel.

if flowers can have male female parts can they self pollinate
If flowers can have male & female parts, can they self-pollinate?

Yes!

  • Flowers can self-pollinate OR cross-pollinate.

How do plants reproduce?

alternation of generations
Alternation of Generations
  • Plants have 2 reproductive life cycles:
    • Diploid Sporophyte Generation
    • Haploid Gametophyte Generation
  • Applies to Bryophytes,

Seedless Vascular Plants,

Gymnosperms,

& Angiosperms

sporophyte gametophyte generation
Sporophyte & Gametophyte Generation
  • Our human bodies undergo meiosis to create gametes. Once an egg is fertilized, it undergoes mitosis for the baby to grow & develop.
  • Plants undergo haploid gametophyte generation to create gametes. Once fertilization occurs, the plant switches to diploid sporophyte generation to grow.
diploid 2n sporophyte generation
Diploid (2N) Sporophyte Generation
  • Familiar, recognizable form of a plant
  • Develops from a zygote
  • Cell replication through mitosis
haploid n gametophyte generation
Haploid (N) Gametophyte Generation
  • Gamete cells created from meiosis
  • Sperm & egg cells
    • Pollen & ovules
  • Combine to form a zygote, which grows into the sporophyte generation
alternation of generations1
Alternation of Generations

The actual plant that you think of is the sporophyte (2n).

The sporophyte undergoes meiosis to produce the gametophyte (1n).

The male gametophyte is pollen & the female gametophyte is the ovule.

The gametophytes (pollen & ovule) produce gametes (sperm & egg).

When gametes fuse, a new sporophyte will develop.

gametophytes
Gametophytes
  • Gymnosperms: cones
    • Pollen forms in the male pollen cones.
    • Ovules form in the female seed cones.
  • Angiosperms: flowering plants
    • Flower is the reproductive structure, with male (stamen) & female (carpel) parts
is pollen a male structure or a female structure
Is pollen a male structure or a female structure?
  • Male Structure
  • Female Structure
  • Neither
  • Both

Male! Pollen forms on the stamen.

pollination
Pollination
  • Process in which pollen is spread
  • Plants can be self-pollinated or cross-pollinated
    • Wind, insects, & animals can all help pollinate

The flower of an angiosperm helps attract birds & insects!

fertilization process where sperm from the pollen combines with an ovule
FertilizationProcess where sperm from the pollen combines with an ovule
  • 2 fertilizations occur in angiosperms (flowering plants):
    • 1 sperm nuclei fuses with an ovule to produce a diploid zygote (plant embryo).
    • A second sperm nuclei fuses with 2 polar nuclei (formed from meiosis in the ovary) to produce the endosperm.
double fertilization
Double Fertilization
  • 1st fertilization: 1 sperm nucleus combines with 1 egg nucleus = zygote (now 2n)
  • 2nd fertilization: 2 ovules have joined together in the ovary (making them diploid)
  • A second sperm nucleus will fuse with these (making it triploid, or 3n)
    • This becomes the endosperm.
anatomy of a seed
Anatomy of a Seed
  • Endosperm: food source for the plant embryo
  • Cotyledon: seed leaf of plant embryo (will become the first leaves)
  • Seed Coat: protection
which of the following does not play a direct role in sexual reproduction
Which of the following does not play a direct role in sexual reproduction?
  • Petal
  • Ovary
  • Anther
  • Style

Petals!

what is the function of the endosperm in a fertilized ovule
What is the function of the endosperm in a fertilized ovule?
  • Protect the seed from high temperatures.
  • Become the leaves of the plant.
  • Provide a food source for the seed.
  • Protect the seed from drought.

Food Source!

fruits

Video

Fruits
  • Ripened ovary that contains angiosperm seeds
    • Strawberries, peaches, apples, peas, corn, beans, cucumbers, and tomatoes

The ovary wall surrounding the fruit may be fleshy (like a grape) or tough (like a bean pod)!

vegetables
Vegetables
  • Other edible parts of a plant, like the roots, tubers, bulbs, stems, leaves, or flower parts

The part of the carrot that you eat is the root of the plant!

plant reproduction1
Plant Reproduction
  • In your groups, put the cards in the correct sequence of plant reproduction.
  • When you finish, raise your hand & I will check it!
  • Once it is correct, I will give

you your exit ticket!