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Parts of a Flower
Unit Four, Lesson 4.2
By Margielene D. Judan
Lesson Outline
 Introduction: Sexual Reproduction
 Flowering Plants
 Parts of a Flower
Reproduction
 Reproduction is the creation of “new
individuals” from existing individuals.
Two Types of Reproduction
 Sexual – involves sex cells (egg, sperm)
 Asexual – does not involve sex cells
Refer to p.125
In asexual
reproduction, the
parent cell is SINGLE
AND DIVIDING.
(ex. amoeba, hydra,
fungi, bacteria, etc.)
Refer to p.125
In sexual reproduction,
the offspring are
genetically identical
(exact clones) to their
parents.
(ex. humans,
elephants, dogs, fishes,
plants, etc.)
Sexual Reproduction
 Involves union of gametes
 Gametes = sperm (male) +
egg (female)
 Trivia: The egg is the largest
cell in the human body
while the sperm is the
smallest.
Sexual Reproduction
 Sperm – mobile and small
 Egg – immobile and large
 During fertilization, they
unite (n + n) to form a
diploid (2n) zygote
(fertilized egg)
Nonflowering Plants
 They are called gymnosperms (we will not
discuss them).
Flowering Plants
 Comprises 90% of plant species
 Classified as either:
1. Angiosperms – have seeds enclosed in
ovary
2. Anthophytes – plants that produce flowers.
They have an ovary that’s part of the
flower
Flowers
 Reproductive organs/structures of a plant
 Most flowers are hermaphrodites (contains
both male and female sex organs)
Parts of a Flower
 Corolla
 Calyx
 Stamen (male)
 Pistil (female)
 Receptacle
 Peduncle
(Be sure to be able to memorize and label each part)
Accessory Parts – function mainly for
support, protection and attraction
• Corolla
• Calyx
• Receptacle
• Peduncle
Corolla
 Comprises of the
petals
 Have various
shapes, sizes, and
colors
 Function:
protection,
attraction
Calyx
 Comprises of
sepals (typically
green)
 Leaf-like
 Function: Protect
the flower when
it was still young
sepal
Receptacle
 Also called torus
 Function:
Supports the
entire flower
(base of the
flower)
receptacle
calyx
Peduncle
 Also called stalk
 Function:
Connects the
flower to the
branch or stem.
peduncle
Reproductive Parts – for reproduction;
main parts of a flower
1. Stamen (male)
2. Pistil (female)
Stamen
 The male reproductive
organ
 Collectively called
androecium (collective
noun)
 Composed of two parts:
1. Anther
2. Filament
Anther
 Expanded lobular
structure at the
end of the
filament
 Function:
Produces pollen
(male sex cell)
Filament
 Function: Stalk
that supports and
holds the anther
Pistil or carpel
 The female reproductive
organ
 Collectively called
gynoecium (collective noun)
 Composed of three parts:
1. Stigma
2. Style
3. Ovary
Stigma
 Swollen tip of the
pistil
 Function:
Covered by sticky
substance for
pollen grains to
adhere (stick) to
stigma Pollen grains
(purple dots)
Style
 Function: Long,
slender tube that
connects the
stigma to the
ovary
 Acts as a
conveyor (carrier
from one place to
another) of pollen
grains
style
Ovary
 Enlarged basal
portion of the
pistil
 Function: Houses
the ovule
 The ovule houses
the egg cell
Ovary
In cross section, internal parts of the ovary can
be seen:
Carpel
Locule
Ovule
Funiculus
Placenta
Ovary
Carpel –
segment or
partition that
comprises an
ovary
Ovary wall –
supports the
ovary Ovary with 3 carpels
Ovary
Locule – space
or cavity within
the carpel
An ovary with 3
carpels has also
3 locules
room-like locules
ovules
(2 ovules
per
locule)
Cross-section of a
plant ovary carpel
Ovary
Ovary core –
solid structure
at the center
Placenta – the
edge of the
core; nourishes
the egg
core (yellow);
placenta (green)
Visual representation
core
placenta
placenta
core
Ovary
Finuculus –
short stalk that
connects the
ovule and
placenta
finiculus
finiculus
Ovary
Ovule –
produces the
egg
(2 ovules per
lenticel)
ovule
ovule
ovule
Cross-section of an ovule
The ovule has the following parts:
1. Integument - 2 layer protective coat
2. Nucellus – mass of tissue consisting of
meristematic (dividing) cells
3. Funiculus
4. Embryo sac – contains the egg
(ovary sac) (ovary sac)
Development of Gametophytes
(Egg) Two Stages
1. Megasporogenesis (genesis = beginning/creation) –
creation of megaspores
2. Megagametogenesis – creation of the gametes (egg)
Development of Gametophytes
(Egg)
1. Megasporogenesis
A. Ovule produces megaspore
mother cell (2n).
B. Megaspore mother cell
(2n) produces 4
megaspores (n) via a two-
time meiosis.
C. 3 megaspores die and only
one is left to continue.
2n
n n
meiosis
n n
meiosis
n n
meiosis
Development of Gametophytes
(Egg)
1. Megagametogenesis
A. The surviving
megaspore divides
via mitosis 3 times,
forming 8 haploid
(n) cells)
n megaspore
n n
n n n n
nnnnnnnn
mitosis
mitosis mitosis
mitosismitosismitosismitosis
8 haploid (n) cells
Egg Development in Ovule
B. Among the eight cells:
 3 cells migrate near the micropyle.
The one at the center becomes the
egg while the other two becomes
the synergid cells.
 The other 3 migrate on the opposite
pole and become antipodal cells.
 The remaining 2 cells are naked (no
membrane) and remains at the
center to become the polar nuclei.
micropyle
egg
synergidsynergid
antipodal
polar nuclei
Egg Development in Ovule
C. These 8 cells form
the inside of the
embryo sac and are
ready to be
fertilized by a
pollen (from the
male).
Pollen Development in the
Anther (Male)
Like egg development, pollen
development undergoes meiosis and
mitosis to produce pollen grains.
The product is 2 pollen grains.
1. Microsporogenesis – creation of
microspore
2. Microgametosgenesis – creation
of male gametes (pollen)
Assignment:
p. 143 (Check Your Knowledge A: #s 1-10)
Sources:
 Science Links 7

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Unit 4, Lesson 4.2 - Parts of a Flower

  • 1. Parts of a Flower Unit Four, Lesson 4.2 By Margielene D. Judan
  • 2. Lesson Outline  Introduction: Sexual Reproduction  Flowering Plants  Parts of a Flower
  • 3. Reproduction  Reproduction is the creation of “new individuals” from existing individuals.
  • 4. Two Types of Reproduction  Sexual – involves sex cells (egg, sperm)  Asexual – does not involve sex cells
  • 5. Refer to p.125 In asexual reproduction, the parent cell is SINGLE AND DIVIDING. (ex. amoeba, hydra, fungi, bacteria, etc.)
  • 6. Refer to p.125 In sexual reproduction, the offspring are genetically identical (exact clones) to their parents. (ex. humans, elephants, dogs, fishes, plants, etc.)
  • 7.
  • 8. Sexual Reproduction  Involves union of gametes  Gametes = sperm (male) + egg (female)  Trivia: The egg is the largest cell in the human body while the sperm is the smallest.
  • 9. Sexual Reproduction  Sperm – mobile and small  Egg – immobile and large  During fertilization, they unite (n + n) to form a diploid (2n) zygote (fertilized egg)
  • 10. Nonflowering Plants  They are called gymnosperms (we will not discuss them).
  • 11. Flowering Plants  Comprises 90% of plant species  Classified as either: 1. Angiosperms – have seeds enclosed in ovary 2. Anthophytes – plants that produce flowers. They have an ovary that’s part of the flower
  • 12. Flowers  Reproductive organs/structures of a plant  Most flowers are hermaphrodites (contains both male and female sex organs)
  • 13. Parts of a Flower  Corolla  Calyx  Stamen (male)  Pistil (female)  Receptacle  Peduncle (Be sure to be able to memorize and label each part)
  • 14.
  • 15. Accessory Parts – function mainly for support, protection and attraction • Corolla • Calyx • Receptacle • Peduncle
  • 16. Corolla  Comprises of the petals  Have various shapes, sizes, and colors  Function: protection, attraction
  • 17. Calyx  Comprises of sepals (typically green)  Leaf-like  Function: Protect the flower when it was still young sepal
  • 18. Receptacle  Also called torus  Function: Supports the entire flower (base of the flower) receptacle calyx
  • 19. Peduncle  Also called stalk  Function: Connects the flower to the branch or stem. peduncle
  • 20. Reproductive Parts – for reproduction; main parts of a flower 1. Stamen (male) 2. Pistil (female)
  • 21. Stamen  The male reproductive organ  Collectively called androecium (collective noun)  Composed of two parts: 1. Anther 2. Filament
  • 22. Anther  Expanded lobular structure at the end of the filament  Function: Produces pollen (male sex cell)
  • 23. Filament  Function: Stalk that supports and holds the anther
  • 24. Pistil or carpel  The female reproductive organ  Collectively called gynoecium (collective noun)  Composed of three parts: 1. Stigma 2. Style 3. Ovary
  • 25. Stigma  Swollen tip of the pistil  Function: Covered by sticky substance for pollen grains to adhere (stick) to stigma Pollen grains (purple dots)
  • 26. Style  Function: Long, slender tube that connects the stigma to the ovary  Acts as a conveyor (carrier from one place to another) of pollen grains style
  • 27. Ovary  Enlarged basal portion of the pistil  Function: Houses the ovule  The ovule houses the egg cell
  • 28. Ovary In cross section, internal parts of the ovary can be seen: Carpel Locule Ovule Funiculus Placenta
  • 29. Ovary Carpel – segment or partition that comprises an ovary Ovary wall – supports the ovary Ovary with 3 carpels
  • 30. Ovary Locule – space or cavity within the carpel An ovary with 3 carpels has also 3 locules room-like locules
  • 32. Ovary Ovary core – solid structure at the center Placenta – the edge of the core; nourishes the egg core (yellow); placenta (green) Visual representation core placenta placenta core
  • 33. Ovary Finuculus – short stalk that connects the ovule and placenta finiculus finiculus
  • 34. Ovary Ovule – produces the egg (2 ovules per lenticel) ovule ovule ovule
  • 35.
  • 36.
  • 37. Cross-section of an ovule The ovule has the following parts: 1. Integument - 2 layer protective coat 2. Nucellus – mass of tissue consisting of meristematic (dividing) cells 3. Funiculus 4. Embryo sac – contains the egg
  • 39. Development of Gametophytes (Egg) Two Stages 1. Megasporogenesis (genesis = beginning/creation) – creation of megaspores 2. Megagametogenesis – creation of the gametes (egg)
  • 40. Development of Gametophytes (Egg) 1. Megasporogenesis A. Ovule produces megaspore mother cell (2n). B. Megaspore mother cell (2n) produces 4 megaspores (n) via a two- time meiosis. C. 3 megaspores die and only one is left to continue. 2n n n meiosis n n meiosis n n meiosis
  • 41. Development of Gametophytes (Egg) 1. Megagametogenesis A. The surviving megaspore divides via mitosis 3 times, forming 8 haploid (n) cells) n megaspore n n n n n n nnnnnnnn mitosis mitosis mitosis mitosismitosismitosismitosis 8 haploid (n) cells
  • 42. Egg Development in Ovule B. Among the eight cells:  3 cells migrate near the micropyle. The one at the center becomes the egg while the other two becomes the synergid cells.  The other 3 migrate on the opposite pole and become antipodal cells.  The remaining 2 cells are naked (no membrane) and remains at the center to become the polar nuclei. micropyle egg synergidsynergid antipodal polar nuclei
  • 43.
  • 44. Egg Development in Ovule C. These 8 cells form the inside of the embryo sac and are ready to be fertilized by a pollen (from the male).
  • 45.
  • 46. Pollen Development in the Anther (Male) Like egg development, pollen development undergoes meiosis and mitosis to produce pollen grains. The product is 2 pollen grains. 1. Microsporogenesis – creation of microspore 2. Microgametosgenesis – creation of male gametes (pollen)
  • 47.
  • 48. Assignment: p. 143 (Check Your Knowledge A: #s 1-10)