Units 20

1
Units 20 21Seedless Plants

• Biology 1407
• Collin College

2
(No Transcript)
3
On previous episodes we learned

• Haploid one set of chromosomes
• Diploid two sets of chromosomes

4
On previous episodes we learned

• Mitosis
• division of the cells nucleus resulting in
• two daughter nuclei

5
On previous episodes we learned

• Meiosis
• process in which a diploid cell undergoes two
  successive nuclear divisions potentially
  producing four nuclei
• (spores)

6
On previous episodes we learned

• Gametophyte
• gamete producing stage (sex cells, n)
• haploid
• Sporophyte
• spore producing stage (2n)
• diploid

7
What brings these two teams together

• What brings these two teams together
• The basic plant life cycle

8
What brings these two teams together

• Plants have an alternation of generations
• The life cycle of all land plants alternate
  between 2 generations
• Gametophytes and sporophytes
• Each generation giving rise to the next

9
What brings these two teams together

• So a plant walks into a bar
• Remember, its a Lifecycle

10
Todays challenge

• Adaptation to life on land!

11
Todays challenge

• Team Moss
• Amphibians of the plant kingdom
• Tropics to Arctic
• No vascular tissue
• Root-like
• Stem-like
• Leaf-like

12
Todays challenge

• Gametophyte phase of Reproduction is dominant.
• -What we recognize as the plant

13
Todays challenge

• In mosses, the leaf-like gametophyte shoots bear
  either antheridia or archegonia, where gametes
  are produced

14
Todays challenge

• The female gametophyte produces eggs in the
  archegonia

15
Todays challenge

• The male gametophyte produces flagellated sperm
  in antheridia

16
Todays challenge

• On maturation
• The sperm swims to the egg and fertilization
  occurs(must have water)

17
Todays challenge

• After fertilization
• Meiosis occurs and spores are produced.
• Spores are spread by the wind.

18
Todays challenge

• Immunities earned by Team Moss
• Soil formation
• Erosion
• Historical
• WWI
• Commercial
• Peat moss
• Surf boards

19
Todays challenge

• Team Fern
• Vascular tissue present
• Phloem and xylem
• most important adaptation
• Temperate regions to Arctic Circle

20
Todays challenge

• Sporophyte phase of reproduction is dominant
• - What we recognize as the plant

21
Todays challenge

• On the undersurface of the ferns fronds cells
  undergo meiosis to create haploid cells (spores)

22
Todays challenge

• The spore develops into a gametophyte that can
  produce both sperm and eggs
• ProthallusThe love pad

23
The love pad
24
Todays challenge

• The sperm and egg unite in the processes called
  fertilization, producing a "baby" fern called a
  zygote
• which now has two copies of each chromosome (it
  is diploid)

25
Todays challenge

• By normal cell division, this grows into the fern
  as we know it.
• The fern produces the spore and the cycle
  continues.

26
Todays challenge

• Immunities earned by Team Fern
• Commercial
• Arrangements
• Medical
• Intestinal parasites
• Scientific
• Hunger buster
• Air quality

27
Recap todays episode

• Team Moss
• Gametophyte phase of reproduction
• is dominant.
• No vascular tissue
• Soil formation
• Erosion
• Historical
• WWI
• Commercial
• Peat moss

• Team Fern
• Sporophyte phase of reproduction
• is dominant.
• Vascular tissue present
• Commercial
• Arrangements
• Medical
• Intestinal parasites
• Scientific
• apical meristems
• EPA

28
The winner of SurvivorPlantae

• TEAM FERN
• Todays vascular plants dominate the natural
  landscape in almost all of the earths
  terrestrial habitats.