1. Alternation of
Generations

2. Take 5: 3/22/12 You can find seeds of conifer plants in the ______.
What cells are responsible for opening and closing stomata?
What are the two main functions of parenchyma cells?

3. Alternation of Generations
There are 2 alternating stages
_____________
&
gametophyte
sporophyte

4. Alternation of Generations
1) _____loid sporophyte produces makes spores via ___________
Dip
meiosis
2) These ____ploid spores grow into multicellular, haploid __________phytes ha
gameto

5. Alternation of Generations
3) The gametophytes produce haploid ____________ (egg & sperm)
4) The sperm fertilizes egg and the product formed is a diploid ____________ (This process is known as SEXUAL REPRODUCTION)
gametes
zygote

6. Alternation of Generations
5) Zygote grows into an embryo ________phyte
6) The fully grown mature sporophyte then produces __________ which grow into _____________ …
sporo
spores
gametophytes

7. Asexual reproduction vegetative reproduction
Most plants can also reproduce asexually (This process is called ___________________________)
These new plants are produced from the existing plant organs and have same genetic makeup as the parent plant
vegetative reproduction

8. Plant Life Cycles

9. Life Cycle of Mosses gameto protonema
The ___________phyte stage is dominant.
Haploid spore grows into a ______________ which then grows into a gametophyte.
gameto
protonema

10. Life Cycle of Mosses archaegonia antheridia
Some mosses: male and females form on separate gametophytes, others species on same gametophyte.
Has ______________ (egg-producing) & _______________ (sperm-producing)
archaegonia
antheridia

11. Life Cycle of Mosses
Fertilization requires __________ for sperm to swim
Some reproduce asexually by _____________ reproduction
water
vegetative

13. Life cycle of Ferns The ________phyte is dominant.
Ferns fronds grow from ____________ (underground stem)
sporo
rhizomes

14. Life cycle of Ferns
Clusters of sporangia are called ________ and are found on the underside of fern.
sori

15. Life cycle of Ferns Sporophyte
___________ occurs in sori to make haploid spores
When conditions are right, the sporangia open & release the spores.

16. Life cycle of Ferns
The spore germinates into a heart-shaped gametophyte called a ____________
prothallus

17. Life cycle of Ferns zygote
Antheridia and archegonia are made on the surface of the prothallus.
Sperm swim to eggs. Fertilizes it.
Diploid _________ forms and develops into sporophyte
zygote

19. Life cycle of Conifers The __________phyte is dominant.
Adult sporophyte produces male & female ___________ on separate branches of one plant
sporo
cones

20. Life cycle of Conifers Pollination Cones have sporangia on scales.
_____________ = transfer of pollen grains from male cone to female cone (wind borne)
Pollination
Female cones are larger.

22. Life cycle of Angiosperms
Like conifers, gametophyte generation is contained within sporophyte generation
Panama’s national flower