Plant Life Cycles

1. Plant Life Cycles

2. Meiosis Review • Cell starts diploid • Ex: Human = 46 chromosomes • Cell divides twice to create 4 cells • End result: Haploid cells • Ex: Human = 23 chromosomes • Cells created: Sperm, egg, pollen

3. Alternation of generations (In general) • Diploid zygote created • Diploid zygote grows into a diploid sporophyte • Haploid spores created by meiosis • Haploid spores grow into haploid gametophytes • Male gametophyte creates haploid sperm • Female gametophyte creates haploid egg • Sperm and egg fuse to make a diploid zygote • Cycle restarts

4. Moss Life Cycle

5. 1)Moss gametophytes grow near the ground (haploid stage) 2) Through water, sperm from the male gametophyte will swim to the female gametophyte to create a diploid zygote 3) Diploid sporophyte will grow from zygote 4) Sporophyte will create and release haploid spores . . . . . sporophyte egg zygote zygote egg egg zygote egg zygote male male gametophyte female female female male female male

6. 5) Haploid spores land and grow into new gametophytes 6) The process repeats . . . . . ground gametophyte

7. . . . . . sporophyte egg zygote egg zygote egg zygote egg zygote male male gametophyte female female female male female male

8. 5) Haploid spores land and grow into new gametophytes 6) The process repeats . . . . . ground gametophyte

9. Fern Life Cycle

10. 1) Sporophyte creates and releases haploid spores . . . . Adult Sporophyte (diploid) ground

11. 2) Haploid spores land in the soil . . . . ground

12. 3) From the haploid spores, gametophyte grows in the soil Let’s zoom in ground

13. 4) Sperm swim through water from the male parts (antheridium) to the female parts (archegonia) Let’s zoom back out egg zygote egg zygote egg zygote

14. 5) Diploid sporophyte grows from the zygote sporophyte ground

15. 6) Fronds uncurls into leaves. 7) Cycle repeats -- Haploid spores created and released . . . . ground

16. 1) Sporophyte creates and releases haploid spores . . . . Adult Sporophyte (diploid) ground

17. 2) Haploid spores land in the soil . . . . ground

18. 3) From the haploid spores, gametophyte grows in the soil Let’s zoom in ground

19. 4) Sperm swim through water from the male parts (antheridium) to the female parts (archegonia) Let’s zoom back out egg zygote egg zygote egg zygote

20. 5) Diploid sporophyte grows from the zygote sporophyte ground

21. 6) Fronds uncurls into leaves. 7) Cycle repeats -- Haploid spores created and released . . . . ground

22. Conifer Life Cycle

23. 1) Male and female seed cones grow in adult sporophytes

24. 2) Pollen grains released from the male seed cones -- Pollen is the male gametophyte Male cones make pollen Female cones make eggs egg zygote egg zygote egg zygote egg zygote

25. seed seed seed seed 3) Seeds begin to harden inside the female cones

26. 4) Seeds released

27. 5) Seed will land ground

28. 6) Seedling grows into (sporophyte)…the cycle repeats ground

29. 1) Male and female seed cones grow in adult sporophytes

30. Male cones make pollen Female cones make eggs egg zygote egg zygote egg zygote egg zygote

31. seed seed seed seed 3) Seeds begin to harden inside the female cones

32. 4) Seeds released

33. 5) Seed will land ground

34. 6) Seedling grows into (sporophyte)…the cycle repeats ground

35. Angiosperm Life Cycle

36. Pollen stick to animal or released into wind

37. Animal finds a new flower to feed on

38. Pollen transferred to the stigma….seeds develop egg zygote

39. Fruit ripens to help disperse seeds zygote

40. Fruit falls to ground

41. Animals eat fruit….seeds come out the other end…cycle repeats seed

42. Pollen stick to animal or released into wind

43. Animal finds a new flower to feed on

44. Pollen transferred to the stigma….seeds develop egg zygote

45. Fruit ripens to help disperse seeds zygote

46. Fruit falls to ground

47. Animals eat fruit….seeds come out the other end…cycle repeats seed

48. End of the Semester!