Workshop on Alternation of Generations

The scale-like structure riding on the female pine cone's woody bract.d. a flowering plantThe carpel (one to many carpels make(s) up the pistil6. A sporophyll that bears microspores is called a MICROSPOROPHYLLDescribe what this structure looks like in:a. a liverwort or mossNo true leaves, so they lack sporophyllsb. a fernSpores are bisexual; no megasporophylls are found in most species.c. a pineThe scale-like structure riding on the male pine cone's woody bract.d. a flowering plantThe stamen8. Describe the appearance of the mature male gametophyte ina. a liverwort or mossThis is the typical liverwort plant one usually sees; flattened thallus on the soil; Itwill eventually bear antheridia on stalklike antheridiophores.b. a fernSmall, fingernail-sized plant shaped like a little green valentine; bisexualc. a pinepollen graind. a flowering plantpollen grain9. Describe the appearance of the mature female gametophyte ina. a liverwort or mossThis is the typical liverwort plant one usually sees; flattened thallus on the soil; Itwill eventually bear archegonia on stalklike archegoniophores.b. a fernSmall, fingernail-sized plant shaped like a little green valentine; bisexualc. a pineA nondescript blob of undifferentiated cells except for an archegonium; found insidethe ovule (which will eventually become the seed)d. a flowering plantA coenocytic mass of cells containing eight nuclei, each of which has a specificfunction. (See diagram of the mature flowering plant's nuclei)10. In the female gametophyte, what is the name of the structure within which haploid cells developinto ova? ARCHEGONIUMDescribe what this structure looks like in:a. a liverwort or mossdifferentiated mass of cells found on the underside of the archegoniophore inliverworts, and the upper surface of the female moss gametophyte.b. a fernPhysically resembles liverwort archegonium (an ovum surrounded by haploid tissueforming a "neck," with a micropyle through which sperm swim. Found at the base ofthe valentine-shaped gametophyte's "notch."c. a pineFound inside the undifferentiated mass of cells making up the female gametophyte,and consists of haploid tissue surrounding the ovum.d. a flowering plantFemale gametophyte of flowering plants lacks an archegonium. (Derived with respectto other plants)11. In the male gametophyte, what is the name of the structure within which haploid cells developinto sperm? ANTHERIDIUMDescribe what this structure looks like in: