Question

Organism 3

Field Notes: Specimen collected from shaded area along stream in South Cumberland State Park (Grundy County, TN)
Laboratory Analysis:
Body: Large leaves emerging from underground rhizome
Size: 63cm

Chromosomal Analysis: Plant body is diploid --chromosomes number of 44

Lignin test: Positive

Cuticle: Present

Leaves: Present -- large with branched veins. Underside has sori(containing haploid spores)
Roots: Present-----branch from the inside
Stem:Present--- vascular tissue(xylem and phloem)present



Life History: Diploid sporophyte dominant generation. Haploid spores germinate into heart-shaped, haploid, gametophyte. Water required for fertilization due to flagellated sperm; no seed is produced. Diploid zygote develops into sporophyte of life ---each bearing ether megasporangia or microsporangia but not both. Insects, especially beetles, appear important in pollination   

Question: Explain which domain, kingdom and phylum you believe this plant should be classified in.

Communication: The local media features the work of your team on their nightly news. During a live interview the reporter asks you " Apparently this plant requires water for fertilization, can you explain, can you explain why"?

Response: ------------------------

Answer 1

Domain- eukarya:-their cells contains nuclei

kingdom- Plantae:-they contain chlorophyll for photosynthetic and cell walls

phylum:-Pteridophyta

pteridophyte are seedless, vascular plants having sporophytic plant body

grow in marsh and damp places

differentiated plant body into root, stem, leaves.

leaves:-microphyll and megaphyll

main plant bear sporangia, these bear some leaf-like appendages called sporophyll. sporophyte form compact structures cones called strobili

show true alternation of generation:-the dominant sporophyte produces spores through mitosis. the gametophyte generation forms gamete by meiosis.the spores are produced by the sporangia in the spore mother cell. these spores germinate and give rise to the gametophyte.

these gametophytes are free-living, multicellular, photosynthetic

gametophyte require a damp and cool place to grow dependence of water. water serves as the medium for the male gametes to to fuse with the female gamete

Azolla, Salvinia, marsilea are aquatic so they are in the water.sperms are bi or multi-flagellated as they require external water supply in order to reach archegonia

hence the gametophytic phase of pteridophyte require water for reproduction in order to reach the gametes to archegonia and sperms are flagellated