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how are gametes formed in the pteridophyte life cycle by mitosis or meiosis what is the type of meiosis that occurs in pteridophytesin pteridophytes
what is the structure of the adult fern within which cells undergoing meiosis can be foundin these plants meiosis takes place within structures known
what are the main parts of fernsferns are constituted by small roots that come downwards from the rhizome stem often orizontalized the fronds also
what is the evolutionary importance of pteridophytesas the first tracheophytes pteridophytes were also the first plants to extensively colonize the
how different are pteridophytes from bryophytes regarding substance transport pteridophytes are tracheophyte vascular plants ie they have tissues
what are the main representatives of the pteridophytes is this plant group cryptogamic or phanerogamicthe better known pteridophytes are the ferns
what is the life cycle type of bryophytesas in all plants the life cycle of bryophytes is diplobiontic alternation of generations in bryophytes the
how is the transport of substances done across the bryophyte tissues how is this feature related to the general size of these plants in bryophytes
what are the main bryophyte groups the main bryophyte groups are the mosses the liverworts and the hornwortsimage diversity mosses liverworts
what are the main characteristics of the bryophytesbryophytes are nonvascular plants ie they do not have conductive tissues and they perform
why is the plant life cycle known as alternation of generationsthe plant life cycle is called as alternation of generations because in this cycle
what respectively are zygotic meiosis gametic meiosis and sporic meiosiszygotic meiosis is the one that happens in the haplontic haplobiontic life
what are the three basic sexual life cycles studied in biology which of them corresponds to metagenesis which of them is the human life cyclesexual
what are the two divisions of the angiospermsthe angiosperms are separated into monocotyledonous and dicotyledonous these categories are defined
what is the difference among cryptogamic and phanerogamic plants cryptogamic hidden sex organs plants are those that do not show flowers or seeds
what is the difference between bryophytes and tracheophytesbryophytes are nonvascular plants mosses hornworts liverworts ie they do not have a
what are the subkingdoms into which the plant kingdom is dividedthe kingdom plantae is separated into two big subkingdoms the bryophytes and the
do plants have tissue organization and specialized organs plants have specialized organs as reproductive organs roots limbs leaves and differentiated
how different are animal cells from plant cellswhereas plant cells are eukaryotic autotrophic photosynthetic and have chloroplasts and cell wall the
what is the function of the umbilical cord the umbilical cord is a set of blood vessels that connects the fetus with the placenta in the fetus one
what are the endocrine functions of the placentathe placenta has endocrine function since it secretes the hormones progesterone and estrogen that
is there a exchange of cells between the mother and the fetus through the placenta under normal conditions there is not a passage of cells across the
what are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother from the mother to the
in which type of animals does the placenta exist what is its main functiontrue placenta is present in placental mammalsthe placenta is produced from
why can the amnion also be considered an adaptation to terrestrial lifethe amnion is also an adaptation to dry land since one of its functions is to