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q what are the four major groups into which the study of the plants is dividedin botany the plant kingdom is divided into pteridophytes bryophytes
q what is the difference between tracheophytes and bryophytesbryophytes are nonvascular plants liverworts mosses hornworts that is they do not have a
q what are the subkingdoms into which the plant kingdom is dividedthe kingdom plantae is divided into two big subkingdoms the tracheophytes and the
q do plants have tissue organization and specialized organsplants have specialized organs like roots limbs reproductive organs leaves and
q how different are animal cells from plant cellswhile plant cells are eukaryotic photosynthetic autotrophic and have chloroplasts and cell wall the
q what are the major cellular features of the beings of the plant kingdomthe typical plant cells are eukaryotic have nucleus photosynthetic use light
q what is the function of the umbilical cordthe umbilical cord is a set of blood vessels that connects the fetus with the placenta and in the fetus
q what are the endocrine functions of the placentathe placenta has endocrine function since it secretes the hormones estrogen and progesterone that
q is there an exchange of cells between the mother and the fetus through the placentaunder usual conditions there is no passage of cells across the
q what are the major substances transferred from the mother to the fetus through the placenta and from the fetus to the motherfrom the mother to the
q in which kind of animals does the placenta exist what is its major functiontrue placenta is present in placental mammalsthe placenta is formed from
q what is the chorioallantois membrane present in the embryonic development of birds and reptiles how does this membrane participate in the energetic
q why can the amnion also be considered an adaptation to terrestrial lifethe amnion is as well an adaptation to dry land since one of its functions
q what is the difference between amnion and chorionamnion is the membrane that covers the embryo and chorion is the membrane that covers the amnion
q why can the allantois be considered an adaptation to terrestrial lifethe allantois is an adaptation to dry land because in embryos of oviparous
q which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo is this function present in placental mammalian
q how is the yolk sac formed what is the function of the yolk sacthe yolk sac is formed from the covering of the vitellus by few cells originated
q are the extraembryonic membranes the same in all vertebratesthe presence of each extraembryonic membrane differs according to the vertebrate
q what are the extraembryonic membranes present in vertebratesthe extraembryonic membranes that may be present in vertebrates are the yolk sac the
q what are extraembryonic membranesextraembryonic membranes are membranous structures that appear in parallel with the embryo and play vital roles in
q what is polyembryonypolyembryony is the phenomenon in which a single embryo in its initial embryonic stage divides itself forming many new
q what are twins genetically what are the two types of twins that can be generatedtwins are at the same time generated within the mothers uterus
q from which germ layer do the liver and the pancreas originate what are other organs and tissues made from that germ layerthe pancreas and the liver
q from which germ layer do blood cells originate what are other organs and tissues made from that germ layerblood cells have a mesodermal embryonic
q from which germ layer do the epidermis and the nervous system originate what are other organs and tissues made from that germ layerepidermis and