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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
q define roentgen and activity and curieone roentgen 1r is described as the quantity of radiation which produces 16 times 1012 pairs of ions in 1
q what is artificial radioactivitythe phenomenon by which still light elements are made radioactive by artificial or induced methods is called
q state any three properties of the nuclear forces i a nuclear force is charge independentii a nuclear force is the strongest recognized force in
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
q what are nuclear forces the force which conquers the electrostatic repulsion between positively charged protons and binds the protons and neutrons
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
q write any three findings of binding energy curve i the binding energy per nucleon arrive at a maximum of 88 mev at a 56 corresponding to the iron
q define binding energy the energy equal of mass defect is called as binding energythere4 binding energy zmp nmn - m c2 deltam c2 here deltam is
q define 1 amuone atomic mass unit is thinks as one twelfth of the mass of carbon atom 6 c 121 amu 166 x 10 -27 kgq define mass defectthe
q tritium has a half life period of 125 years what fraction of the sample will be left over after 25 years hlp 125 yearsnumber of hlps in 25 years
q in 17 cl 35 compute the number of protons neutrons and electronsnumber of electrons 17 number of protons 17 number of neutrons
q select the pairs of isotopes isobars and isotones from the following nuclei11 na 22 12 mg 24 11 na 24 10 ne 23 isotopes are 11 na 22 11 na
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
what is the difference between amnion and chorionamnion is the membrane that covers the embryo chorion is the membrane that covers the amnion the
why can the allantois be considered an adaptation to terrestrial lifethe allantois is an adaptation to dry land because in embryos of oviparous
what are the extraembryonic membranes present in vertebrates the extraembryonic membranes that might be present in vertebrates are the yolk sac the