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5 Written questions

5 Matching questions

  1. Chorion
  2. Indeterminate cleavage
  3. Chordate
  4. Fertilization
  5. Endoderm
  1. a (membrane of eggs) lines the inside of the shell; it is a moist membrane that permits gas exchance
  2. b fter the initial cell division the fate of the resulting daughter cells is not determined -- each has the potent ial to develop into an entire organism. Sometimes this occurs; resulting individuals are genetically identical (in humans, they are called identical twins)
  3. c the innermost of the three primary germ layers in animal embryos; lines the archeenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures
  4. d member of the phylum chordata, aimals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail
  5. e an egg can be fertilized within 12-24 hours after ovulation; fertilization occurs in the lateral, widest portion of the oviduct when sperm traveling from the vagina encounter an egg; if more than one egg is fertilized, fraternal twins may be conceived

5 Multiple choice questions

  1. a developing human from the 9th week of gestation until birth; has all the major structures of an adult
  2. The cord that connects the developing embryo or fetus with the placenta and through which run the umbilical arteries and vein. The matrix (the substance) of the umbilical cord is known as Wharton's jelly and is a rich source of stem cells. At birth the umbilical cord measures about 20 inches (50 cm) in length. The cord is clamped and cut after birth and its residual tip forms the umbilicus (bellybutton).
  3. a longitudinal, flexible rod made of tightly packed mesodermal cells that runs along the anterior-posterior axis of a chordate (member of the phylum chordata) in the dorsal part of teh body
  4. during the first weeks, the major organs begin to develop; the heart begins to beat at approximately 22 days, and soon afterwards, the eyes, gonads, limbs, and liver start to form; by five weeks the embryo is 10mm in lenght; by six weeks the embryo has grown to 15mm; the cartilaginous skeleton begins to turn into bone by the seventh week; by the end of eight weeks, most of teh organs have formed, the brain is fairly developed, and the embryo is referred to as a fetus; at teh end of teh third month, the fetus is about 9 cm long
  5. the outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lense of the eye

5 True/False questions

  1. Placentaa structure in the pregnant uterus for nourishing a vivaparous fetus with the mother's blood supply; formed from the uterine lining and the embryonic membranes

          

  2. Growththe organs increase in size, which is a continual process from infancy to childhood to adulthood

          

  3. Nonplacental internal developmentearly development within the body of the mother protects the young; certain animals, including marsupials and some tropical fish, develop in the mother without a placenta; without a placenta, exchange of food and oxygen between teh young and the mother is limited; the young may be born very early in development

          

  4. Internal developmentfollows the neurulation process; includes organogenesis, growth, and gametogenesis

          

  5. Yolk sac(membrane of eggs) encloses the yolk; blood vessels in the yolk sac transfer food to the developing embryo

          

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