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MIDTERM 1 BIOL 204 UBCO
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MIDTERM 1 QUESTIONS AND QUESTION, MCQs, CRITICAL THINKING QUESTIONS WITH SOLUTION
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Biology 204Midterm – October 2021
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This exam is printed double-sided. Total = 45
1
, 1. Comparing the blastocoel in frogs and chickens:
In frogs, the blastocoel is the space between the epiblast and the hypoblast, while in chick embryos, the
blastocoel is lined by endoderm, mesoderm, and ectoderm
In chick embryos, the blastocoel is found between the epiblast and hypoblast, while the blastocoel in frogs is
lined by germ layers
In chick embryos, the blastocoel is displaced by gastrulation, but in frog embryos the blastocoel remains as
an internal body cavity
In the frog embryo, the blastocoel is displaced by gastrulation, but in chick embryos the blastocoel becomes
the space between the extra-embryonic membranes
In frogs, the blastocoel is displaced as cells migrate through the primitive streak, whereas in chick embryos,
the blastocoel is displaced as cells migrate through the blastopore
2. All chordates possess the following characteristics at some stage in their development.
Notochord, Dorsal hollow nerve cord, Pelvic girdle, Pharyngeal slits
Notochord, Pharyngeal Slits, Post-anal tail, Ventral nerve cord, endostyle
Pharyngeal slits, Dorsal fin, Notochord, Paired sensory organs, endostyle
Dorsal hollow nerve cord, Pharyngeal slits, Notochord, Post-anal tail, endostyle
All of the above
3. Lepidosaurs (a major group of the Eureptilia) contain the following organisms.
Lizards, Snakes, Amphisbaenids
Crocodiles, Dinosaurs, Birds
Crocodiles, Lizards, Snakes
Amphisbaenids, Dinosaurs, Birds
All of the Above
4. The Class Aves exhibits the following characteristics.
Jaws, Anapsid skull, Feathers, Endothermy
Jaws, Diapsid skull, Ectothermy, Feathers
Jaws, Diapsid skull, Feathers, Endothermy
Jaws, Feathers, Anapsid skull, Ectothermy
None of the above
2
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