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Posted Date: 06 Jul 2008 Posted By: richa Member Level: Silver
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2008 Banaras Hindu University Zoology b.sc (hons)part 3 examination 2008 Question paper
zoology
mammalian endocrinology and developmental biology
full marks 75 hours 3
coloured diagram s are permitted
section___________A
( mammalian endocrinology)
( marks 37 1/2)
answer three question including question 1 is compulsory
1.)
(A)mention weather the following statements are true or false, giving in brief in support of your answer[ marks 3*2]
(1)glucagon is the hypoglycemic agent.
(2) adrenal cortex is steroidogenic
.
(3) chief cells are source of parathormone.
(B)match the terms in column a with those in column b [marks3*1/2]
column a column b
(1) LH (a) acidophils
(2) Addison's disease (b) hypothalamus
(3)CRH (c) pars distalis
(d) adrenal cortex
2.describe biosynthesis ,biological actions and control of secretion of hormones of adrenal cortex
3.describe in brief: [ marks 7 1/2]
(a) biosynthesis of biosynthesis
(b) mechanism of steroid hormone action
4.give a flow diagram showing biosynthesis of ovarian steroids. describe their biological actions[marks 15]
5.write short notes on the following [ marks 5*3]
(a)G proteins
(b)calcitonin
(c)pheromones
section ___________B
( developmental biology)
( marks 37 1/2)
answer three question including question 1 is compulsory
1.(A)mention weather the following statements are true or false, giving in brief in support of your answer [ marks 3*2]
(a)gastrulation in frog embryo is initiated at the future ventral side of the embryo
(b)cleavage of sea urchin eggs is radial holoblastic type.
(c)zona pellucida in mammals plays a role analogus to that of the vitelline envelope
(B)____ select the correct correct option from the following and justify your choice[marks 1 1/2]
at the cellular blastoderm stage od Drosophila stage each cell is
(a)determined in its fate
(b) differentiated
(c) totipotent
(d)pleuripotent
2.(a) describe the types of cellmovements through the primitive streaks during the gastrulationin chick which become the major body parts [marks 8]
(b)what are the extra embryonic membranes that support and nourish the mammalian embryo? [marks 7]
explain biological role of each one of them
3.(a)describe the hierarchy of the gene that determine antero-posterior polarity of embryo of embryo in drosophila.....................................................................................................[marks10]
(b)identify different steps in which oogenesis and spermatogenesis differ.[ marks 5]
4.___.write short notes on the following [ marks 5*3]
(a) spemann's organizer
(b) cortical reaction
(c) fate map and cell lineage studies
5.(a) explain with the help of suitable diagrams, the process of development of vertebrate eye. which gene is believed to a play key role in the process.[ marks 10]
(b) describe the formation and significance of gray crescent.[ marks 5]
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