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PINEAL GLAND (EPIPHYSIS CEREBRI) -
Hormone - Melatonin concentration in the blood appears to flow a diurnal (day-night) cycle as it arises, in the evening and through the night and drops to a low around noon. Because of this light mediated response, the pineal gland may act as a kind of "biological clock" which may produce circadian rhythms (variations following a 24 hour cycle).
Girls blind from birth attain puberty earlier than normal, apparently because there is no inhibitory effect of melatonin on ovarian function.
locomotion in protozoans
Debate over ethics of using gene therapy for treating human beings started since the discovery of recombinant DNA technology. The mere fact that it involves the alteration of DNA w
How shigellosis diseases occur in humans Occurrence: Poor personal hygiene is a common factor in food borne shigellosis, with shellfish, fruits and vegetables, chicken and sal
Gaseous Exchange Gaseous exchange is take place on by both mantle and the gills. The gills of most bivalves are highly changed for filter feeding. They are derived from the pr
Explain herbicide tolerant crops Candidates who reached the scholarship standard demonstrated a wide general knowledge of the living world to which they could relate biologi
MEIOSIS Every organism is mortal, It becomes old and wornout with advancing age (= ageing ) and ultimately dies ,Before death however ,it reproduces its own kind, so
advantages and disadvantages of protozoa
What do you Understand by Amphid? Unique to the nematodes, these paired sensory structures are located on the sides of the head. An external pore leads to an inner chamber and
What is a stream? A stream is a incessant series of bytes that flow into or out of your program. Input and output from devices like the mouse, , disk, keyboard, screen, modem, a
Q. What is the difference between the concepts of genome and karyotype? Genome is the set of DNA molecules that characterizes each species or each living being. The concept the
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