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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.
Nuclear endosperm in angiosperm.
What is the energy efficiency of photosynthesis? a) What area is occupied by each molecule? b) Calculate the molecular absorption cross section in units of A 2 A cr
Ethylene glycol is a poison that causes about fifty deaths a year in the United States. Treating people who have drunk ethylene glycol with massive doses of ethanol can save their
Heartwood differs from sapwood in: 1. Presence of rays and fibres 2. Absence of vessels and parenchyma 3. Having dead and non-conducting elements 4. Being susceptible t
Define Food quality factors and their measurement? Appearance; textural, flavour, nutritional, sanitary and keeping factors; quality standards, objective and organoleptic evalu
Q. What is the relation between the hypophysis and the thyroid? The hypophysis secretes TSH (thyroid- stimulating hormone). This hormone hastens the secretion of thyroid hormon
What is retrograde peri-implantitis? Retrograde peri-implantitis has been described by Misch as implant failure probably due to bone microfractures caused by premature implant
Oxides of nitrogen: These include nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO is a colourless, odourless and inert gas but like CO it can also combine with
Q. Into which periods is mitosis has divided? Mitosis is divided into four periods: metaphase, prophase, telophase and anaphase. Q. What are the centrioles and in which typ
SKULL- Present in head region. It is supported on the top of vertebral column. It is made up of the hardest and denest bones in the human body. It consists of cranium
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