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Q. How do birds reproduce?
Birds like every vertebrate have sexual reproduction. Their embryos develop within shelled eggs containing extraembryonic membranes and exterior the mother's body.
Birds copulate. Fecundation is interior and it occurs only before the female gamete is involved by the calcareous eggshell.
STRUCTURE Each chromosome composed of two interwoven (coiled) threads called Chromonema (Chromonemata) embeded in a matrix of semisolid protein. Surface of matrix is in
sanguivarous mode of feeding in annelida
A foreign DNA has to target a precise chromosomal site and integrate with the host DNA. Are the methods of gene therapy strong enough to produce desired expression without mistakes
Theor y of Epigenesis (i) It was proposed by C.F. Wolff & supported by Von Baer. (ii) Wolff proposed that germ cells contain definite but undifferentiated
Q. Can you explaon about Aortography? Visualization of the aorta and its branches is possible by several modalities today. Apart from angiography, aorta can also be visualized
Congenital Aortic Stenosis : The valve may be unicuspid, bicuspid or tricuspid. Rarely it is a dome shaped diaphragm. Uni commissural aortic stenosis produces significant sy
Injection Route An injection is an unpleasant experience for a person at any age and is particularly traumatic to the small child who often lives in fear to the next "need
To show that growing seeds take in oxygen Cork up one end of a tube, having first placed inside some damp cotton wool and some mustard seeds. Immerse the open end in dilute ca
What is Osseointegration Osseointegration was the hallmark of success in implant dentistry in the 1980s. It was believed that an implant was successfully integrated when there
Ethylene - Plant Growth Substances This hydrocarbon C 2 H 2 is a gas and is unbelievably a small and simple molecule to be accepted as a hormone. Ethylene is not produced by
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