Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Secondary Egg Envelopes
These are secreted by oviducts and other accessory parts of genital organs while the egg is passing through them from ovary to the exterior.
a) In ovoviviparous sharks the egg is surrounded by a hard shell secreted by shell glands of the oviduct. The shell is drawn out as twisted horns which serve to entangle the egg among sea weeds.
b) In amphibians, the eggs are surrounded by a layer of jelly which protects the egg from adverse effects of sun rays, abrasion as well as from predators (because of its bad taste). The jelly absorbs water and swells.
c) In birds, reptiles and monotremes, the secondary envelopes include the white of egg surrounding the yolky ovum, followed by inner and outer shell membranes (which are in close contact with one another) and the outermost calcareous shell which is 'porous. The shell is elastic and compressible when the egg is laid but it hardens on exposure to atmosphere.
Q. What is the difference between the reptile heart and the amphibian heart? The reptiles have incomplete and double circulation three heart chambers two atria and one ventricl
What are the two divisions of the angiosperms? The angiosperms are separated into monocotyledonous and dicotyledonous. (These categories are defined later in this text.) Pla
Describe about Aorto Pulmonary Window ? This uncommon malformation consists of communication usually non-restrictive between the adjacent walls of the ascending aorta and pulmo
Define Control of infections for treatment for pem? Appropriate antibiotics should be started immediately since infections are the immediate cause of death in many children. Ch
Define Iron requirements of infants? The maintenance needs for all age groups is 14 mcg/kg body weights. For infants and preschoolers, iron needs for growth and' expansion of b
In the more highly developed animals, like humans this gas is used to regulate activity of the heart, blood vessels and respiratory system. WORKING MUSCLES PRODUCE A LARGE AMOUNT O
what exactly is oxidation and reduction potential and how its an imp. factor in spoiling meat
Q. How is the mesoderm (third germ layer) of triploblastic animals formed? The mesoderm shows from differentiation of endodermal cells that cover the dorsal region of the arche
Explain the functis of the main organelles in plant and animal cell as seen under the lightmicroscope
Starr-Edward (S-E) Silastic Ball Valve Prosthesis : This was introduced in 1961 by Albert Stm and has different models for mitral and aortic positions. It is a cage and b
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd