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.
What are some functions of the cartilages in the human body? Cartilages are responsible for the structural support of the nose and ears. The trachea and the bronchi are also or
Research to Improve Health Care Delivery: Today, much of health care delivery system remains imitative and intuitive rather than innovative, creative or scientific in
Before stem cuttings are planted, the cut end of the stem is often dipped in a hormone powder. What is the point of this? The hormone powder having a plant growth substanc
What are the major divisions and representing species of the gymnosperms? This group of plants can be separated into conifers (pine, sequoia, cypress), that have flowers called
Q. Why is the fish circulation classified as a complete and simple circulation? Simple circulation is that in which the blood circulates only in one circuit as opposed to the d
What are enzyme cofactors? Some enzymes require other associated molecules to work. These molecules are known as enzyme cofactors and they can be, for example, organic ions lik
Define the Indicators of Nutrition? We will begin our study on this topic by first understanding what we mean by an indicator. An indicator is a "specific and measurable statis
Is there vaccine against tuberculosis? The vaccine against tuberculosis is known as BCG (bacillus Calmette-Guérin). BCG is not used in some countries where tuberculosis is not
Q. What are the human tissues affected by malaria? What are the main clinical manifestations of the disease? A plasmodium contaminates the human blood causing destruction of RB
Define Polyacrylamide gel electrophoresis (PAGE)? Acrylamide gel has the advantage over starch in that it is easier to prepare and is more inert, the pore size can be varied in
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd