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.
How are the symmetry and the nervous system characterized in echinoderms? Adult echinoderms, with cnidarians, are the animals that present radial symmetry, i.e., their body str
Ask question #Minimum 100 words adccepted#
What is the difference among smooth and rough endoplasmic reticulum? Ans) The endoplasmic reticulum is a fine membranous structure contiguous to the nuclear membrane and p
I need the parts of the structure carbon. Include elements,monomer,polymer, and any sub units
State about the importance of Potassium Potassium is the third major element required for plant growth, generally absorbed as K + ion. In soil 95 to 99 percent of potassium e
What organisms make starch? What is it used for? What organisms make glycogen? What is it used for?
Transcription continues until a termination series is reached. The most common termination signal is a GC-rich region which is a palindrome, followed by an AT-rich sequen
Q. How do birds reproduce? Birds like every vertebrate have sexual reproduction. Their embryos develop within shelled eggs containing extraembryonic membranes and exterior the
Excretion in Protozoans Excretion of metabolic wastes is dope almost exclusively by diffusion. All protozoans are ammonotelic i.e., the end product of their nitrogen metabolis
filter feeding mode of nutrition is observed in- a) amoeba b) euglena c)paramoecium d) all of the above
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