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 morphological feature of molluscs after which the phylum is named? The word "mollusc" imply "soft thing". Molluscs have soft bodies and this feature describes the
What does an osteoblast cell do? Living cells within the bone are occupied in an unceasing process of remodeling. Osteoblasts lining the surface of bone are much like fibroblas
10 mcq question in the topic of plants of 9th standard
SEMINAL VESICLES (UTERUS MESCULANIS) - Seminal vesicles are elongated, convoluted, musculo glandular sac about 4 cm long ( 9 cm if straightened). Lined by pseudostratified e
explain hadzi''s theory with reference to metazoa
Reaction - Processes in Succession This is the most important stage in succession. The mechanism of modification of environment, through the influence of living organisms on i
Q. What are the three major types of RNA? What is meant by heterogeneous RNA? Messenger RNA, or mRNA, transfer RNA, or tRNA, and ribosomal RNA, or rRNA, are the three main type
What are the major morphological differences between monocot plants and dicot plants? The main differentiation criteria among monocots and dicots are: number of cotyledons (see
What is human eye Accommodation The human eye focuses at objects at infinity, without exerting any power. This means that when a person is observing an object at infinity, the
Determine Guidelines to Lower Risk and Wise Use of Drugs? There can be no two views regarding the act that the management of many diseases require drug therapy. However, they m
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