Is fecundation in amphibians internal or external, Biology

Assignment Help:

Q. Is fecundation in amphibians internal or external? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

In the majority of the amphibian species fecundation is external. This feature is common to bony fishes too and the embryonic development of amphibians are a heritage from osteichthyes and it shows that the reproductive system.

Curiously although having external fecundation amphibian female and male copulate to stimulate the liberation of egg cells and sperm. This phenomenon does not characterize internal fecundation since the gametes unite in water.


Related Discussions:- Is fecundation in amphibians internal or external

Extraembryonic membranes the same in all vertebrates, Are the extraembryoni...

Are the extraembryonic membranes the same in all vertebrates? The presence of each extraembryonic membrane varies according to the vertebrate class. In fishes and amphibians

What elements are present in carbohydrates, (a) Name four examples of compo...

(a) Name four examples of compounds which are classed as carbohydrate. (b) What elements are present in carbohydrates? (a) Sugars (glucose, fructose, maltose, sucro

What is risk factor interaction, What is risk factor interaction ? Coro...

What is risk factor interaction ? Coronary artery disease, as has been explained, is a multifactorial disease with diverse risk factors coming together and interacting to produ

Explain about the bioavailability of minerals, Explain about the Bioavailab...

Explain about the Bioavailability of Minerals? Polyphenols can form complexes with metal cations through their carboxylic or hydroxylic groups, and thus interfere with the inte

How can denaturation be classified, Q. How can denaturation be classified c...

Q. How can denaturation be classified concerning its reversibility? Protein denaturation can be an irreversible or a reversible process, i.e., it may be impossible or possible

Define the effect of breastfeeding on mother, Normal 0 false ...

Normal 0 false false false EN-IN X-NONE X-NONE

Describe excretory system of annelids, Q. How be able to the excretory syst...

Q. How be able to the excretory system of annelids be described? In each segment (metamere) of the being a pair of complete excretory structures known as metanephridium exists.

Indications of phototherapy, Indications i) When there is an abnormal...

Indications i) When there is an abnormal rise in the bilirubin level which may be due to physiological or pathological jaundice or any other problem. ii) Prophylactic ph

What is total amount of both reactants and products decrease, In Chemical R...

In Chemical Reactions that have a large negative /\Go' a- the total amount of both reactants and products decreases b- the products are less stable than the reactants c- t

Ascitic fluid collection - specimen collection, Pleural, Pericardial, and A...

Pleural, Pericardial, and Ascitic fluid Collection:      The procedure is called paracentesis . If for pleural cavity is called thoracocentesis , and for pericardial cavity c

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd