Metamorphosis, Biology

Metamorphosis

The phenomenon of metamorphosis is described as a process during development which involves a remarkable change in morphology and physiology of the larva, so that it is transformed into an adult with totally different morphology and physiology, often for life in a different habitat. In many such type of animals undergoing metamorphosis, the larva is usually very different from the adult. The best known instances are tadpoles of frogs, caterpillar of butterflies and moths, tadpole larva of ascidians, several larval types of crustaceans, ciliated trochophores of marine annelids and molluscs etc; actually sow times the difference between the larva and adult is so great that with no knowing the origin of the egg, or without following the young one by its full development, it would be next to impossible to know that the young and the adult are of similar species.

In the past such differences have sometimes led to the larva and adult of similar species being assigned to different taxonomic groups. For instance the larva and adult of the axolotl Ambystoma (Urodele - amphibia) and Tribegulians of blister beetle (Inasecta) till quite freshly were mistakenly assigned to different species. Much More than a century ago, only the study of metamorphosis of the tadpole larva of ascidians could decide that the ascidians belong to Phylum Chordata. The changes that take place due to metamorphosis relate often to a change in habitat with a corresponding alter in the organisms structure and other features. For example, in sea urchins, there take place a change from planktonic to benthic existence, in frogs and toads from an aquatic to a terrestrial mode of life and in insects from a non-flying to a flying life.

 

Posted Date: 1/30/2013 5:41:43 AM | Location : United States







Related Discussions:- Metamorphosis, Assignment Help, Ask Question on Metamorphosis, Get Answer, Expert's Help, Metamorphosis Discussions

Write discussion on Metamorphosis
Your posts are moderated
Related Questions

write down the division of cryptogamae and phanerogamae

Q. What is the structure of the adult fern within which cells undergoing meiosis can be found? In these plants meiosis takes place within structures known as sorus (plural, sor

Explain about the IMViC Test? IMViC test is a combination of four tests: (1) Indole production (2) Methyl Red test (3) Voges Proskauer, and (4) Citrate Utilization

Describe the structure of the pancreas. How is the pancreas modified to carry out its various functions? How does the human pancreas compare to that of the fetal pig?

Explain the Urinary Excretion Test - riboflavin status? Urinary excretion of riboflavin is determined at different levels of intake. Under conditions of adequate riboflavin int

Q. Do the -H groups bound to the central carbons participate in the peptide bond? The central carbons themselves, the -R groups and the hydrogen attached to the central carbons

What are vitamins? What are the main vitamins needed by humans? Most vitamins are coenzymes (fundamental substances for the enzyme functioning) that are not formed by the organ

Explain Doctrine of Signatures? Handed down from the ancients, and elaborated on by the herbalists, was the 'Doctrine of Signatures', which was based on features that resembled

What is population growth rate? Population growth rate (PGR) is the percent variation among the number of individuals in a population at two different times. Thus the populatio