Types of metamorphic changes, Biology

Types of Metamorphic Changes

The process of metamorphosis includes reactivation of the morphogenetic processes. The morphogenetic changes also the mode of causation of these changes vary in different animal groups. The degrees of changes that take place during metamorphosis depend on the degree of difference between the larva and the adult forms. For instance, in urodele amphibians (newts) and hemimetabolous insects (cockroach), larva and adult show some differences. The metamorphic changes are comparatively less and metamorphosis is said to be gradual or incomplete. Conversely, in anuran amphibians (frogs) and holometabolous insects, where differences among the larva and adult are enormous, the changes during metamorphosis are extensive and drastic.

This kind of metamorphosis is called radical or complete metamorphosis. The changes throughout metamorphosis include those of structural, physiological and biochemical nature. These are marked through disintegration and atrophy of some structures, cellular death in some tissues, morphogenesis and differentiation of certain new structures and remodeling of some another. These alterations of metamorphosis in at least some groups of animals (insects, crustaceans, amphibians) are known to be controlled by hormones that serve as the causative agents of metamorphosis.

Posted Date: 1/30/2013 5:49:22 AM | Location : United States







Related Discussions:- Types of metamorphic changes, Assignment Help, Ask Question on Types of metamorphic changes, Get Answer, Expert's Help, Types of metamorphic changes Discussions

Write discussion on Types of metamorphic changes
Your posts are moderated
Related Questions
A monohybrid cross: A.Determines the genetic makeup of an organism B.always involves homozygous alleles. C.always involves organisms that are heterozygous at all loci. D.Always inv

What are epithelial tissues? What are their general function and how is that function associated to the features of the tissue? Epithelial tissues, also known as epithelia, are

A 70-year old woman presents with a 1-hour history of crushing substernal chest pain. Shortly after admission, the patient expires. An autopsy reveals calcium deposits in the intim

Honeybees are unusual in that male bees (drones) have only one copy of each gene, while female bees have two copies of their genes. That is because drones develop from eggs that ha

Unfortunately, unlike heart failure due to systolic dysfunction, diastolic heart failure has been studied in few clinical trials, so there is little evidence to guide the care of p

C o c c i d i o si s It is a protozoan disease, caused by Eimeria species, resulting in enteritis, debility and anaemia. E t iology: It is caused by E.

Q. Marking regulations of honey? The marking regulations indicate that each container of honey shall be suitably marked so as to give suitable information as follows: a) N

Q. Explain about Gastric ulcers? Gastric ulcers occur in the lesser curvature of the antrum of stomach. A gastric ulcer appears to be caused by reflux of bile and factors that

how adoctor dicide a sickness of a patiant

What are the Micronutrients   All the micronutrients except molybdenum, boron and chlorine are available more in acid soils. These elements may limit plant growth either becaus