Complete metamorphosis, Biology

Assignment Help:

Complete Metamorphosis

In all Endopterygota insects, where wings and other structures develop internally, (in invaginate imaginal epidermal pockets) such as beetles, wasps, bees, butterflies, moths etc., the larva which hatches out of egg is extremely different from the imago, in habit, appearance and structure. The larva has a worm-like body, biting and chewing mouth parts, simple eyes and weakly developed walking legs. It has quite a dissimilar habit. For instance the mosquito larva lives in water and feeds on protozoa and algae, while the adult either sucks blood or fruit and flower juices. A more general example s the butterfly larva which crawls on the ground and feed on leaves and then gets changed into an aerial organism feeding on nectar from flowers.

The larvae of these types of insects are either swimmers or crawlers, and are voracious eaters. They grow in size and moult various times till they attain a quiescent, non- feeding stage called pupa. The pupa is enclosed in a pupal case or the puparium secreted through the labial glands of the larva. This pupa does not move or feed and its energy have to come from the nutrients it ingested while a larva. Externally it appears as an inactive structure. Though internally it undergoes basically two types of changes at a rapid pace and moults just only after the complex series of internal changes have taken place. These changes include wholesale destruction of most of the larval tissues (histolysis) and the formation of a completely new adult body whose organs and systems are developed (histogenesis) from nests of organ specific cells, called the imaginal discs. Histolysis results in systematic destruction of the old body of the larva that is why all the organs except for the central nervous system are broken down by unique amoebocytic cells called phagocytes. The tissue fluid, which arises due to the destruction is used as raw material in the creation and histogenesis of the adult organs. After these changes are completed as a result of histolysis and histogenesis the pupa goes through the pupal moult and the imago (adult) emerges fully ready to lead a short or long independent existence and to reproduce.

 


Related Discussions:- Complete metamorphosis

What is protocooperation, Q. What is protocooperation? The Protocoopera...

Q. What is protocooperation? The Protocooperation is the ecological interaction in which both participants benefit but which is not obligatory for their survival. The Protocoop

Pulmonary function tests - diagnostic tests, Pulmonary  Function Test: ...

Pulmonary  Function Test: Pulmonary functions  tests (PFTs) provide information about a clients manifestation by measuring lung volumes, lung mechanics, and diffusion capabili

Impact of technological change on the cost of health service, Impact of Tec...

Impact of Technological Change on the Cost of Health Service Technological developments entail improvement in production/service frontiers either by providing cost benefit adv

Explain measurement of cell mass - microbial estimation, Explain Measuremen...

Explain Measurement of Cell Mass - Microbial Estimation? You may recall reading earlier that filamentous bacteria and moulds cannot be counted satisfactorily by employing plate

Respiratory gases -respiration, Respiratory Gases -Respiration Physio...

Respiratory Gases -Respiration Physiologically the most important gases are oxygen, carbon dioxide and nitrogen. Molecular oxygen comprises 21% of the atmosphere; carbon diox

.photosynthesis, what additional substance does a plant need to male amino ...

what additional substance does a plant need to male amino acids and proteins from glucose

Disease, what is the differnce between syndrome and symptom?

what is the differnce between syndrome and symptom?

Explain insect resistant crops - evolutionary, Insect resistant crops (IRC)...

Insect resistant crops (IRC) Insects are a natural selection pressure so plants resistant to certain insects could have an evolutionary advantage (in natural environments)

How implant design and surface affect osseointegration, Q. How Implant desi...

Q. How Implant design and surface affect osseointegration? Implant design Most conductive design for osseointegration is root form. They can be threaded, hydroxyapatite co

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