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

Explain use of rifaximin, Rifaximin (Xifaxan)  An anon-absorbed oral an...

Rifaximin (Xifaxan)  An anon-absorbed oral antibiotic, was about as effective as ciprofloxacin for treatment of travelers' diarrhea, mostly caused by E. coli. It is not effecti

Explain dextrorotatory, Dextrorotatory:- When  an  optically .active su...

Dextrorotatory:- When  an  optically .active substance rotates  the plane of polarized light in a clockwise direction.

Vitamins - digestion process, Vitamins differ from minerals in that vitamin...

Vitamins differ from minerals in that vitamins are compounds, and not elements. Vitamins do not help form bodily structures and thus are needed strictly in small quantities-sometim

Simplification and selection of information of consciousness, Q. Simplifica...

Q. Simplification and Selection of information of Consciousness? Simplification and Selection of information: There is much "editing" that goes on in the mind-from the first cu

Explain the hormonal control of blood sugar levels, The sugar carried in th...

The sugar carried in the blood is glucose; the normal value of sugar in the human bloodstream is approximately 90mg per 100 bloods. Sugar is absorbed from the small intestines and

What are plant hormones, What are plant hormones? Plant hormones, also ...

What are plant hormones? Plant hormones, also known as phytohormones, are substances that control the embryonic development and the growth of the adult plant.

Explain seed gums, Seed gums Polysaccharides derived from plants and se...

Seed gums Polysaccharides derived from plants and seeds have been in use for thousand of years. Seed gums are a group of polysaccharides with the following properties: S

Environmental acts and regulations, The environmental pollution has become ...

The environmental pollution has become a biggest threat  to humanity. To over-come this problem a suitable preventive legislation is need of hour. The problems of acid rain ,ozone

Describe wide split s in details, Describe Wide Split S in details? It ...

Describe Wide Split S in details? It is a persistent split that widens on inspiration to at least 60 msec. May be due to delay in P, e.g. RBBB or due to early A, as occasionall

Explain the bacillus - characteristics of bacteria, Explain the Bacillus - ...

Explain the Bacillus - Characteristics of Bacteria? Bacillus - It is gram positive, endospore former, obligate aerobic or facultative aerobic rods belonging to order Bacilliale

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