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

Do fats with one or more ''kinky'' tail fatty acids, Do fats with one or mo...

Do fats with one or more 'kinky' tail fatty acids tend to be solid or liquid at room temperature? These are found in triglycerides forming what? Solid fats or oils? Is it opposite

Explain the parts of the microscope, Explain the Parts of the Microscope? ...

Explain the Parts of the Microscope? Microscope, as you may have noticed in Figure or for that matter even seen in a laboratory, is a metal body composed of a base and an arm t

Describe about the term - neuropsychological assessment, Describe about the...

Describe about the term - Neuropsychological assessment Neuropsychological assessment has its roots in neurology, the branch of medicine that focuses on the nervous system and

Define role of zinc in controlling gene expression, Define role of Zinc in ...

Define role of Zinc in controlling Gene Expression? Zinc atoms have specific structural roles in enzyme molecules, as well as, in many other proteins and in bio membranes. Thes

Growth rate in animals, GROWTH RATE IN ANIMALS - Growth rate is differe...

GROWTH RATE IN ANIMALS - Growth rate is different at different periods of life. Growth period in human may be studied in 5 steps - (i) Prenatal - In gestation period fo

What is oral hygiene, What is Oral Hygiene  An index can be used to eva...

What is Oral Hygiene  An index can be used to evaluate the oral hygiene level in the patient e.g. Oral hygiene Index (Green and vermilion) or Plaque index (Silness and Loe). An

Abiotic factors of an ecosystem, Q. How does biological diversity relate to...

Q. How does biological diversity relate to the characteristics of the abiotic factors of an ecosystem? The ease of use of abiotic factors like light, mineral salts, moisture, h

Explain about steatorrhoea, Q. Explain about Steatorrhoea? Steatorrhoea...

Q. Explain about Steatorrhoea? Steatorrhoea is a symptom of the disorders of fat metabolism and malabsorption syndrome and can be defined as n condition of foul-smelling bulky

Determine the uni-ocular movements, Determine the Uni-ocular movements ...

Determine the Uni-ocular movements Uni-ocular movements are the movements of  one eye  studied  at  a time. That means, when left  eye is  covered, then movements  of  uncovere

Reed-swamp stage - hydrarch, Reed-Swamp Stage - Hydrarch This stage is...

Reed-Swamp Stage - Hydrarch This stage is also known as amphibious stage, as the plants of the community are rooted but most parts of their shoots remain exposed to air. Speci

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