Imaginal discs, Biology

Imaginal Discs

In the holometabolous larva, there are two cell populations:

(1) The larval cells that are used for the larval structures and

(2) The imaginal disc and the histoblasts that are present in clusters, awaiting the signal to differentiate.

Imaginal discs do not take place in the nymphs and larvae of hemimetabolous insects. The imaginal discs or buds are actually rudiments of future organs of the adult, like mouth parts, wings, antennae, walking legs, and internal organs etc. Figure displays the imaginal discs in the larva and pupa of a fly (Musca). These discs develop directly from the eggs and remain nonfunctional during the larval stages. During the pupal stage they grow in size and differentiate to form adult structures which remain collapsed and folded. While the reorganization is completed the pupa moults to set free the adult or imago. Once the adult or imago blood is pumped into this collapsed structure it causes them to unfold and inflate. Furthermore chitin is deposited on then to harden them.

 

2091_Imaginal Discs.png

Figure: Imaginal Discs

Posted Date: 1/30/2013 7:09:49 AM | Location : United States







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

Write discussion on Imaginal discs
Your posts are moderated
Related Questions
E n z y m e - linked immunosorbent assay (ELISA):   ELISA in its var io us modifications e.g. plate ELISA, sandwich ELISA, competitive ELISA, ELISA strip or

A mother has brought her 2-week-old infant to the emergency department due to the baby's persistent and increasing jaundice. Blood testing reveals that the infant's unconjugated bi

Gene or point mutations occur when the DNA sequence of a gene is altered and the new nucleotide sequence is passed on to the offspring. This occurs either due to addition or deleti

What is Cerebrum Cerebrum is divided into right and left parts known as cerebral hemisphere. It is the largest part of the brain. The functions of the cerebrum:  It recei

Classification of proteins based on chemical properties? Depending on their chemical properties and optical activity, the amino acids in proteins are classified under the follo

what is the differnce between syndrome and symptom?

Define Sugars - Chemistry and Functionality? In this section we will learn about the simple carbohydrates called sugars. As you may already know, those carbohydrates that canno

Endosperm with Chalazal Haustorium In Grevillea robusta, a member of Proteaceae the endosperm is of the free nuclear type. The upper part of endosperm becomes cellular, where

Explain the NATURAL HISTORY OF CORONARY ARTERY DISEASES (GAD)? The natural history of CAD is very important from the preventive point or view. Though the usual manifestations o

Define Procedure for Testing the Presence of Proteins in Milk? 1. Add 0.5 ml of alcohol to 0.5 ml milk.  Alcohol helps in curdling the milk. 2. Observe for the curdling of m