External factor - factor controlling metamorphosis in insect, Biology

External factors - Factors Controlling Metamorphosis in Insects

In few cases an external factor may be accountable for initiating moulting, as for instance in the blood sucking Rhodnius the intake of food (blood meal) is such type of a factor. Another example where external factor is essential to initiate a moult is the case of the pupa moth Platy samia cecropia. After pupation the insect falls into a quiescent state along with a reduced rate of metabolism - diapause - that continues throughout winter. It is essential that during this time the pupa be exposed to cold, or else the diapause is prolonged indefinitely. The diapause might be broken precociously if the pupa is exposed to cold (3° to 5° C) for at least two weeks.

The temporary cooling activates the very important processes in the pupa and on return to a warmer environment development is completed, the pupa moults and the imago emerges. In other insects factors like humidity, population density etc., appear to start metamorphosis. Though in the majority of insects no external cause of any moult has been detected and moults follow one other at intervals that appear to be ascertained entirely by the internal processes in the animal.

Posted Date: 1/31/2013 12:00:13 AM | Location : United States







Related Discussions:- External factor - factor controlling metamorphosis in insect, Assignment Help, Ask Question on External factor - factor controlling metamorphosis in insect, Get Answer, Expert's Help, External factor - factor controlling metamorphosis in insect Discussions

Write discussion on External factor - factor controlling metamorphosis in insect
Your posts are moderated
Related Questions
Which of the recombination process(transformation, conjugation and transduction) would be most likely to occur in the natural environment?

The physician orders 2 liters of lactated ringers over 16 hours. The drip factor of the tubing is 20 gtt/cc. What will be the flow rate? a. 33.33 or 34 gtt/min b. 41.66 or 42

What is phosphorylation? What are some biological processes in which phosphorylation plays a critical role? Phosphorylation is the name given to processes of the addition of ph

What are muscle tissues? How is the function of this tissue related to the typical characteristics of its cells? Muscle tissues are tissues made of cells able to perform contr

Minerals and Rocks      A mineral is an inorganic body, formed by the process of nature, usually having a definite composition. If formed under favourable conditions, it has a



These labs discuss the principle of osmolarity, which is defined as the total number of solute particles in 1 L of solution. Is this the same thing as tonicity? Explain your answer

Explain the Secondary structure of proteins The secondary structure of a protein involves the way that the chain of amino acid either twists or folds back upon itself to form a

Determine the Benedict's Test Glucose in urine is detected by Benedict's method and the test is known as Benedict's test. This test is used to detect glucose in urine (Glycosur