Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Define osseointegration and its theories. Osseointegration implies that "it is a contact established without interposition of non bony tissue between normal remodeled bone and
What is connective tissue proper? The name connective tissue proper is used to assign the connective tissue that fills interstitial spaces as opposed to the specialized connect
Dosage and administration Menactra is given as a single intramuscular injection. The need for and timing of booster doses is unknown. An unpublished study summarized in the p
Stratification of Vegetation - Qualitative Characters Stratification of vegetation is another important feature of plant communities. There are different vertical strata in di
Q. Silent Myocardial Ischaemia? Ans. This deals primarily with those who have never had symptoms recognized as being of cardiac origin. Others, who have had recognized myo
Q. What are the classes of lipoproteins in the blood? Blood lipids (cholesterol, triglycerides and phospholipids) being insoluble in blood need a ship to travel in our body; it
Define the Indicators of Nutrition? We will begin our study on this topic by first understanding what we mean by an indicator. An indicator is a "specific and measurable statis
Q. What are the main types of waste? The waste can be classified into many kinds, each of them carrying its own different environmental problem: recyclable waste, organic waste
What are the grasslands of North America and of South America respectively called? The steppe grasslands of North America are known as prairies. The grasslands of South America
Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd