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Why, even though they have an open circulatory system, can flying insects like flies beat their wings with great speed?
In insects the circulatory system is open but this system does not participate in the gas exchange process and in oxygen supply to the tissues. Gases go in and out by the independent tracheal system that permits direct contact of cells with the ambient air. Thus an insect can supply the great oxygen demand of its fast-beating wing muscles even having open circulatory system.
How different are gymnosperms from bryophytes and pteridophytes? Gymnosperms are not cryptogamic as bryophytes and pteridophytes are. They are phanerogamic and so they form flo
What is Phylum Platyhelminthes - Flatworms ? This Class consists of the free-living flatworms, the best known of which is the Genus Planaria. Most of the species in this class
How is the depolarization of the neuronal plasma membrane generated? How does the cell return to its original rest? When the neuron receives a stimulus by the binding of neurot
Adsorption - Colloidal particle Colloidal particles attract and hold to their surfaces the molecules of various gases, vapors and other matter with which they come into contact
Q. What are the colors (of the electromagnetic spectrum) absorbed by plants? What would happen to photosynthesis if the green light waves that reach a vegetable were blocked? C
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Biological diversity is the new buzzword, the magic door to international funding and global travelling. We share the earth with million of other living beings. Just as we humans m
Results of Mitral Valve Replacement: The risk of mitral valve replacement is reported as 3-5 per cent. It also depends on multiple factors like age, functional clas
Trypanosomiasis The trypanosomiasis, also known as African sleeping sickness or Chaga’s disease, is caused by Trypanosoma cruzi, T. gambiense and T. rhodesience. T. evansi cau
Infective Endocarditis : All patients with prosthetic valve come under the high-risk category for endocarditis. They need prophylactic antibiotics if any procedure, which is like
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