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Ventilation of Tracheal System - Diffusion
Gaseous exchange due to diffusion generally takes care of the oxygen needs of most small insects. Similarly fairly large but inactive insects (e.g., some large caterpillars) do not actively ventilate the system. Diffusion alone is adequate provided the spiracles are kept open permanently. The same process accounts for elimination of carbon dioxide.
West Nile virus infection West Nile virus (WNV) is a type strain of flaviviruses and is related to Japanese encephalitis group. The virus was first isolated from a woman in the
Entry of Pollen Tube into the Embryo Sac The pollen tube enters the embryo sac through the filiform apparatus of ong of the synergids. Generally, one of the synergids degenera
a precaution to follow when heat fixing a smear
Q Are viruses cellular beings? Viruses are considered living beings but they don't have cellular structure. There are few controversies regarding their classification as liv
A n a e m i a It is defined as decrease in the amount of haemoglobin (Hb) per unit of blood. This may or may not be accompanied by a reduction in the red blood cells (RBC
How does biological diversity relate to the characteristics of the abiotic factors of an ecosystem? The availability of abiotic factors as light, moisture, mineral salts, heat
Each of the following are true of antimicrobial therapeutic drugs except A. Non-toxic to host B. Easily broken down by host C. Easily administered D. Limited capacity to elicit
what are sphaerosomes?
Transcription continues until a termination series is reached. The most common termination signal is a GC-rich region which is a palindrome, followed by an AT-rich sequen
Q. What are the respective ploidies of zygote, gamete and somatic cells in a species with gametic meiosis? Adopting as pattern an "x" quantity of chromosomes for gametes, somat
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