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What do you understand by Metanephridia?
An excretory-osmoregulatory organ comprising a ciliated funnel, nephrostome, connected to tubules that lead to the external nephridiopore. Nephrostome collects coelomic fluid, and all of its contents, to produce urine.
Q. From the lumen to the external surface what are the tissues that form the digestive tube wall? From the internal surface to the external surface, the digestive tube wall is
PO L YTEN E CHROMOSOMES First seen by Balbiani in salivary glands of larva of Chironomus insect (belongs to order Diptera). Later on such chromosomes observed in severa
What is the most abundant form under which nitrogen is found in nature? The most abundant nitrogen-containing molecule found in nature is molecular nitrogen (N2). The air is 80
Signs and Symptoms Decreased urine output Bloody or brown colour urine Edema Malaise Mild headache Gastrointestinal disturbances
What is recombination frequency? Recombination frequency, or crossing over rate, is the percentage of recombinant gametes made by crossing over (in relation to the number of pa
Q. Tools used in Taxonomy? Before you plan for a field trip decide the tools and equipment required. Certain, equipments are necessary for plant collection. A collecting pick i
What do you mean by sex ratio? Sex Ratio is defined as "the number of females per 1000 males". Sex ratio is an important social indicator to measure the extent of prevailing e
A tumbler garden Grow several kinds of seeds in 'tumbler gardens'. Every pupil might grow a tumbler garden of his own and keep a day by day pictorial record of the progress of
What are the biological troubles that molluscs face due to their soft body? Because molluscs have a soft body they are more fragile. They also have more complexity to support t
Social Basis of Primitive Life: In the previous section, we gave you a glimpse of how the primitive human beings faced the problems of day to day existence and found some so
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