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Metamerism in annelida in +3 student zoology paper

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·    Prof.- Dr ramakant pradhan  best of luck for your exam , you study and ask u doubt or other wise dout in other long question in biology ask me in comment box .ok  student by .  METAMERISM IN ANNELIDA   -     In some animals body is divided into a series of compoctment one behied the other. -    These componets are called segment. -        The inner arrengment of segment is called metamerism . CHARECTERSTICS OF METAMERISM -        In metamerism each segment is the mirror image of other segment. -       Each segment contain nepharidia , blood vessels ,reprodactive organ ,nerve and muscle. -       The segment mark in coporation with all orther segment. TYPES OF METAMERISM . A. True metamerism -        The segment of body is based on segmentation mesoderm. -       It is found is all anne...
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Respiration in mollusca , long qustion answer in simple word in +3 zoology students.

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↞RESPIRATION    IN    MOLLUSCA - Mollusce is a large phylum of invertebrate animal. - Mollusca are the largest marine phylum about 23% of all merine organism .               The respiration bring about the utilization of O 2 whitin the body                  and given out of CO 2 outside. - Respiretory organ in mullusca, these are, CTENIDIA - Ctenidia are the organs of aquatic respiratory and   it is present in aquatic mollusca. - The pulmonary chamber is the organ of aerial respiration and is present in terrestrial mollusca. - But in certain cases in pila , planorbis etc, both methords of respiration are used . - It is simplest methord in mollusca. - Ctenidia respiration through skin.   STRUCTURE   OF   CTENIDIA - The ctenidium has a cintrol axis one or two rows of f...
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Excretion in annelida long question for +3 zoology students

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EXCRETION    IN ANNILIDA - Excretion is defined as the separetion elimation of nitrogenus west from body to out side. - The organ involve in excretion called as ecretory organ. - In annelida exretion is brought about by these following organ. NEPHRIDIA - These are coild tubules arrenged segmentally drive from ectoderm and projected in the nephridia named as 1. proto-nephridia 2. meta-nrphridia A. PROTONEPHRIDIA - These are primitive type of nephridia open to exterior by an opening called nephridiapore. - Internaly it   blindly open towords coelom and are branched. - Each branch ends in a tubular cell ,   called solencytes. - It is a cavity surrounded by cytoplasm mass. - Flagellum arises from the mass of cytoplasm. - It is found in alcepa. B. METANEPHRIDIA - It has two opening ,one end is open to the coelom by funnel like structure called nephrostome. - And orther end open to anterior by nephridiapore,found in nereis. - Nep...
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