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Question
Besides paired series of nephridia, there is a single large nephridium known as ................ in protochordates.
Besides paired series of nephridia, there is a single large nephridium known as ................ in protochordates.
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Solution
The correct option is D Hatschek's nephridia
In addition to the paired nephridia, a single large Hatschek's nephridium occurs above the roof of the pharynx lateral to the left dorsal aortae. It resembled the paired nephridia in structure. It is a narrow tube. Its anterior end terminates blindly in front of Hatschek's pit while the posterior end opens into the prebronchial region of the pharynx just behind the velum.
So, the correct answer is option B.
In addition to the paired nephridia, a single large Hatschek's nephridium occurs above the roof of the pharynx lateral to the left dorsal aortae. It resembled the paired nephridia in structure. It is a narrow tube. Its anterior end terminates blindly in front of Hatschek's pit while the posterior end opens into the prebronchial region of the pharynx just behind the velum.
So, the correct answer is option B.
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