Question

Syncytial epidermis occurs in
(a)Ascaris
(b)Hydra
(c)Taenia
(d)Leucosolenia

Answer 1

Hint: This is a parasitic nematode worm responsible for infection in the digestive system also known as ‘small intestine roundworm’. The most common in causing helminth infection of humans worldwide.

Complete answer:
Ascaris is a long, cylindrical worm whose body wall is composed of the cuticle, epidermis in syncytial nature. The syncytium is a condition when a cell contains a large number of the nucleus which is the result of multiple cell fusion of multiple nuclear divisions without cell division or cytokinesis. This syncytial epidermis is present below the cuticle which is present on the cell wall of Ascaris.

Additional Information
-In Ascaris embryology, there is no cellularization. Thus syncytial specification is a hybrid condition of the autonomous and conditional that occurs in Ascaris.
-Ascaris is a parasitic worm in humans which causes disease ascariasis in humans.
-They infect humans via the faecal-oral route, their egg hatches then penetrates the wall of the gastrointestinal tract of humans and enters the bloodstream.
-The maturation site of Ascaris in the small intestine of humans.
-Most of the insects like drosophila have characteristics of early nuclei shared in the cytoplasm.
-The morphogens typically functioning in the syncytial specification are transcription factors.

So, the correct answer is, ‘Ascaris.’

Note:
-In humans, the cardiac muscle is a syncytium of many heart muscle cells in which the cardiac cells are so interconnected that when one of these cells becomes excited, the action potential spreads to all of them.
-The human heart is composed of two syncytia:
The atrial syncytium, where the walls of the two atria.
The ventricular syncytium, which constitutes the wall of the two ventricles.