A) Both A and R true and R is the correct explanation of A.
B) Both A and R true, but R is not the correct explanation of A.
C) A is true, R is false.
D) Both A and R are false.
Correct Answer: A
Solution :In Ascaris, locomotion is poor because their body wall lack circular muscles. Ascaris (round worms) consitute the phylum-Aschelminthes. They may be free-living, aquatic and terrestrial or parasitic in plants and animals. In Ascaris, the epidermis is either a syncytium or a single layer of cells and is covered by a thick collagenous cuticle. The cuticle is often of complex structure and may have two or three distinct layers. Underneath the epidermis lies a layer of longitudinal muscle cells. The relatively rigid cuticle works with the muscles to create a hydroskeleton as they lack circumferential muscles.
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