Biology · Kingdom Animalia
Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.
Ascarisis characterized by which of the following?
- A
Presence of true coelom and metamerism
- B
Absence of true coelom and metamerism
- C
Presence of true coelom but the absence of metamerism
- D
Absence of true coelom but presence of metamerism, is also incorrect because Ascaris lacks metamerism as well.
Ascaris does not have a true coelom. Ascaris is an example of a pseudocoelomate organism. It possesses a pseudocoelom, which is a body cavity that is not entirely lined by mesoderm. This is in contrast to true coelomates, where the body cavity is completely lined by mesoderm.
Presence of true coelom and metamerism, is incorrect because Ascaris has neither a true coelom nor metameric segmentation.
Ascaris does not have a true coelom. Ascaris is an example of a pseudocoelomate organism. It possesses a pseudocoelom, which is a body cavity that is not entirely lined by mesoderm. This is in contrast to true coelomates, where the body cavity is completely lined by mesoderm.
Presence of true coelom but absence of metamerism, is incorrect because Ascaris does not have a true coelom.
It is incorrect because Ascaris does not possess metamerism at all. Metamerism refers to true body segmentation, which is completely absent in nematodes. Ascaris has a smooth, unsegmented body plan rather than repeated body units. Therefore, stating that it lacks a true coelom but has metamerism is wrong, because it does not show metamerism either.
Tagged under Biology · Kingdom Animalia