Answer: Males and females differ in form.
- A It can change its sex
- B It reproduces only asexually
- C Males and females differ in form
- D Each worm is a hermaphrodite
Correct answer: C. Males and females differ in form
Explanation: In Ascaris the sexes are separate and look different - males are smaller with a curved posterior end - i.e. sexual dimorphism.
Moving across the animal phyla, body organisation becomes progressively more complex: from no symmetry and cellular organisation (Porifera) through radial/diploblastic (Cnidaria), bilateral/acoelomate (Platyhelminthes), pseudocoelomate (Nematoda), to a true coelom with full organ systems (Annelida and beyond).
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.