Question
Sexual dimorphism is seen in:
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CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Nemathelminthes
Sexual Dimorphism Identification in Animal Phyla
Sexual dimorphism refers to noticeable differences in morphology (like size, color, or shape) between males and females of the same species. It's a key characteristic studied in animal biology.
Analyzing Phyla for Sexual Dimorphism
- Cnidaria: Organisms like jellyfish and corals. They often exhibit radial symmetry and are typically hermaphroditic or reproduce asexually. Pronounced sexual dimorphism is generally absent.
- Porifera: Sponges lack distinct sexes and are usually hermaphroditic, meaning an individual can produce both sperm and eggs. Sexual dimorphism is not observed.
- Nemathelminthes: This phylum includes roundworms. Sexual dimorphism is a common feature. For instance, female roundworms are often larger and longer than the males, and males may have a distinct curved tail.
- Platyhelminthes: Flatworms, such as planarians and tapeworms. Many species in this group are hermaphroditic and possess both male and female reproductive organs. Distinct sexual dimorphism is not a defining characteristic.
Conclusion on Sexual Dimorphism
Based on the analysis, Nemathelminthes is the phylum among the options where sexual dimorphism is commonly observed and is a significant characteristic.
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