Consider the following statements1. Tapeworm is a hermaphrodite.2. Round-worm has separate sexes.3. Filaria is caused by a nematode.4. Guinea-worm is an annelid. Which of these are correct?
✓ Correct answer: b) 1, 2 and 3
ExplanationStatement 1 is correct: Tapeworms, belonging to the class Cestoda are fascinating parasites with a unique reproductive strategy.Each segment of their body, called a proglottid, contains both male and female reproductive organs, making them hermaphroditic.This adaptation allows tapeworms to self-fertilize or cross-fertilize, ensuring reproductive success even in limited host environments.Their reproductive efficiency is one reason they thrive as internal parasites.Statement 2 is correct: Roundworms, or nematodes (phylum Nematoda), exhibit sexual dimorphism, meaning individuals are either male or female.Males are typically smaller and possess specialized structures like spicules for mating.This separation of sexes enhances genetic diversity, a critical factor for survival in diverse environments.Nematodes are one of the most abundant and diverse groups of animals on Earth, found in almost every ecosystem.UPSC GS Paper-I PYQs 634Statement 3 is correct: Filariasis is caused by parasitic nematodes like Wuchereria bancrofti and Brugia malayi, which are transmitted to humans via mo
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