Biology : Human Health And Diseases

Q 10 / 15

UPSC CSE Prelims 2001

Consider the following statements

  1. 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?

EXPLANATION

Correct Option

Statement 1: Tapeworms (Phylum Platyhelminthes) are hermaphroditic organisms. They possess both male and female reproductive organs within the same individual, often in each proglottid, enabling self-fertilization.

Statement 2: Roundworms (Phylum Nematoda) are dioecious, meaning they have separate male and female individuals with distinct reproductive organs.

Statement 3: Filariasis, commonly known as Filaria, is a parasitic disease caused by filarial nematodes (roundworms), such as Wuchereria bancrofti. These parasites are transmitted to humans through mosquito bites.

Incorrect Options

Statement 4: Guinea-worm (Dracunculus medinensis) is a parasitic nematode, not an annelid. Annelids are segmented worms, including earthworms and leeches.

Option (a) is incorrect as it omits statement 3, which is a correct statement.

Option (c) is incorrect as it includes statement 4, which is an incorrect statement.

Option (d) is incorrect as it includes statement 4, which is an incorrect statement.

SOURCENCERT Class 11 Biology Chapter 4: Animal Kingdom, NCERT Class 12 Biology Chapter 8: Human Health and Disease