Question

Fill in the blanks.

(a) Bilateral, dorsiventral symmetry is found in _____
(b) Worms causing disease elephantiasis is ____
(c) The open circulatory system is found in _____ where the coelomic cavity is filled with blood.
(d) ______ are known to have pseudocoelom.

• A. (a) Liver fluke (Fasciola hepatica)
  (b) Filarial worm (Wuchereria bancrofti)
  (c) Arthropods
  (d) Nematodes
• B. (a) Liver fluke (Fasciola hepatica)
  (b) Arthropods
  (c) Nematodes
  (d) Filarial worm (Wuchereria bancrofti)
• C. (a) Filarial worm(Fasciola hepatica)
  (b) Liver fluke (Wuchereria bancrofti)
  (c) Arthropods
  (d) Nematodes
• D. (a) Filarial worm (Wuchereria bancrofti)
  (b) Liver fluke (Fasciola hepatica)
  
  (c) Nematodes
  (d) Arthropods

Answer 1

The correct option is A (a) Liver fluke (Fasciola hepatica)

(b) Filarial worm (Wuchereria bancrofti)
(c) Arthropods
(d) Nematodes
Bilateral, dorsiventral symmetry is found in Liver fluke (Phylum Platyhelminthes).

Worm causing disease elephantiasis is Wuchereria bancrofti. Common name is filarial worm.

Open circulatory system is found in arthropods where coelomic cavity is filled with blood. Blood filled coelom is called as haemocoel.

Nematodes are known to have pseudocoelom. It is a false coelom.

Hence the correct option is A.