Question

A, B and C types of coelom are present in those animals which belong to the phyla having respective characteristics (i), (ii) and (iii). Select the correct option for characteristics (i – iii).

• A. (i) - Kidney like organ is present for excretion
  (ii) - Setae or parapodia are present for locomotion
  (iii) - Flame cells are present for excretion
• B. (i) - Nephridia are present for excretion
  (ii) - Special cells for offence/defence are present called cnidoblasts
  (iii) - The animals with jointed feet are present in this phylum
• C. (i) - Malpighian tubules are present for excretion
  (ii) - The segmented animals are present in this phylum
  (iii) - Autotomy is present in them
• D. (i) - Flame cells are present for excretion
  (ii) - Animals have false body cavity
  (iii) - Water vascular system is present

Answer 1

The correct option is D (i) - Flame cells are present for excretion

(ii) - Animals have false body cavity
(iii) - Water vascular system is present
A represents absence of coelom which is present in Acoelomates like flatworms belonging to phylum Platyhelminthes where flame cells are present for excretion.

B represents false body cavity which is present in Pseudocoelomates like that in animals of phylum Nematoda or Aschelminthes e.g. Roundworm.

C represents true coelom present in Coelomates. Animals belonging to phylum Annelida onwards uptill Phylum Chordata have true coelom.