Question

From the features given below, identify the phylum A, B, C with the example.
$\begin{array}{ccc}\text{A}& \text{B}& \text{C}\\ \text{Bilaterally symmetrical}& \text{Bilaterally symmetrical}& \text{Bilaterally symmetrical}\\ \text{Acoelomate}& \text{Open circulatory system}& \text{Marine animals}\\ \text{Freeliving or parasitic}& \text{Reduced coelomic cavity}& \text{Notochord}\end{array}$

• A. A- Nematoda- Planaria
  B- Arthropoda- Prawns
  C- Vertebrata- Herdmania
• B. A- Platyhelminthes- Liverfluke
  B- Mollusca- Mussels
  C- Protochordata- Amphioxus
• C. A- Nematoda- Pinworm
  B- Mollusca- Snail
  C- Protochordata- Amphioxus
• D. A- Platyhelminthes- Tapeworm
  B- Arthropoda- Prawns
  C- Vertebrata- Herdmania

Answer 1

The correct option is B A- Platyhelminthes- Liverfluke

B- Mollusca- Mussels
C- Protochordata- Amphioxus
$\bullet$ Animals under phylum Platyhelminthes and Nematoda are bilaterally symmetrical and can be free living or parasitic. But, Platyhelminthes are acoelomate animals. E.g. Planaria, tapeworm, etc.
$\bullet$ Molluscs are bilaterally symmetrical and have an open circulatory system, like arthropods. But, molluscs have a reduced coelomic cavity. E.g. Mussels, snails, etc.
$\bullet$ Protochordates are exclusively marine animals. They are bilaterally symmetrical and possess notochord at some stages of their lives. E.g. Amphioxus, Herdmania, Balanoglossus, etc.