Which one of the following is a matching set of the class and some of its main distinguishing features?

  • A
    Sporozoa - Infection by sporozoites,transmission by intermediate host and a contractile vacuole
  • B
    Trematoda - Well developed suckers,flat unsegmented body
  • C
    Arachnida - $3$ pairs of legs,chitinous exoskeleton and poisonous sting
  • D
    Insecta - Compound eyes,segmented body and nephridia

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Which of the following animals possesses an incomplete digestive system (lacking an anus)?

In which triploblastic animals is the coelom absent?

In which phylum do animals have a digestive tract that opens at only one end?

Which of the following is a free-living flatworm?

The characteristics of a tapeworm are:
$(A)$ Large,quadrate scolex,without rostellum and hooks
$(B)$ Primary host man,and secondary host cattle
$(C)$ Length $5$ to $10$ metres
Identify the tapeworm.

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