Differentiate between Phylum Platyhelminthes and Phylum Aschelminthes.

  • A
    Body shape: Platyhelminthes are dorso-ventrally flattened; Aschelminthes are circular in cross-section.
  • B
    Coelom: Both are acoelomate and pseudocoelomate respectively.
  • C
    Digestive system: Platyhelminthes have an incomplete digestive system; Aschelminthes have a complete digestive system.
  • D
    Excretion: Platyhelminthes use flame cells; Aschelminthes use a renette cell or excretory pore.

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Fill in the blanks marked in the classification table of $Vertebrata$ from the choices provided below with respect to $A, B, C, D, E$ and $F$ and choose the correct option:
$I$. Pisces
$II$. Osteichthyes
$III$. Agnatha
$IV$. Gnathostomata
$V$. Chondrichthyes
$VI$. Cyclostomata
$A - B - C - D - E - F$

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Select the correct statement.

Give the correct match in the following:
Column-$I$ Column-$II$
$(A)$ Flame Cells $(p)$ Sponges
$(B)$ Collar Cells $(q)$ Hydra
$(C)$ Stinging cells $(r)$ Planaria
$(s)$ Ascaris

In which of the following is external fertilization observed?

Which pair of animals are not included in mammals?

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