Select the incorrect statement regarding diploblastic organization.

  • A
    It is found in Ctenophora and Cnidaria.
  • B
    An undifferentiated layer called mesoglea is present between the ectoderm and endoderm.
  • C
    Diploblastic animals exhibit tissue-level organization.
  • D
    All options are correct.

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Select the correct match for $X$ and $Y$:
Column $X$Column $Y$
$(1)$ Green gland$(P)$ Mollusca
$(2)$ Digestive tract with digestive glands$(Q)$ Arthropoda
$(3)$ Straight or coiled alimentary canal$(R)$ Hemichordata
$(4)$ Straight or $U$-shaped digestive tract$(S)$ Echinodermata

What is common between the trichocysts of $Paramecium$ and the nematocysts of $Hydra$?

Which invertebrate phylum is characterized by the ability of regeneration?

Which of the following sets of animals belongs to the same phylum?

Match the animal name in Column-$I$,its characteristic in Column-$II$,and its Phylum/Class in Column-$III$ correctly.
Column-$I$ (Animal) | Column-$II$ (Characteristic) | Column-$III$ (Phylum/Class)
$A$. Adamsia | $i$. Radial symmetry | $x$. Porifera
$B$. Petromyzon | $ii$. Ectoparasite | $y$. Cyclostomata
$C$. Ichthyophis | $iii$. Terrestrial | $z$. Reptilia
$D$. Limulus | $iv$. Body covered by chitinous exoskeleton | $w$. Pisces

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