Each ovary in a cockroach is formed by a group of $8$ ovarian tubules or ovarioles,containing a chain of developing ova. Fill in the blank.

  • A
    $2$
  • B
    $4$
  • C
    $6$
  • D
    $8$

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Choose the correct answer from the options given below :

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The color of the hemolymph found in a cockroach is .....

Match column-$I$ with column-$II$ and choose the correct option.
Column $I$Column $II$
$A$. Periplaneta americana$I$. Hepatic caecae
$B$. $A$ ring of $6-8$ blind tubules$II$. Phylum Arthropoda
$C$. Vascular system$III$. Spiracles
$D$. $10$ pairs of small holes$IV$. Malpighian tubules
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