Mention the relation of earthworm with human life.

  • A
    They are pests that destroy crops.
  • B
    They are known as friends of farmers because they make the soil porous.
  • C
    They are used as a primary source of food for humans.
  • D
    They have no significant relation to human life.

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Blood glands of $Pheretima$ take part in

Earthworm possesses how many pairs of hearts?

In earthworms,the septal nephridia are primarily associated with:

Match the following columns regarding the types of nephridia in earthworms:
Column-$I$ Column-$II$
$P$. Septal nephridia $I$. Enteronephric
$Q$. Integumentary nephridia $II$. Exonephric
$R$. Pharyngeal nephridia

How many pairs of lateral hearts are present in $Pheretima$ (in pairs)?

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