In cockroach, the ootheca is formed by the secretion of

phallic gland

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collaterial gland

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mushroom gland

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conglobate gland

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Solution

The correct option is C collaterial gland
Collaterial glands are present in female cockroach as part of reproductive system. These glands are branched tubular glands opening independently on the dorsal side of the genital chamber. The secretion produced by these glands forms the oothecal case of ootheca.

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