Question

Corpora allata are removed from a nymph. It will_________________.
A)Remain as nymph for life
B)Become an adult
C)Change to next nymph immediately but will remain in that state
D)Die after some time

Answer 1

Hint: Ecdysone is a steroidal prohormone of the 20-hydroxyecdysone main insect molting receptor, which is secreted from the prothoracic glands. Insect molting hormones are usually called ecdysteroids (ecdysone and its homologues).

Complete answer:
The corpus allatum is an endocrine gland in insect physiology that expresses juvenile hormones; as such, it plays a key role in metamorphosis. Surgical removal of the corpora allata (allatectomy) at its next molt will cause an immature larva to pupate, leading to a miniature adult.

An insect egg hatches after an incomplete metamorphosis, and a tiny nymph comes out. Typically, the nymph behaves like an adult bee, but it is much smaller. Nymphs, before becoming adults, do not become pupae. The embryonic form of insects that mature by a system called hemimetabolous metamorphosis or incomplete metamorphosis is a nymph. It suggests that babies normally appear like adults, only in a smaller form. The embryonic stage of insects that develop by holometabolous metamorphosis or absolute metamorphosis is a larva. Insects with chewing mouthparts tear off and eat bits of host tissue. Via successive stages, development progresses. Eggs which hatch into an immature phase are laid by females. The bug develops as an adult after going through a sequence of juvenile stages.

Hence, the correct answer is option (B)

Note: The mechanism is called full metamorphosis if the immature insects and adults have separate forms, and the worm or grub is called larvae, like juvenile insects. The bug transforms into a pupa after the last larval instar.