Question

Which of the following hormones regulates growth and metamorphosis in insects?

• A. Brain hormone
• B. Juvenile hormone
• C. Prothoracicotrophic hormone
• D. Ecdysone

Answer 1

Answer: (B), (D)

Ecdysone
Juvenile hormone

• The process of growth and metamorphosis in insects is controlled by secretions of prothoracic glands and corpora allata which are ecdysone and juvenile hormone respectively.
  
• Ecdysone stimu­lates growth and shedding of the old cuticle of the larva and the new cuticle is formed beneath the old cuticle.
  
• The juvenile hormone keeps the larval cells active and also controls the qualitative changes in the body during metamorphosis.
  

So, the correct option is 'Juvenile hormone' and 'Ecdysone'.