Question

The illustration below shows the effect of hormones on insect growth and development.

1. Name:
   1. the hormone K
   2. gland L that produces ecdysone hormone 
2. State the role of ecdysone hormone in the growth and development of insects. 
3.  
   1. Name process M 
   2. Account for the rapid increase in size of organisms immediately after moulting. 

Answer 1

1.  
   1. Juvenile (hormone)
   2. prothoracic (gland)
2. Ecdysone (hormone) causes metamorphosis; or causes the larval stage (of an insect to change/metamorphosize into pupa and pupa into adult.
3.   
   1. Complete Metamorphosis
   2. During moulting (the tough/hard impermeable) exoskeleton is shed; allowing the (soft permeable) larvae to take in air/water leading to rapid growth (which in turn results to increase in size of the organism).