Question

Term apolysis was given by

• A. Vincent Wigglesworth
• B. A.D. Imms
• C. R.E. Snodgrass
• D. P.M. Jenkin and H.E. Hinton

Hint:

Apolysis = Separation (Physiological); Ecdysis = Shedding (Physical). Always credit Jenkin and Hinton for this distinction.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Molting (ecdysis) is the process by which an insect sheds its old exoskeleton to grow.
This process is divided into several physiological steps, the first of which involves the separation of the living epidermis from the old cuticle.
Detailed Explanation:
Apolysis is the initial stage of the molting cycle where the epidermal cells detach from the inner surface of the old endocuticle.
This creates a space (exuvial space) which is subsequently filled with molting fluid containing inactive enzymes.
The term "apolysis" was formally introduced by Jenkin and Hinton in 1966 to distinguish this physiological separation from the physical act of shedding the skin (ecdysis).
They argued that the true biological "new stage" begins at apolysis, not when the old skin is dropped.
Vincent Wigglesworth was a pioneer in hormonal control of molting (PTTH, Ecdysone, Juvenile Hormone).
R.E. Snodgrass was a master of insect anatomy and morphology.
A.D. Imms was a general taxonomist.

Step 2: Final Answer:
The term "apolysis" was coined by P.M. Jenkin and H.E. Hinton.