Question

Ecdysis is shedding of
A. Stratum corneum
B. Epidermis
C. Dermis
D. Stratum Malphigi

Answer 1

Hint: Ecdysis is seen in invertebrates whire the outer covering is shed off during growth. It is mostly seen in arthropods and they remain inactive during ecdysis.

Complete Answer:
Let us analyse the options to find the correct answer
Option A: Stratum corneum is the outermost skin or epidermal layer which provides a barrier between body and the external environment. It helps in the protection of underlying skin parts from infection and damage. It is made up of dead cells. The main protein present here is Keratin. This layer forms the exoskeleton of invertebrates which is removed during growth. Hence, this is the correct option.

Option B: Epidermis is the outer visible layer of skin which has 5 parts namely: stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum in the order of deepest to outermost. Hence, this is the incorrect option.

Option C: Dermis is the layer beneath and next to epidermis. It is not shedd off during Ecdysis. Hence. This is the incorrect option.

Option D: Stratum Malpighii is also called stratum basale. It is the deepest layer of epidermis which is made up of only 1 layer of cells. It can also include stratum spinosum. Hence, this is the incorrect option.

Thus, the correct answer is Option A) Stratum Corneum.

Note: The process of shedding of the stratum corneum or the cuticle is also called Moulting. The stratum corneum forms the exoskeleton which is quite rigid thus constraining the growth of invertebrates. Hence, ecdysis is necessary for the growth of limbs and other body parts.