question_answer

The following is a diagram of the just spawned frogs egg; with the parts labelled from A to E. Identify the parts and choose the correct option from those given below.

A)  A = cytoplasm, B = plasma membrane, C = vitelline membrane, D = yolk, E = jelly coat

B)  A = cytoplasm, B = vitelline membrane, C = plasma membrane, D = Yolk, E = Jelly coat

C)  A = yolk, B = plasma membrane, C = vitelline membrane, D = cytoplasm, E = jelly coat

D)  A = yolk, B = jelly coat, C = vitelline membrane, D = cytoplasm, E = plasma membrane

Correct Answer: A

Solution :

Frogs zygote is spherical and about 1.6 mm in diameter with a covering of vitelline membrane and three concentric layers of albuminous jelly. The roughly one half blackish brown animal hemisphere containing most of the cytoplasm and large nucleus is uppermost whereas the whitish vegetal hemisphere is lower most.