Question

The above figure shows the diagram of the just spawned frog's 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

Answer 1

The correct option is A A - Cytoplasm, B - Plasma membrane, C - Vitelline membrane, D - Yolk, E - Jelly coat

The ova are released from the ovary in the primary oocyte stage. The ovum is spherical and measures 1.75 mm in diameter. It remains surrounded by a vitelline membrane (here, labelling C) and many layers called the tertiary egg membranes of adhesive jelly, also called jelly coat (here, labelling E). Underlying the vitelline membrane is the plasma membrane (here, labelling B). There is highly viscous or gel-like peripheral layer of cytoplasm (here, labelling A). The inner cytoplasm of the ovum contains a large germinal vesicle or nucleus near the animal pole and few yolk granules or yolk sac (here, labelling D).
So, the correct answer is option A.