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The mature female gamete / ovum is spherical in shape. the human ovum is almost free from yolk an is called alecithal. The human ovum loses its ability to fertilize approximately 24 hours after ovulation. Study the following diagram and answer the following.
(i) The acellular structure surrounding the ovum is called ___________ . (a) Perivitelline space (b) Zona pellucida (c) Zona reticulosa (d) corona radiata(ii) Identify 'X' in igven figure. (a) Perivitelline space (b) Zona pellucida (c) Zona reticulosa (d) corona radiata(iii) Choose correct option.

| X | Y | Z
(a) | Zona pellucida | Perivitelline space | Corona radiata
(b) | Corona radiata | Zona pellucida | Perivitelline space
(c) | Zona pellucida | Corona radiata | Perivitelline space
(d) | Perivitelline space | Corona radiata | Zona pellucida

(iv) The glandular layer surrounding ovum is called __________. (a) Zona pellucida (b) Corona radiata (c) Zona glomerulosa (d) Perivitelline space

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(i) (b) Zona pellucida (ii) (c) Zona pellucida (iii) (a) Zona Pellucida, corona radiata, Perivitelline space. (iv) (b) Corona radiata