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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