Describe the structure of ovule with the help of neat labeled diagram

Describe the structure of ovule with the help of neat labeled diagram
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Ans: Ovules are seen in flowering plants. In Gymnosperms they are exposed and in angiosperms they are enclosed.

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Typical ovule has a stalk known as Funiculus and ovule body. Body has diploid mass of tissue called as nucellus covered by one or two protective coverings called as integuments. The region where the body is in contact with the funiculus is called as Hilum. The narrow passage left uncovered by the integument is called as micropyle. Part of the funiculus which fuses on the lateral side of ovule body forming a ridge is called as raphe. Within the nucellus, the embryosac is embedded. The region of ovule where the nucellus, integuments and funicle unite is called as chalaza. The ovules may be unitegmic with single integument as in Asteraceae and Solanaceae, bitegmic with two integuments as in Monocots and Polypetalae and ategmic without integuments as in parasites such as Balanophora, Loranthus.  

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