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B
Solanum nigrum
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C
Polygonum
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D
Helianthus
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Solution
The correct option is DPolygonum
Orthotropous ovule is the simplest and primitive type of ovule. In this type of ovule, micropyle, chalaza and funiculus lie in one vertical plane. Example of plants with orthotropous ovules are, Polygonum, Piper nigrum, Piper betel and all gymnosperms.