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The pyrimidines are single ring compounds with nitrogen in which positions of a 6-membered benzene ring?
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Consider the following statements and choose the correct answer: 1. In Oenothera type of monosporic embryo sac, the embryo develops from the micropylar megaspore of the tetrad 2. Antipodal cells are altogether absent in Oenothera type 3. The genus Trapa forms an 8-nucleate embryo sac of the Polygonurn type 4. Oenothera type of embryo sac development has been found to be a characteristic feature of the entire family Onagraceae