Practice question

Psidium guajava guava of family Myrtaceae demonstrates epigynous floral organization where thalamus grows upwards enclosing ovary and fusing completely with its wall, other whorls sepals petals stamens appear inserted above ovary so ovary becomes inferior when sectioned. Superior ovary occurs in hypogynous families mustard and Hibiscus, half inferior perigynous in Saxifragaceae and Rosaceae intermediate. Inferior ovary leads to false berry fruit where thalamus plus ovary forms fleshy tissue crowned by persistent calyx lobes. Guava epigynous inferior ovary with axile placentation and numerous ovules typifies Myrtales evolutionary trend toward protection of ovules.