Subterranean cleistogamous flowers are found in
Commelina benghalensis, commonly known as the Benghal dayfloweris a perennial herb native to tropical Asia and Africa. These show cleistogamy. Cleistogamy or automatic self-pollination describes the trait of certain plants to propagate by using non-opening, self-pollinating flowers. Virtually all plants that produce cleistogamous flowers also produce hasmogamous ones. The principal advantage of cleistogamy is that it requires less plant resources to produce seeds because development of petals, nectar and large amounts of pollen are not required. This efficiency makes cleistogamy particularly useful for seed production on unfavorable sites or adverse conditions. The obvious disadvantage of cleistogamy is that self-fertilization occurs, which may suppress the creation of genetically superior plants.Therefore, the correct answer is option A.