Question

The number of fertile stamens in Ravenala madagascariensis is
A. Three
B. Four
C. Five
D. Six

Answer 1

Hint: Ravenala madagascariensis is a spermatophyte of family Sterlitziaceae. In these plants, flowers square measure trimerous like liliopsid (another name used synonymously for monocots).

Complete answer: Ravenala madagascariensis is also known as Traveller's Palm. This plant belongs to the Sterlitziaceae family. It basically has 6 stamens in 2 whorls of three (can be up to 16cm long) each in a direction opposite to that of tepals. The anthers are basifixed which means in this case anthers are attached to the base of the filament and are pointing away from the filament. Hence they are trimerous and have six stamens that square measure fertile.
Hence option D is correct.

Additional Information:
In this case of Ravenala madagascariensis, the inflorescence found is of compound cyme. The stem of Ravenala madagascariensis is aerial and woody. The leaves of this are simple and possess a strong petiole. The phyllotaxy is distinct (the arrangement of leaves is such that they are in two rows on the same side). Anthers are dithecous and they dehisce in vertical slits. Traveler’s palm isn't a real palm. Partly it's like a banana plant and partly a tree. Its long leaf stalks and deep inexperienced leaves tally those of the banana and extend out symmetrically from the trunk, sort of a big Chinese fan. The small white flowers, during a foot long inflorescence, square measure command in bracts. In these bracts and leaf folds, freshwater is collected. It’s this freshwater aggregation property of this tree, which may be consumed by thirsty travelers, that offers it the name traveler’s palm. The fruits square measure brown whereas the seeds square measure blue.

Note: These flowers, upon being pollinated, manufacture sensible blue seeds. In tropical and semitropical regions, the plant is widely cultivated for its distinctive habit and foliage. Because the plant grows older, it more and more loses all-time low or oldest leaves and divulges a durable gray trunk. Ruffed lemurs square measure a familiar insect of this plant, and given the scale and structure of the inflorescences, in addition, because of the lemur's property, the technique of feeding, and a long muzzle, this relationship is assumed to be coevolved.