Question

in Hibiscus Rosa-Sinensis, there is an additional floral whorl known as
(a) Calyx
(b) Involucre
(c) Epicalyx
(d) Obdiplostemonous layer

Answer 1

Hint: Hibiscus rosa-sinensis has different local names in different regions, which are Chinese hibiscus, Hawaiian hibiscus, rose mallow, china rose, etc. They are a group of bracts that look like a calyx or bracteoles making a whorl exterior to the calyx.

Complete step by step answer:
An additional floral whorl made up by involucre which is seen outside to the whorl of the calyx is epicalyx. An involucre is a group of bracts that is present in a whorl under an inflorescence. Hibiscus rosa-sinensis is a shrub that is green all year and bushy, which grows 7 to 15ft tall and 1.5 to 5 meters.

So, the correct answer is ‘Epicalyx.’

Additional information:
- Due to the attractive color, size, and hues, Hibiscus rosa-sinensis is widely visited by butterflies and birds. Papillio humerus is the largest and rare butterfly that is famous for having nectar from hibiscus.
- Hibiscus rosa-sinensis is known to have a genetic condition known as Polyploidy where there are more than two full sets of chromosomes. This feature also lets florists cross and recross to form new varieties that have different colors.
- Hibiscus rosa-sinensis is the national flower of Malaysia, where it is called 'Burga Raya' and it was officially declared by the Malaysian government on 28 July 1960.

Note:
- In the Malay language 'bunga Raya' means 'great flower' and it is also printed on the currency of Malaysia.
- Hibiscus rosa-sinensis are edible flowers, commonly used as dressings on salads, and used generally to make oils for hair.
- Hibiscus rosa-sinensis cannot grow below the temperature of 10 degrees due to which they are prominent in tropical and subtropical regions, mostly as an ornamental plant.