Question

hibiscus not bears fruits even through androecium and gynoecium present in it why.?

Answer 1

All flowering plants produce some type of structure that contains and protects the seeds. Fleshy fruit are large and well known but a botanist calls grain, nut and bean pods fruit because they are the ripened, seed bearing ovary of the plant. Some fruit are dry pods or capsules once mature so they can split and drop out winged seeds to float away or they may shed hooked seeds to hitch rides on fur. Nuts in the rainforest may float away on water currents. Different fruit types just offer alternate methods of dispersing the seeds. 

Hibiscus do produce what a botanist considers a fruit just not a soft fleshy fruit like the apple. The rose has a hip as their fruit that contains the seeds known as achenes. The rose hip is traditionally collected and used to make jelly or tea