Question

Adhesion in a flower is
A) Union of dissimilar parts
B) Union of similar parts
C) Both (A) and (B)
D) None of the above

Answer 1

Hint:-A flower has vegetative parts and reproductive parts. The reproductive parts take part in the formation of a zygote. The male reproductive part is called the androecium and the female reproductive part is called the gynoecium. Apart from that, the flower has a calyx and corolla. The primary function of a flower is to partake in the sexual reproduction of plants.

Complete Answer:-
The calyx, corolla, androecium and gynoecium are the four whorls of a plant. When all four whorls are present, the flower is considered complete. When one or more whorls are absent, the flower is deemed incomplete.
The calyx is a collection of sepals. It is the outermost whorl. Corolla is the collection of petals. This whorl comes after the calyx. A collection of stamens is called the androecium and it is the whorl that comes after corolla. The gynoecium is the final whorl and it consists of one or more pistils. In flowering plants (angiosperms), sometimes two or more whorls fuse together. This is called adnation or adhesion. Like in certain flowers, stamens can fuse with the petals. In certain flowers, the sepals and the petals cannot be differentiated. They are together called tepals. However, this is not an example of adnation. When the tepal is green in color, it is called sepaloid and when it has bright colors, it is called a petaloid.
Thus, the right option is A.

Note:- Connation is the exact opposite of adnation. Here, similar whorls or parts of a whorl fuse together. This condition is more commonly observed. A calyx tube is formed when sepals fuse together. This is also called synsepalous. The fusion of petals is called sympetalous. The same way carpels fused together are called syncarpous (female reproductive part).