Question

In solanum nigrum, the gamopetalous corolla is
A.Rotate
B.Tubular
C.Campanulate
D.Globose

Answer 1

Corolla refers to the petals of the flower which is one of the whorls of the flower and it shows various modifications in its shape in different families of plants.

Complete answer:
Corolla is the second whorl of a flower, the first is the outer whorl calyx, the corolla is also known as the petal. The petals are mostly brightly colored to attract the insect to pollinate the flower.

Besides that corolla is also known to protect the inner whorls of the flowers which are also the reproductive parts of the flower that is the androecium and the gynoecium.
Solanum nigrum is the scientific name for the blackberry nightshade plant which is also known as European black nightshade and it belongs to the family Solanaceae and genus So Solanum.
Solanum nigrum shows a rotate shaped corolla which is a wheel-shaped corolla and it consists of several pleats and has small tubes.

Option A: So Solanum nigrum is European black nightshade that belongs to the family Solanaceae and this family mostly shows rotated corolla. Therefore, this is the correct option.

All other options are irrelevant.

Hence, the correct answer is option (A)

Note: There are a total of thirteen types of corolla based on their shape. The thirteen types are cruciform corolla, caryophyllaceous corolla, Rosaceous corolla, Tubular corolla, Rotate corolla, personate corolla, papilionaceous corolla, campanulate corolla, Infundibuliform corolla, Hypocrateriform corolla, urceolate corolla, ligulate corolla, and bilabiate corolla.