Question

The colour of flower petals is due to the presence of
A. Xanthophyll
B. Carotenes
C. Phycoerythrin
D. Anthocyanin

Answer 1

Hint: In Angiosperms, a flower is the reproductive unit. It is meant for sexual reproduction. A typical flower consists of four different kinds of whorls arranged successively on the swollen end of the stalk or pedicel, called thalamus or receptacle. The four whorls are calyx, corolla, androecium and gynoecium.

Complete answer:
A flower which is comprised of both androecium and gynoecium, it is bisexual. A flower is unisexual if it is having either only stamens or only carpels.
The outermost whorl of the flower is calyx and the members are called sepals. Sepals are generally green and leaf like and protect the flower in the bud stage. The calyx are of two types; gamosepalous where the sepals are united or polysepalous where the sepals are free.
A group of petals produces corolla. Corolla may also be gamopetalous where the petals are united or polypetalous where the petals remain free. Corolla may be tubular, bell-shaped, funnel-shaped or wheel-shaped.
The most common pigments in flowers come in the form of anthocyanin. Anthocyanin are red or purple coloured water-soluble pigments present in the plant cell vacuoles. They are responsible for the colour of the flowers, fruits as well as leaves.
But, phycoerythrin is a photosynthetic pigment and it is found in red algae.
Carotenes and Xanthophyll both are carotenoid pigments of higher plants. They are accessory photosynthetic pigments.
The colour of flower petals is due to Anthocyanin.

So, the correct answer is option (D) Anthocyanin.

Note: The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation. Some of the main types of aestivation includes valvate, twisted, imbricate and vexillary.
The petals are generally bright in colour as to attract insects for pollination.