Question

Pappus is a modification of
a. Bracts
b. Bracteoles
c. Corolla
d. Calyx

Answer 1

Pappus, a hairy structure . Pappus consists of one or more dry scales or bristles. Sometimes the scales are joined along their margins to form a ring-like structure at the base of the ovary. It often assists in disposal of seeds during germination. This feature is found majorly in Asteraceae Family( Sonchus, Tridax).

Complete answer:
Let's study each option one by one

Option A:
Bracts are a modified form of leaf. It is commonly found at the base of the pedicel of a flower. They help in attracting insects which assists in pollination. They also protect the early bud. Thus, it is an incorrect option.

Option B:
Bracteole is a leaf-like structure that is often found between flowers and a bract. Thus, it is an incorrect option.

Option C:
Corolla is the second axillary whorl of a flower. It is made of petals. Petals are often brightly colored or have a pleasant fragrance to attract the pollinators. Thus, it is an incorrect option.

Option D:
Pappus is a hairy structure which is present at the base of the corolla. It is a modified form of the calyx. Pappus consists of one or more dry scales or bristles. Sometimes the scales are joined along their margins to form a ring-like structure at the base of the ovary. It helps in the disposal of seeds. It is mostly found in the Asteraceae family.
Hence, the correct answer is option (D).

Note: The dandelion pappus plays an important role in wind distribution of its seeds. By creating a separate vortex ring, the flight of the pappus is stabilized and more lift and pull is achieved. pappus also has the property of being able to change morphology in various ways in the presence of moisture to increase germination. Deformation can regulate the rate of abscission and, depending on favorable conditions, allow increased or decreased germination.