Question

If a flower is modified shoot, floral organs calyx, carolla, androecium and gynoecium are
A) Modified stem
B) Modified stem and leaves
C) Modified leaves only
D) Unknown modified organs.

Answer 1

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

Complete Answer:
- A flower is considered a modified shoot that is borne on thalamus. The thalamus shows four nodes with highly condensed internodes. These four nodes give rise to four whorls of the flower. So. Calyx, corolla, androecium and gynoecium are modified leaves.
- Calyx and corolla are accessory organs, while androecium and gynoecium are reproductive organs.
- Calyx is the outermost whorl of the flower, it is green, leaf-like and protects the flower in the bud stage.
- Corolla – They are brightly colored and they attract insects for pollination.
- Androecium is the male reproductive part. It is composed of stamens.
- Gynoecium is the female reproductive part of the flower.

The correct option is C modified leaves.

Note: Stems are modified to perform different functions. Underground stems of potato, ginger, turmeric, Zamikand, Colocasia are modified to store food in them.
- Leaves are modified into tendrils (for climbing, example in peas) and spines (for defense, example Cacti). Also fleshy leaves of onion and garlic stores food.
- Roots are also modified for storage of food and respiration. Tap roots of carrot, turnip and adventitious roots of sweet potato store food. Roots of Rhizophora called pneumatophores help in respiration.