Question

Monadelphous androecium occurs in ________.
A. Pea
B. Hibiscus
C. Brassica
D. Helianthus

Answer 1

Hint: The flower of this plant is commonly known as China rose. Flowers are found in different colours like red, pink, white, peach, yellow, or purple.

Complete Answer:
- Androecium is the male reproductive unit made up of stamens. A stamen has a long stalk called a filament. There is a cluster of microsporangia called anther at the tip of the filament. Androecium is also known as tarsal.
Many types of androecium are found in different flowers.
On the basis of cohesion, androecium is of four types: monadelphous, diadelphous, polyadelphous, and syngenesious.
(I) In monadelphous androecium, stamens are merged by their filament in one bundle with free anthers.
(II) In diadelphous androecium, filaments are merged into two bundles and the anthers remain free.
(III) In polyadelphous androecium, the filaments are merged into more than two bundles but anthers are free.
(IV) And in syngenesious androecium, anthers are merged but the filaments are free.
The androecium of pea plant is diadelphous as its filaments are merged into two bundles and the anthers are free.
The androecium of Hibiscus is monadelphous as its filaments are merged in one bundle and anthers are free.

Fig: Diagram of a Hibiscus flower

The androecium of Brassica is polyadelphous as its filaments are merged into more than two bundles and the anthers remain free.
The androecium of Helianthus is syngenesious as its five stamens are merged by their anthers.

Thus, the correct answer is option B i.e., Hibiscus.

Note: The Hibiscus flowers are large, trumpet-shaped, and conspicuous with five or more petals. The petals are broad from 4 to 18 cm. This plant is very hardy and versatile in tropical conditions.