Question

Keel is characteristic of the flowers of

• A. Bean
• B. Cassia
• C. Calotropis
• D. Gulmohur

Answer 1

The correct option is A

Bean

The correct option is option A.

Explanation for the correct option:

1. The keel is commonly found in the flowers of Papilionaceae plants such as beans, peas, and grains.
2. In bean five types of petals are present. The largest petal (standard) overlaps the two lateral petals (wings), which in turn overlap two smallest anterior petals, which are known as keel.
3. Below the wings, in the flowers of family Papilionaceae, two anterior petals come together to form a fused structure which is similar to the keel of a boat.
4. Garden beans and peas, clover, lupine, vetch, wisteria, and hay are among the family's most common plants, along with redbud.
5. As a result, Beans are the correct answer.

Explanation for the incorrect options:

Option B:

1. The genus Cassia belongs to the Caesalpinioideae subfamily of the Fabaceae family of legumes.
2. Species are frequently referred to as cassias.
3. Some species of the genus Cinnamomum of the family Lauraceae are also known by the common name "Cassia".

Option C:

1. Calotropis Procera (Aiton) dry and is a perennial shrub in the Asclepiadaceae subfamily of the Apocynaceae family (the milkweed family).
2. It is a xerophytic evergreen plant that often inhabits dry and semi-arid environments.
3. A plant with white flowers is called Calotropis Procera.
4. It is a tall shrub with thick, oblong leaves, yellowish-white bark, and purple or white blooms.

Option D:

1. A native of Madagascar, Delonix regia is a species of flowering plant belonging to the Caesalpinioideae subfamily of the Fabaceae bean family.
2. It is distinguished by its fern-like leaves and dramatic summertime display of orange-red blooms.
3. It is grown as an ornamental tree in many tropical regions of the world.
4. The zygomorphic flowers are perfectly complete and grouped in panicles.
5. The calyx contains five elongated, united green sepals.

Final answer: Keel is characteristic of the flowers of beans.