Question

Assertion: In some leguminous plants, the leaf base is swollen.
Reason: The swollen leaf base is called pulvinus.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer 1

Hint: Trees, shrubs, and herbs belong to the Leguminosae family also known as leguminous plants. The fruit of leguminous plants is known to be dry, dehiscent and one chambered fruit and is called Legume or pod.

Complete answer:
Leguminous plants are distributed all over the world. The following are the salient features of leguminous plants.
Branched roots and taproot systems are found in these plants. Roots are marked with the presence of root nodules.
The stem of the leguminous plant is erect or climber
The flower is bisexual with pentamerous and zygomorphic symmetry. The presence of different petals is responsible for the zygomorphic symmetry.
The leaves of these plants are stipulated, simple, or pinnately compound. An odd number of leaves are observed here. The leaf base is known to be swollen in the subfamily of Leguminosae and is called pulvinate or pulvinus.
The common plants belonging to the Leguminosae family are pulses as food plants, fodder, fibers, and timber like Shisham. Some medicinal plants such as licorice also represent the leguminous plants.

Therefore, the correct option is (B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Note:
The swollen leaf base of leguminous plants is observed in the Sub – Family Fabaceae. This special character is found at the base of the leaf. The major benefit of the pulvinus is that it enables the growth-regulating movement. The distinguishing feature of the leguminous plants is the Corolla which has five petals. The petals are aligned in a butterfly shape.