Question

T.S. of stem of Cucurbita can be identified from the T.S. of sunflower stem by the presence of
A.Bicollateral vascular bundles
B.Conjoint vascular bundles
C.Scattered vascular bundles
D.Cambium in the vascular bundles

Answer 1

Cucurbita stem is an exceptional case of dicot stem. It has two strips of cambium, one patch of xylem and two patches of phloem.

Complete answer:
The vascular bundle in case of plants is composed of tissues to transport food, mineral to different parts of the plant. The stem of Cucurbita is having a wavy margin, there are distinct ridges and furrows found here. The vascular bundles are found to be arranged in two rings, one ring of smaller bundles against the ridges and one ring of larger bundles are present against the furrows. This central hollow cavity is formed because of disintegration of the pith. So, the correct answer is 'Bicollateral bundles vascular bundles'.

Hence the correct answer is OPTION(A)

Note: The vascular bundles where two phloem patches, one xylem strand and two strips of cambium are present on the same radius are known as bicollateral vascular bundles. The phloem is present towards the outer side is called outer phloem and on the inner side is called inner phloem. In between the xylem and phloem there are two cambium strips present. These types of vascular bundles are found in members of Cucurbitaceae and Solanaceae.