Biology Question on Anatomy of Flowering Plants

Question

Which one of the following plants has bicollateral vascular bundles in its stem?

Answer 1

Solution

In bicollateral vascular bundles, phloem patches remain on both sides of the xylem, The phloem present on the outer side of xylem as in collateral vascular bundle is called outer or external phloem. Phloem present on the inner side of xylem is called inner or internal phloem. This type of vascular bundle occurs mainly in the Family Cucurbitaceae. It also occurs in some members of Solanaceae, Convolvulaceae etc. These bundles are always open as the outer and inner patches of phloem are separated from the central xylem by two strips of cambium. Pumpkin (Cucurbita maxima) belongs to Cucurbitaceae family and has bicollateral vascular bundle in its stem.