Question

Cucurbita stem is an exceptional dicot stem because it has.

• A. Bicollateral bundles
• B. Bicollateral bundles and several layered thick pericycle
• C. Bicollateral bundles and hollow centre
• D. Bicollateral bundles arranged in two alternate rings

Answer 1

The correct option is D Bicollateral bundles arranged in two alternate rings

Vascular bundles in which two phloem patches one xylem strand are present on the same radius are called Bicollateral vascualar bundles. In these bundles, phloem present towards outer side is called outer phloem and inner side is called inner phloem. Between xylem and phloem two cambium strips are present. These are found in Cucurbitaceae and Solanaceae members.

So, the correct answer is 'Bicollateral bundles arranged in two alternate rings'.