Question

Innumerable vascular bundles, lack of cambium and lack of well demarcated pith is found in

• A. Sugarcane
• B. Sunflower
• C. Radish
• D. Pea

Answer 1

The correct option is A Sugarcane

In a monocotyledenous stem the vascular bundles are not arranged in a circle but are usually scattered throughout the ground tissue. There is no clearly defined pith as there is in many dicotyledonous species.
As in the dicots the xylem of the bundles is pre-orientated toward the middles of the stem. The vascular bundles of monocotylenous plants do not contain a layer of meristematic tissue (cambium) as the dicots do. Thus no new cells can be formed inside the vascular bundles of monocots and their vascular bundles are termed closed, whereas those of dicot plants are open. So, no annual rings in monocots as, there is no secondary growth.

Sugarcane belongs to monocots. Thus, option A is correct.

Sunflower, radish and pea belongs to dicots, whose vascular bundles have cambium and well demarcated pith.