Question

Which one of the following is not true about monocotyledonae?

• A. Embryo has single cotyledon
• B. Leaves show parallel venation
• C. Flowers are generally trimerous
• D. Vascular bundles are conjoint, collateral and open

Answer 1

The correct option is D Vascular bundles are conjoint, collateral and open

In conjoint vascular bundles, xylem and phloem together form a bundle and are arranged in the same radius.The two sub-types are collateral and bicollateral.

In collateral, the xylem and phloem are present together on the same radius in such a manner that xylem lies inwards and the phloem is located outwards.

In the dicotyledonous stem, the cambium is located between xylem and phloem, such bundles are called open and when the cambium is absent, it is called closed (seen in monocotyledonous stems).

Thus the correct answer is option D.