A) concentric and closed
B) concentric and open
C) conjoint and open
D) radial and open
Correct Answer: A
Solution :
Vascular bundles are conducting strand for conduction of food and minerals with water. They are made up of xylem and phloem. Types of vascular bundles : Radial vascular bundles : Phloem and xylem occur as distinct bundles present on alternate radii e.g., As in monocot and dicot root. Conjoint vascular bundles : Vascular bundles posses both xylem and phloem. (i)Collateral : Conjoint vascular bundles having phloem on the outside and xylem on the inner side on the same radius. Collateral vascular bundles are open, if a strip of intrafascicular cambium occurs between xylem and phloem e.g., Dicot stem and closed. If intrafascicular cambium is absent as in monocot stem. (ii)Bicollateral vascular bundles : Conjoint bundles having phloem both on the outer and inner sides of xylem, e.g., Cucurbita. These vascular bundles are always open type. (iii) Concentric : In these, one type of vascular tissue surrounds the other completely e.g., Dracaena, Yucca.
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