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  4. Generally, a monocot stem bears vascular bundles

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Q. Generally, a monocot stem bears vascular bundles

BHUBHU 2002

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 :
(a) Radial vascular bundles : Phloem and xylem occur as distinct bundles present on alternate radii e.g., As in monocot and dicot root.
(b) 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.