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B
Collateral and closed
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C
Collateral and open
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D
Bicollateral
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Solution
The correct option is D Collateral and open Pinus belongs to the family Pinaceaeof gymnosperm and pines are woody and monoecious plants. The stems of Pinus are similar in structure to the woody dicotyledons except that being a gymnosperm the xylem is made up only tracheids and no vessels. The vascular bundle of the Pinus stem is, therefore, collateral, endarch and open