FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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radially placed parenchymatous cells between vascular bundles
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longitudinally placed parenchymatous cells between vascular bundles
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laterally placed parenchymatous cells between vascular bundles
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obliquely placed parenchymatous cells between vascular bundles
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Detailed explanation-1: -Secondary medullary rays are formed by the vascular cambium and pass through the secondary xylem and phloem as radiating strips or bands in the horizontal direction. Both primary and secondary medullary rays help in radial conduction of food, water and minerals.
Detailed explanation-2: -In between the vascular bundles there are a few layers of radially placed parenchymatous cells, which constitute medullary rays. A large number of vascular bundles are arranged in a ring; the ‘ring’ arrangement of vascular bundles is a characteristic of dicot stem.
Detailed explanation-3: -These medullary rays are generally parenchymatous cells which later transform into xylem and phloem cells.
Detailed explanation-4: -In a dicot stem, the parenchymal strips which are found between the vascular bundles are known as medullary rays. They are also known as vascular rays or pith rays. The function of medullary rays is as follows, >They separate the primary phloem and xylem.