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Question
Vascular bundles are found scattered in ground tissue in
Vascular bundles are found scattered in ground tissue in
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Solution
The correct option is A Maize stem
Vascular bundles of monocot stem - They are found irregularly scattered in the ground tissue. Towards the periphery, the bundles are smaller in size while towards the centre, they are larger in size. The smaller bundles are younger, while the larger ones are older. Hence, the arrangement is described as centrifugal. Each vascular bundle has a covering called as bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence, the vascular bundles are described as conjoint, collateral and closed.
In the xylem, there are two metaxylem and two protoxylem vessels arranged in the shape of Y. The lower protoxylem vessel is non-functional and remains as a water filled cavity called as lisigenous cavity or protoxylem cavity. Xylem is described as endarch.
In the phloem, only sieve tubes, companion cells and phloem fibres are present. Phloem parenchyma is absent. Scattered vascular bundles are present in only monocot stem.
Thus, the correct answer is option A.
Vascular bundles of monocot stem - They are found irregularly scattered in the ground tissue. Towards the periphery, the bundles are smaller in size while towards the centre, they are larger in size. The smaller bundles are younger, while the larger ones are older. Hence, the arrangement is described as centrifugal. Each vascular bundle has a covering called as bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence, the vascular bundles are described as conjoint, collateral and closed.
In the xylem, there are two metaxylem and two protoxylem vessels arranged in the shape of Y. The lower protoxylem vessel is non-functional and remains as a water filled cavity called as lisigenous cavity or protoxylem cavity. Xylem is described as endarch.
In the phloem, only sieve tubes, companion cells and phloem fibres are present. Phloem parenchyma is absent. Scattered vascular bundles are present in only monocot stem.
Thus, the correct answer is option A.
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