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Question
In a dorsiventral leaf, phloem is found in which of the following side?
In a dorsiventral leaf, phloem is found in which of the following side?
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Solution
The correct option is B Abaxial
In a dorsiventral leaf, each vein has a bundle sheath composed of single layer of compactly arranged barrel shaped parenchyma cells. The bundle sheath encloses both xylem and phloem. Xylem is found towards upper epidermis (adaxial) and phloem towards lower epidermis (abaxial). In the xylem, many protoxylem and metaxylem vessels are found. Protoxylem orients towards upper epidermis. Hence, the vascular bundle are described as conjoint and collateral with endarch xylem. The bundle sheath of the midrib vein is connected to the upper and the lower epidermal layers by many layers of collenchyma cells, representing bundle sheath extensions or hypodermal collenchyma.
Thus, the correct answer is option B.
In a dorsiventral leaf, each vein has a bundle sheath composed of single layer of compactly arranged barrel shaped parenchyma cells. The bundle sheath encloses both xylem and phloem. Xylem is found towards upper epidermis (adaxial) and phloem towards lower epidermis (abaxial). In the xylem, many protoxylem and metaxylem vessels are found. Protoxylem orients towards upper epidermis. Hence, the vascular bundle are described as conjoint and collateral with endarch xylem. The bundle sheath of the midrib vein is connected to the upper and the lower epidermal layers by many layers of collenchyma cells, representing bundle sheath extensions or hypodermal collenchyma.
Thus, the correct answer is option B.
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