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Question

Position of protoxylem and protophloem in leaf respectively is
  1. Adaxial on both surfaces
  2. Adaxial and Abaxial
  3. Abaxial and Adaxial
  4. Abaxial on both surfaces

A
Adaxial and Abaxial
B
Abaxial and Adaxial
C
Adaxial on both surfaces
D
Abaxial on both surfaces
Solution
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Protoxylem is the first formed xylem and protophloem is the first formed phloem.
Adaxial is the upper surface whereas abaxial is the lower surface.
In a leaf, protoxylem is present on the upper side and protophloem is present on the lower side in a vascular bundle.
Hence, position of protoxylem is adaxial and position of protophloem is abaxial. So, the correct answer is 'Adaxial ad Abaxial'.

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